阅读说明：本技术 珐琅贵金属饰品的制备方法及该方法制备的饰品 (Preparation method of enamel precious metal ornament and ornament prepared by method ) 是由 郑焕坚 于 2021-08-25 设计创作，主要内容包括：本发明实施例涉及珐琅饰品技术领域,公开了一种珐琅贵金属饰品的制备方法及该方法所制备的饰品,该方法包括：制备镂空贵金属基架；制备金属板：对金属板上与镂空贵金属基架的镂空部相对应的位置进行加工处理以获得具有图案纹理的凹槽；定位固定：将镂空贵金属基架水平放置于金属板的顶部,将镂空部与凹槽对准后,用夹具进行固定；填釉：将含有聚丙烯酸钠的珐琅低温釉料填充入镂空部和凹槽内；烧制：将填充有珐琅低温釉料的镂空贵金属基架和金属板于260-300℃烧制5-10min后取出,用已预热到200℃的硅酸铝纤维筒罩住,自然冷却；打磨处理：去除金属板,对烧制有珐琅的镂空贵金属基架进行打磨抛光。通过上述方式解决现有工艺复杂、成品质量差的问题。(The embodiment of the invention relates to the technical field of enamel ornaments, and discloses a preparation method of an enamel precious metal ornament and the ornament prepared by the method, wherein the method comprises the following steps: preparing a hollowed-out noble metal base; preparing a metal plate: processing the position, corresponding to the hollowed-out part of the hollowed-out noble metal base, on the metal plate to obtain a groove with pattern textures; positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and fixing by using a clamp; filling glaze: filling enamel low-temperature glaze containing sodium polyacrylate into the hollow part and the groove; firing: firing the hollow precious metal base frame and the metal plate filled with the enamel low-temperature glaze at the temperature of 260-300 ℃ for 5-10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling; polishing treatment: and removing the metal plate, and polishing the hollow precious metal substrate fired with enamel. The problems of complex process and poor finished product quality in the prior art are solved through the mode.)

1. A preparation method of an enamel precious metal ornament is characterized by comprising the following steps:

preparing a hollowed-out noble metal base;

preparing a metal plate: processing the position, corresponding to the hollowed-out part of the hollowed-out noble metal base, on the metal plate according to the designed enamel pattern to obtain a groove with pattern texture;

positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

filling glaze: filling enamel low-temperature glaze containing sodium polyacrylate into the hollow part and the groove;

firing: firing the hollow precious metal base frame filled with the enamel low-temperature glaze and the metal plate at the temperature of 260-300 ℃ for 5-10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

polishing treatment: and removing the metal plate, and grinding and polishing the hollow precious metal base frame with the enamel.

2. The method according to claim 1, wherein the metal plate has an expansion coefficient larger than that of the noble metal hollowed-out base.

3. The method of claim 1, further comprising, after the step of preparing the metal plate: spraying the outer surface of the metal plate with a mass ratio of 9: 1 and polyaryl organic silicon resin to carry out film sealing treatment.

4. The method of claim 3, wherein the sealing process comprises the steps of:

heating the metal plate to 60-70 ℃;

and (3) mixing the components in a mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of the metal plate through an atomizer;

and cooling to room temperature to form a sealing film on the outer surface of the metal plate.

5. The method according to claim 1, wherein the enamel low-temperature glaze comprises the following components in parts by mass: 40-50 parts of albite; 20-30 parts of tremolite; 5-15 parts of borax; 10-30 parts of volcanic rock and 10-20 parts of talcum; 0.5-4 parts of strontium carbonate; 10-15 parts of magnesium carbonate; 5-15 parts of zinc oxide; 2-8 parts of a coloring agent.

