阅读说明：本技术 黑底银光网纹釉及制备方法、带黑底银光网纹釉的瓷体 (Black-bottom silver light net grain glaze, preparation method thereof and porcelain body with black-bottom silver light net grain glaze ) 是由 陈进群 于 2021-01-21 设计创作，主要内容包括：本申请涉及陶瓷领域,公开了黑底银光网纹釉及制备方法、带黑底银光网纹釉的瓷体,黑底银光网纹釉包括底釉和面釉,底釉浆料包括以下质量份原料：紫泥干粉88～93份,三氧化二铁粉末2.6～3.4份,氧化镁粉末3.2～3.7份,石灰石粉末2.3～2.8份；面釉浆料包括以下质量份原料：四氧化三铁粉末21.5～24.6份,紫泥干粉74～77份；制备烧制包括以下阶段：升温至558～565℃,升温时间290～310min；继续升温至895～908℃,升温时间185～210min,升温结束后保温8～15min；继续升温至1235～1260℃,升温时间350～365min,升温结束后保温25～35min；降温至1126～1160℃,降温时间140～160min；继而特定的底釉、面釉成分并在特定的温度下烧制,面釉烧结熔融时扩散、冷却后呈黑色,底釉烧结熔融时汇聚收缩并鼓起显露于面釉外、冷却后呈银白色,最终呈现出“黑底银纹”的釉彩。(The application relates to the field of ceramics, and discloses a black-background silver light net grain glaze, a preparation method thereof and a porcelain body with the black-background silver light net grain glaze, wherein the black-background silver light net grain glaze comprises a ground glaze and a cover glaze, and the ground glaze slurry comprises the following raw materials in parts by mass: 88-93 parts of purple mud dry powder, 2.6-3.4 parts of ferric oxide powder, 3.2-3.7 parts of magnesium oxide powder and 2.3-2.8 parts of limestone powder; the overglaze slurry comprises the following raw materials in parts by mass: 21.5-24.6 parts of ferroferric oxide powder and 74-77 parts of purple mud dry powder; the preparation firing comprises the following stages: heating to 558-565 ℃ for 290-310 min; continuously heating to 895-908 ℃, keeping the temperature for 185-210 min, and keeping the temperature for 8-15 min after the temperature is raised; continuously heating to 1235-1260 ℃, keeping the temperature for 350-365 min, and keeping the temperature for 25-35 min after the temperature is raised; cooling to 1126-1160 ℃ for 140-160 min; and then specific ground glaze and overglaze components are fired at a specific temperature, the overglaze is black after diffusion and cooling when in sintering and melting, the ground glaze is converged and contracted when in sintering and melting, is exposed outside the overglaze and is silvery white after cooling, and finally presents the enamel color with black ground silver stripes.)

1. A black-background silver light screen grain glaze is characterized by comprising a ground glaze and a cover glaze,

the ground glaze is obtained by firing the ground glaze slurry after glazing, the thickness of the ground glaze slurry glazing is 3-4mm,

the ground glaze slurry is prepared by mixing and ball-milling the following raw materials in parts by weight and then screening the mixture through a 200-mesh screen:

88-93 parts of purple mud dry powder,

2.6 to 3.4 parts of ferric oxide powder,

3.2 to 3.7 parts of magnesium oxide powder,

2.3-2.8 parts of limestone powder;

the overglaze is obtained by firing after overglaze slurry glazing, the overglaze slurry glazing thickness is 1-1.5mm,

the overglaze slurry is prepared by mixing and ball-milling the following raw materials in parts by mass, and then screening and filtering the mixture by a 200-mesh screen:

21.5-24.6 parts of ferroferric oxide powder,

74-77 parts of purple mud dry powder;

the base glaze and the overglaze are fired at variable temperatures, and the firing comprises the following stages:

in the first stage, the temperature is raised from the normal temperature to 558-565 ℃, the time of temperature rise is 290-310 min,

in the second stage, after the first stage of temperature rise is finished, the temperature is continuously raised to 895-908 ℃, the temperature rise time is 185-210 min, the temperature is kept for 8-15 min after the temperature rise is finished,

in the third stage, after the second stage of heat preservation is finished, the temperature is continuously raised to 1235-1260 ℃, the temperature raising time is 350-365 min, the heat preservation is carried out for 25-35 min after the temperature raising is finished,

and in the fourth stage, after the heat preservation in the third stage is finished, cooling to 1126-1160 ℃ for 140-160 min.

2. The black-under-glaze silver optical-mesh glaze according to claim 1, wherein the under-glaze slurry raw material comprises an under-glaze preparation water, the under-glaze preparation water is obtained by mixing free water and calcium hydroxide added when the under-glaze slurry is mixed into slurry, and the mass ratio of the water to the calcium hydroxide in the under-glaze preparation water is 100: 1.3-100: 1.5.

3. the process for preparing black matrix silver optical screen glaze according to claim 1 or 2, which comprises the preparation of ground glaze slurry, the preparation of overglaze slurry, biscuit glazing and firing,

the preparation of the ground glaze slurry comprises the following steps:

d1: mixing the raw materials of the ground glaze slurry, performing ball milling, and screening and filtering by a 200-mesh screen after ball milling to obtain primary ground slurry;

the preparation of the overglaze slurry comprises the following steps:

m1: mixing the raw materials of the overglaze slurry, carrying out ball milling, and then screening and filtering by a 200-mesh screen to obtain primary milled slurry;

m2: stirring and ageing the primary ground slurry for 12-20 h, and defoaming to obtain the overglaze slurry.