6. The method according to claim 5, wherein said enamel low temperature glaze is prepared by a method comprising:

weighing albite, tremolite, borax, volcanic rock, talc, strontium carbonate, magnesium carbonate and zinc oxide according to a formula, uniformly mixing, crushing and sieving;

calcining the sieved mixture at 1000-1200 ℃ for 5-8 hours;

adding a coloring agent according to the formula amount when the oil is cooled to 600-700 ℃, continuously heating to 800-900 ℃, and continuously heating for 3-5 hours;

naturally cooling to below 100 ℃, and adding water accounting for 35-50% of the total mass of the raw materials for grinding.

7. The method as claimed in any one of claims 1 to 6, wherein the mass of the sodium polyacrylate is 0.04 to 0.06% of the mass of the low-temperature glaze, and the viscosity of the sodium polyacrylate is 10000-15000 mPa-s.

8. The method according to any one of claims 1 to 6, wherein the hollowed-out noble metal substrate has a thickness of 2 to 8 mm.

9. The method according to any one of claims 1 to 6, wherein after said step of preparing a hollowed-out noble metal substrate, said hollowed-out noble metal substrate is subjected to acid pickling, comprising:

mixing hydrochloric acid and water according to the mixing ratio of 10: 100 preparing a dilute hydrochloric acid solution;

and (3) putting the hollow precious metal base frame into the dilute hydrochloric acid solution, soaking and pickling for 20-30min, and then washing with clear water and drying.

10. An enamel precious metal decoration, characterized in that it is obtained by a method according to any one of claims 1 to 9.

Technical Field

The embodiment of the invention relates to the technical field of enamel precious metal ornaments, in particular to a preparation method of an enamel precious metal ornament and an ornament prepared by the method.

Background

The hollow-out enamel ornament in the enamel noble metal ornament is characterized in that the enamel is flexibly matched with a noble metal blank body, the high end of the noble metal can be more shown through rich colors of the enamel, and the enamel has unique luster and transparency similar to gems and is favored by a plurality of consumers.

At present, in order to enable a glaze to be more firmly filled and fixed in a hollow part of an enamel ornament, a large amount of radix astragali powder needs to be added into the glaze in order to increase the viscous force of the glaze in a process of filling the glaze by virtue of point blue, in such a way, in a firing process, the radix astragali powder can generate a large amount of gas to cause a glaze layer to generate bubble holes, and the radix astragali powder in the glaze layer can be partially carbonized to cause black and brown spots in the glaze layer, so that the brightness and the appearance effect of a product are influenced, and the quality of a finished product is poor. In addition, the hollow part needs to be subjected to segmented or layered glaze filling firing, so that the blank is easily oxidized at high temperature, the unfired glaze filling firing part needs to be polished first to further perform glaze filling firing, and the processes of polishing, firing and the like need to be repeated, so that the process is complex and complicated.

Disclosure of Invention

In view of the above problems, the embodiment of the invention provides a preparation method of an enamel precious metal ornament and an ornament prepared by the method, and solves the problems of complex process and poor finished product quality in the prior art.

According to an aspect of an embodiment of the present invention, there is provided a method for preparing an enamel precious metal decoration, including: preparing a hollowed-out noble metal base; preparing a metal plate: processing the position, corresponding to the hollowed-out part of the hollowed-out noble metal base, on the metal plate according to the designed enamel pattern to obtain a groove with pattern texture; positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and fixing the hollowed precious metal base frame and the metal plate by using a clamp; filling glaze: filling enamel low-temperature glaze containing sodium polyacrylate into the hollow part and the groove; firing: firing the hollow precious metal base frame filled with the enamel low-temperature glaze and the metal plate at the temperature of 260-300 ℃ for 5-10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling; polishing treatment: and removing the metal plate, and grinding and polishing the hollow precious metal base frame with the enamel.

In an optional mode, the expansion coefficient of the metal plate is larger than that of the hollowed-out noble metal substrate.

In an alternative mode, after the step of preparing the metal plate, the method further includes: spraying the outer surface of the metal plate with a mass ratio of 9: 1 and polyaryl organic silicon resin to carry out film sealing treatment.

In an alternative mode, the sealing film treatment includes the following steps: heating the metal plate to 60-70 ℃; and (3) mixing the components in a mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of the metal plate through an atomizer; and cooling to room temperature to form a sealing film on the outer surface of the metal plate.

In an optional mode, the enamel low-temperature glaze comprises the following components in parts by mass: 40-50 parts of albite; 20-30 parts of tremolite; 5-15 parts of borax; 10-30 parts of volcanic rock and 10-20 parts of talcum; 0.5-4 parts of strontium carbonate; 10-15 parts of magnesium carbonate; 5-15 parts of zinc oxide; 2-8 parts of a coloring agent.

In an alternative form, the method of preparing the enamel low temperature glaze comprises: weighing albite, tremolite, borax, volcanic rock, talc, strontium carbonate, magnesium carbonate and zinc oxide according to a formula, uniformly mixing, crushing and sieving; calcining the sieved mixture at 1000-1200 ℃ for 5-8 hours; adding a coloring agent according to the formula amount when the oil is cooled to 600-700 ℃, continuously heating to 800-900 ℃, and continuously heating for 3-5 hours; naturally cooling to below 100 ℃, and adding water accounting for 35-50% of the total mass of the raw materials for grinding.

In an alternative mode, the mass of the sodium polyacrylate accounts for 0.04-0.06% of the mass of the low-temperature glaze, and the viscosity of the sodium polyacrylate is 10000-15000mPa & s.

In an optional mode, the thickness of the hollowed-out noble metal base is 2-8 mm.

In an alternative mode, after the step of preparing the hollowed-out noble metal substrate, pickling the hollowed-out noble metal substrate includes: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 preparing a dilute hydrochloric acid solution; and (3) putting the hollow precious metal base frame into the dilute hydrochloric acid solution, soaking and pickling for 20-30min, and then washing with clear water and drying.

According to another aspect of embodiments of the present invention, there is provided an enamel precious metal decoration obtained by the above method.

According to the embodiment of the application, the groove with the pattern texture is processed at the position, corresponding to the hollowed-out part of the hollowed-out precious metal base frame, of the metal plate, so that when glaze is filled, the metal plate can support low-temperature glaze of enamel filled in the hollowed-out part, and compared with the traditional mode that the glaze is directly filled in the hollowed-out part or a foil is adopted for false support, the mode can be used for firing at one time, layered or segmented firing is not needed, the process is simple and convenient, and the pattern texture on the groove can endow the enamel with the pattern texture with a prominent three-dimensional effect after firing; (ii) a

The sodium polyacrylate is added into the enamel low-temperature glaze, the viscosity of the enamel low-temperature glaze can be improved by using a small amount of sodium polyacrylate, so that the enamel low-temperature glaze can be better bonded with the hollowed metal base frame, compared with the traditional method of adopting astragalus powder, the method has the advantages of less sodium polyacrylate consumption, high viscosity, no problem of influencing the color of the enamel, such as air holes or spots and the like after firing, less bubbles and impurities in the finished product, stable glaze layer, difficult cracking and collapse, high finished product quality, simplicity and convenience in operation and contribution to improving the production efficiency; meanwhile, the enamel low-temperature glaze can be fired under the low-temperature condition, so that the fired enamel layer has a richer color presentation effect.

The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and the embodiments of the present invention can be implemented according to the content of the description in order to make the technical means of the embodiments of the present invention more clearly understood, and the detailed description of the present invention is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present invention more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic flow chart illustrating a method for preparing precious metal enamel according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating a method of making precious enamel metal according to some embodiments of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below. It should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for preparing precious enamel metal according to an embodiment of the present invention, where the method for preparing precious enamel metal includes the following steps:

step S1: preparing a hollowed noble metal base: the hollow precious metal base frame is prepared by a forging and casting molding mode.

Step S2: preparing a metal plate: according to the designed enamel pattern, the position, corresponding to the hollow part of the hollow metal base frame, on the metal plate is processed in a stamping mode, a cutting mode, a carving mode and the like so as to obtain a groove with pattern textures.

Step S3: positioning and fixing: and horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp.

Step S4: filling glaze: filling enamel low-temperature glaze containing sodium polyacrylate into the groove of the hollowed-out part of the hollowed-out noble metal base and the metal plate.

Step S5: firing: firing the hollow precious metal base frame and the metal plate filled with the enamel low-temperature glaze at the temperature of 260-300 ℃ for 5-10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S6: polishing treatment: and removing the metal plate, and polishing the hollow precious metal substrate fired with enamel.

In step S1, the material for preparing the hollowed-out noble metal substrate may be one of gold, silver, platinum and palladium or an alloy of any combination thereof.

After the step S1 of preparing the hollowed-out noble metal substrate, further, the hollowed-out noble metal substrate obtained by the preparation may be subjected to an acid washing process, where the acid washing process includes the following steps:

mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

and (3) putting the hollow precious metal base frame into dilute hydrochloric acid pickling solution for soaking and pickling for 20-30min, then washing with clear water and drying.

After acid washing treatment, impurities and oxides remained on the surface of the hollowed-out noble metal base after forging and casting forming can be effectively removed, so that the enamel low-temperature glaze can be better attached to the hollowed-out noble metal base. The blending proportion is 10: the acid washing of the dilute hydrochloric acid solution of 100 can be carried out at room temperature, the acid washing speed is high, the effect is good, residues after acid washing are easily removed by water washing, and the production and preparation efficiency is improved.

After the step S2 of preparing the metal plate, before the step S3 of positioning and fixing, the surface of the metal plate is sprayed with a spray coating having a mass ratio of 9: 1 and polyaryl organic silicon resin to carry out film sealing treatment.

The film sealing treatment comprises the following steps:

heating the metal plate to 60-70 ℃;

taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of the metal plate through an atomizer;

and cooling to room temperature to form a sealing film on the outer surface of the metal plate.

The anti-sticking kettle agent can be an HG-11A type efficient anti-sticking kettle agent, has an excellent anti-sticking effect, and is firm in anti-sticking coating and long in oxidation resistance time.

The polyaryl silicone resin is a copolymer containing only phenyl in a siloxane chain, and has excellent performances such as high heat resistance, strong oxidation resistance and the like. The polyarylsilicone resin plastic sheet is heated to 400 ℃ or 500 ℃ in air, and the phenyl does not fall off from the silicon after hours. The organic silicon monomer with three functional groups (phenyl trichlorosilane) is adopted, and after hydrolysis rearrangement, the trapezoidal polymer-the all-phenyl silicone resin is formed, and has higher heat resistance than common resin.

The metal base plate is subjected to film sealing treatment, so that a layer of sealing film is formed on the outer surface of the metal base plate, and after the hollow precious metal base frame and the metal plate are filled with glaze and fired, the metal plate is not bonded with enamel, so that the metal plate can be separated from the hollow precious metal base frame fired with the enamel. Meanwhile, the mass ratio of the anti-sticking kettle agent to the polyaryl organic silicon resin is set to be 9: 1, the sealing film formed after spraying has better anti-sticking and high temperature resistance.

The expansion coefficient of the metal plate is larger than that of the hollowed-out noble metal base. The larger the expansion coefficient of the metal plate is, the more convenient the metal plate is to be separated from the enamel after being fired and cooled, namely the metal plate is separated from the enamel low-temperature glaze after being fired and cooled.

Preferably, the metal plate may be a neodymium iron boron magnet plate having a thermal expansion coefficient of 4X 10-6.

In the step of preparing a metal plate S2, the prepared metal plate may have a thickness of 2 to 8 mm. During preparation of a traditional hollowed-out enamel ornament, a foil is usually adhered to the bottom of the hollowed-out part, but the foil is thin and easy to deform, and is easy to adhere to a fired and cooled enamel glaze, so that the appearance of enamel is changed, and the quality of a finished product is affected.

The metal plate with the thickness of 2-8mm is adopted, so that the structural strength of the metal plate is improved, the metal plate is not deformed to influence the appearance of the fired enamel, meanwhile, the metal plate is provided with enough thickness, a groove with pattern textures is formed in the position corresponding to the hollow-out part, the enamel low-temperature glaze filled in the groove can form the enamel with the pattern texture appearance effect after being fired, and the enamel has a prominent three-dimensional effect.

In the glaze filling step S4, the mass of the sodium polyacrylate accounts for 0.04-0.06% of the mass of the low-temperature glaze, and the viscosity of the sodium polyacrylate is 10000-15000mPa · S.

The enamel low-temperature glaze can be fired in a low-temperature environment, and after the firing, the enamel low-temperature glaze can be firmly bonded with the hollowed noble metal substrate. Compared with the traditional mode of adopting the astragalus powder, the mode has the advantages of less sodium polyacrylate consumption, good thickening effect and no influence on the texture and color of the enamel low-temperature glaze.

The mass of the sodium polyacrylate accounts for 0.04-0.06% of the mass of the low-temperature glaze, and the viscosity of the sodium polyacrylate is within the numerical range of 10000-15000 mPa.s, so that the overall viscosity effect of the low-temperature glaze containing the sodium polyacrylate can be further improved.

In the glaze filling step S4, the enamel low-temperature glaze comprises the following components in parts by mass: 40-50 parts of albite; 20-30 parts of tremolite; 5-15 parts of borax; 10-30 parts of volcanic rock and 10-20 parts of talcum; 0.5-4 parts of strontium carbonate; 10-15 parts of magnesium carbonate; 5-15 parts of zinc oxide; 2-8 parts of a coloring agent.

Wherein, the colorant comprises one of chromium oxide, cobalt oxide, zirconium oxide, copper oxide, vanadium oxide, phthalocyanine blue, manganese oxide, benzidine yellow G and permanent orange G or any combination thereof.

The preparation method of the low-temperature glaze comprises the following steps:

taking the following raw materials according to the formula: uniformly mixing albite, tremolite, borax, volcanic rock, talc, strontium carbonate, magnesium carbonate and zinc oxide, crushing and sieving;

calcining the sieved mixture in a kiln for 5-8 hours at 1000-1200 ℃;

cooling the calcined mixture to 600-700 ℃, adding the colorant according to the formula amount, heating to 800-900 ℃, and continuing for 3-5 hours;

cooling the natural oil to below 100 ℃, adding water accounting for 35-50% of the weight of the raw materials, and grinding the mixture by a ball mill to obtain the enamel low-temperature glaze.

The embodiment of the application can realize the following beneficial effects:

the groove with the pattern texture is processed on the metal plate at the position corresponding to the hollowed-out part, so that when glaze is filled, the metal plate can support low-temperature glaze filled in the hollowed-out part, and compared with the traditional mode of directly filling the glaze in the hollowed-out part or adopting a foil piece to perform false support, the mode can be used for firing at one time without layering or segmenting firing, the process is simple and convenient, and the pattern texture on the groove can endow the enamel with the pattern texture with a prominent three-dimensional effect after firing; meanwhile, the metal plate has good structural strength and is not easy to deform, and the problem that the appearance of enamel is influenced due to deformation or adhesion with the enamel during firing is solved;

by adding the sodium polyacrylate in the enamel low-temperature glaze, the viscosity of the enamel low-temperature glaze can be improved by using a small amount of sodium polyacrylate, so that the enamel low-temperature glaze can be better bonded with the hollow metal base frame. Compared with the traditional method of adopting the astragalus powder, the method has the advantages that the using amount of sodium polyacrylate is small, the viscosity is high, the problem that the color and luster of the enamel are affected by air holes or spots and the like after firing is avoided, bubbles and impurities in a finished product are few, a glaze layer is stable and is not easy to crack and collapse, and meanwhile, the enamel low-temperature glaze material can be fired under the low-temperature condition, so that the fired enamel layer has a richer color presenting effect, the quality of the finished product is good, the process operation is simple and convenient, and the production efficiency is improved;

the hollow precious metal base frame can be prepared by casting molding, the traditional process steps of wire inlay, welding wires and the like are avoided, and for small-size enamel precious metal ornaments, the operation is simple, and the yield of products is increased.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The present invention is further described in detail with reference to the following embodiments, referring to fig. 2 in combination with tables 1 and 2, wherein fig. 2 shows a flow chart of a method for preparing precious metal enamel according to some embodiments of the present invention.

Table 1 shows the raw material composition of the enamel low-temperature glaze in each embodiment.

Table 2 lists the components of the colorants in each of the specific examples.

Example 1

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame by a forging and casting molding mode, wherein the hollowed noble metal base frame is made of gold;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 20min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 2 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 60 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 40 parts of albite, 20 parts of tremolite, 5 parts of borax, 10 parts of volcanic rock, 10 parts of talc, 0.5 part of strontium carbonate, 10 parts of magnesium carbonate and 5 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln for 5 hours at 1000 ℃;

step S603: cooling the calcined mixture to 600 ℃, adding 2 parts of colorant (the colorant is chromium oxide), heating to 800 ℃, and keeping for 3 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 35 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 10000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.04% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal base and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 260 ℃ for 5min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 2

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame in a forging and casting molding mode, wherein the hollowed noble metal base frame is made of silver;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 30min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 8 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 70 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 50 parts of albite, 30 parts of tremolite, 15 parts of borax, 30 parts of volcanic rock, 20 parts of talc, 4 parts of strontium carbonate, 15 parts of magnesium carbonate and 15 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln for 8 hours at 1200 ℃;

step S603: cooling the calcined mixture to 700 ℃, adding 8 parts of colorant (the colorant is cobalt oxide), heating to 900 ℃, and keeping for 5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 50 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with the viscosity of 15000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.06% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollowed precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 300 ℃ for 10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 3

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame in a forging and casting molding mode, wherein the hollowed noble metal base frame is made of platinum;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 25min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 5 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 65 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 45 parts of albite, 25 parts of tremolite, 10 parts of borax, 20 parts of volcanic rock, 15 parts of talc, 2.2 parts of strontium carbonate, 12 parts of magnesium carbonate and 10 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1100 ℃ for 6.5 hours;

step S603: cooling the calcined mixture to 650 ℃, adding 5 parts of colorant (the colorant is zirconia), heating to 850 ℃, and keeping for 4 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 42.5 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 11000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.05% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal base and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 280 ℃ for 7.5min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 4

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame in a forging and casting molding mode, wherein the hollowed noble metal base frame is made of palladium;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 22min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 3 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 62 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 42 parts of albite, 22 parts of tremolite, 6 parts of borax, 15 parts of volcanic rock, 18 parts of talc, 1 part of strontium carbonate, 13 parts of magnesium carbonate and 8 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1150 ℃ for 6 hours;

step S603: cooling the calcined mixture to 630 ℃, adding 4 parts of colorant (the colorant is copper oxide), heating to 810 ℃, and keeping for 3.5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 37 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 14000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.04% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 270 ℃ for 6min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 5

Step S1: preparing a hollowed noble metal base: preparing a hollowed-out noble metal base frame in a forging and casting molding mode, wherein the hollowed-out noble metal base frame is made of gold-silver alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 28min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 7 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 68 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 48 parts of albite, 28 parts of tremolite, 14 parts of borax, 12 parts of volcanic rock, 12 parts of talc, 3.5 parts of strontium carbonate, 11 parts of magnesium carbonate and 12 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1050 ℃ for 7 hours;

step S603: cooling the calcined mixture to 670 ℃, adding 6 parts of colorant (the colorant is vanadium oxide), heating to 890 ℃, and keeping for 4.5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 48 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 12000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.06% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 290 ℃ for 9min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 6

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame in a forging and casting molding mode, wherein the hollowed noble metal base frame is made of silver-platinum alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 21min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 4 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 64 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 44 parts of albite, 24 parts of tremolite, 8 parts of borax, 18 parts of volcanic rock, 16 parts of talc, 2 parts of strontium carbonate, 14 parts of magnesium carbonate and 9 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1090 ℃ for 8 hours;

step S603: cooling the calcined mixture to 660 ℃, adding 3 parts of colorant (phthalocyanine blue), heating to 820 ℃ and keeping for 5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 39% of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with the viscosity of 13000mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.05% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 265 ℃ for 8min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 7

Step S1: preparing a hollowed noble metal base: preparing a hollowed-out noble metal base frame in a forging and casting molding mode, wherein the hollowed-out noble metal base frame is made of platinum-palladium alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 29min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 6 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 67 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 46 parts of albite, 26 parts of tremolite, 12 parts of borax, 16 parts of volcanic rock, 14 parts of talc, 2.5 parts of strontium carbonate, 15 parts of magnesium carbonate and 11 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1110 ℃ for 5 hours;

step S603: cooling the calcined mixture to 640 ℃, adding 7 parts of colorant (manganese oxide as colorant), heating to 880 ℃, and keeping for 4 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 46 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 12500mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.04% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 295 ℃ for 7min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 8

Step S1: preparing a hollowed noble metal base: preparing a hollowed noble metal base frame in a forging and casting molding mode, wherein the hollowed noble metal base frame is made of silver-palladium alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 26min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 5 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 61 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 49 parts of albite, 21 parts of tremolite, 7 parts of borax, 14 parts of volcanic rock, 11 parts of talc, 1.5 parts of strontium carbonate, 10 parts of magnesium carbonate and 14 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1080 ℃ for 7 hours;

step S603: cooling the calcined mixture to 620 ℃ with oil, adding 2 parts of a colorant (the colorant is benzidine yellow G), heating to 830 ℃, and keeping for 4.5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 41 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with viscosity of 14500mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.06% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 285 ℃ for 8min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 9

Step S1: preparing a hollowed noble metal base: preparing a hollowed-out noble metal base frame in a forging and casting molding mode, wherein the hollowed-out noble metal base frame is made of gold, silver and platinum alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 27min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 8 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 69 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 41 parts of albite, 29 parts of tremolite, 13 parts of borax, 30 parts of volcanic rock, 19 parts of talc, 3 parts of strontium carbonate, 12.5 parts of magnesium carbonate and 13 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln for 6 hours at 1120 ℃;

step S603: cooling the calcined mixture to 680 ℃, adding 5 parts of a colorant (the colorant is permanent orange G), heating to 870 ℃, and keeping for 3 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 44% of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with the viscosity of 10500mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.05% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 275 ℃ for 9min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

Example 10

Step S1: preparing a hollowed noble metal base: preparing a hollowed-out noble metal base frame in a forging and casting molding mode, wherein the hollowed-out noble metal base frame is made of silver-platinum-palladium alloy;

step S2: acid pickling treatment:

step S201: mixing hydrochloric acid and water according to the mixing ratio of 10: 100 parts of dilute hydrochloric acid solution;

step S202: placing the hollow precious metal base frame prepared in the step S1 into dilute hydrochloric acid pickling solution to be soaked and pickled for 30min, and then washing the hollow precious metal base frame with clear water and airing the hollow precious metal base frame;

step S3: preparing a metal plate: according to the designed enamel pattern, processing the position, corresponding to the hollow part of the hollow metal base frame, of the metal plate in a stamping, cutting, carving and other modes to obtain a groove with pattern textures, wherein the expansion coefficient of the metal plate is larger than that of the hollow precious metal base frame, the metal plate can be an NdFeB magnet plate with the thermal expansion coefficient of 4 x 10 < -6 >, and the thickness of the metal plate is 2 mm;

step S4: and (3) film sealing treatment:

step S401: heating the metal plate prepared in the step 3 to 70 ℃;

step S402: taking the mass ratio of 9: 1, uniformly spraying the kettle adhesion preventing agent and the polyaryl organic silicon resin on the surface of a metal plate through an atomizer, wherein the kettle adhesion preventing agent is HG-11A type efficient kettle adhesion preventing agent;

step S403: cooling to room temperature to form a sealing film on the outer surface of the metal plate;

step S5: positioning and fixing: horizontally placing the hollowed precious metal base frame on the top of the metal plate, aligning the hollowed part with the groove, and clamping and fixing the hollowed precious metal base frame and the metal plate by using a clamp;

step S6, preparing enamel low-temperature glaze:

step S601: taking the following raw materials: 45 parts of albite, 25 parts of tremolite, 14 parts of borax, 18 parts of volcanic rock, 12 parts of talc, 2 parts of strontium carbonate, 12 parts of magnesium carbonate and 10 parts of zinc oxide, uniformly mixing, crushing and sieving;

step S602: calcining the sieved mixture in a kiln at 1180 ℃ for 6.5 hours;

step S603: cooling the calcined mixture to 690 ℃ with oil, adding 8 parts of a colorant (wherein the colorant comprises 1 part of chromium oxide, 1 part of cobalt oxide, 1.5 parts of zirconium oxide, 0.5 part of copper oxide, 1 part of vanadium oxide, 1 part of phthalocyanine blue, 0.5 part of manganese oxide, 0.5 part of benzidine yellow G and 1 parts of permanent orange), heating to 840 ℃ and keeping for 5 hours;

step S604: cooling natural oil to below 100 ℃, adding water accounting for 40 percent of the total mass of the raw materials, and grinding by a ball mill to obtain the enamel low-temperature glaze;

step S7: filling glaze: mixing sodium polyacrylate with the viscosity of 11500mPa & S with the enamel low-temperature glaze prepared in the step 6 according to the mass of the sodium polyacrylate accounting for 0.04% of the mass of the low-temperature glaze, and then filling the mixture into the hollow part of the hollow precious metal substrate and the groove of the metal plate which are positioned and fixed in the step S5;

step S8: firing: firing the hollowed-out noble metal substrate and the metal plate filled with the enamel low-temperature glaze at 300 ℃ for 10min, taking out, covering with an aluminum silicate fiber cylinder preheated to 200 ℃, and naturally cooling;

step S9: polishing treatment: removing the metal plate, and polishing the enamel-fired hollow precious metal substrate;

and preparing the enamel precious metal ornament.

In another aspect of the application, the precious metal enamel ornament is obtained by the preparation method. The precious metal enamel ornaments prepared by the method have good color presentation effect and finished product quality, and have outstanding stereoscopic vision effect.

The noble metal in the present application may be one of gold, silver, platinum, palladium or an alloy of any combination thereof. Some precious metal ornaments with higher purity are softer in texture, and enamel is fired on the hollow precious metal base frame, so that the deformation resistance of the enamel precious metal ornaments can be improved. The precious metal enamel ornament may be any type of ring, bracelet, necklace, pendant, earring, hair ornament, etc., and is not limited thereto.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the various features, components, and methods of operation of the embodiments can be adaptively changed and arranged in one or more different arrangements than the embodiments. All of the features disclosed in this specification (including any accompanying claims, abstract) and all of the components or acts of any method or feature so disclosed, may be combined in any combination, except combinations where at least some of such features and/or components or acts are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.