4. The process for preparing black matrix silver optical screen glaze according to claim 2, wherein in the firing process,

and adjusting the firing atmosphere during the temperature rise in the third stage, wherein the partial pressure of carbon dioxide in the firing atmosphere is increased to 5.6MPa when the firing temperature is 1000 ℃, and the partial pressure of carbon dioxide in the firing atmosphere is increased to 7.4MPa when the firing temperature is 1235 ℃.

5. The process for preparing black matrix silver optical screen glaze according to claim 4, wherein, in the firing process,

when the temperature is reduced in the fourth stage, the firing atmosphere is adjusted, and the partial pressure of carbon dioxide is reduced to 2.6MPa in the fourth stage.

6. The process according to claim 5, wherein the firing step further comprises a temperature reduction step after the fourth step, during which the partial pressure of carbon dioxide in the firing atmosphere is reduced by adjustment,

when the temperature is reduced to 900 ℃, the partial pressure of the carbon dioxide is adjusted to be reduced to 0.2-0.21 MPa;

when the temperature is reduced to 500 ℃, the partial pressure of the carbon dioxide is adjusted to be reduced to 0.01-0.02 MPa.

7. A porcelain body with black-bottom silver light net grain glaze is characterized by comprising a porcelain body and a glaze layer positioned on the surface of the porcelain body, wherein the glaze layer is the black-bottom silver light net grain glaze according to any one of claims 1-2.

8. A porcelain body with black-bottom silver light net grain glaze is characterized by comprising a porcelain body and a glaze layer positioned on the surface of the porcelain body, wherein the glaze layer is the black-bottom silver light net grain glaze prepared by the method of claims 3-6.

Technical Field

The application relates to the field of ceramics, in particular to a black-bottom silver light net grain glaze, a preparation method thereof and a porcelain body with the black-bottom silver light net grain glaze.

Background

The glaze is a colorless or colored vitreous thin layer covered on the surface of the ceramic product, and is prepared by grinding mineral raw materials and raw materials in a certain proportion to prepare glaze slip, applying the glaze slip on the surface of a blank body, and calcining at a certain temperature. The glaze can protect the ceramic and also has the effect of decorating and beautifying the ceramic. The existing ceramic glaze layer adopts a pasting glaze, a painting glaze or a pure-color glaze. Wherein the glaze is prepared by sticking a prepared glaze pattern on the porcelain and then burning. The glaze drawing is made by artificially drawing a supposed pattern on a biscuit by using glaze slip and firing. The pure colored glaze has transparent colors, but cannot meet the requirements of combining colors of colorful and messy patterns.

Therefore, the fancy glaze is provided at present, and the glaze layer is colorful and natural and changeable during firing, such as a kiln and a cup. There is a silver-lustrous under-glaze black grain glaze in the existing market, which is prepared by applying an under-glaze and an over-glaze on a biscuit in sequence, wherein the under-glaze and the over-glaze are different in melt flow polymerization state during sintering, the under-glaze (silver colour after firing) is diffused and dispersed in spots, and the over-glaze (black after firing) is extruded by the dispersed under-glaze to form root-whisker-shaped grains.

The inventor of the application researches the glaze layer with the black grain glaze pattern melody on the silvery background, and expects to obtain the black background silvery mesh glaze, wherein the positions of the background glaze and the surface glaze are directly exchanged in the research process, namely the background glaze is used as the surface glaze, the surface glaze is used as the background glaze, and only the silver gray porcelain body with holes, incomplete coverage of the glaze layer or uneven glaze layer is obtained, so the invention starts with the glaze layer formula research again and researches the black background silvery mesh glaze.

Disclosure of Invention

In order to provide a porcelain body with a black-bottom silver light net-shaped pattern, the application provides a black-bottom silver light net-shaped glaze and a porcelain body thereof.

In order to improve the firing yield of the porcelain body with the black-bottom silver light net-shaped patterns, the application provides a preparation process of the black-bottom silver light net-shaped glaze.

Firstly, the black-background silver light screen glaze provided by the application adopts the following technical scheme:

a black-background silver light screen grain glaze is characterized by comprising a ground glaze and a cover glaze,

the ground glaze is obtained by firing the ground glaze slurry after glazing, the thickness of the ground glaze slurry glazing is 3-4mm,

the ground glaze slurry is prepared by mixing and ball-milling the following raw materials in parts by weight and then screening the mixture through a 200-mesh screen:

88-93 parts of purple mud dry powder,

2.6 to 3.4 parts of ferric oxide powder,

3.2 to 3.7 parts of magnesium oxide powder,

2.3-2.8 parts of limestone powder;

the overglaze is obtained by firing after overglaze slurry glazing, the overglaze slurry glazing thickness is 1-1.5mm,

the overglaze slurry is prepared by mixing and ball-milling the following raw materials in parts by mass, and then screening and filtering the mixture by a 200-mesh screen:

21.5-24.6 parts of ferroferric oxide powder,

74-77 parts of purple mud dry powder;

the base glaze and the overglaze are fired at variable temperatures, and the firing comprises the following stages:

in the first stage, the temperature is raised from the normal temperature to 558-565 ℃, the time of temperature rise is 290-310 min,

in the second stage, after the first stage of temperature rise is finished, the temperature is continuously raised to 895-908 ℃, the temperature rise time is 185-210 min, the temperature is kept for 8-15 min after the temperature rise is finished,

in the third stage, after the second stage of heat preservation is finished, the temperature is continuously raised to 1235-1260 ℃, the temperature raising time is 350-365 min, the heat preservation is carried out for 25-35 min after the temperature raising is finished,

and in the fourth stage, after the heat preservation in the third stage is finished, cooling to 1126-1160 ℃ for 140-160 min.

By adopting the technical scheme, the glaze color with the 'black bottom silver lines' is finally presented under the coordination of tension in the sintering process of the overglaze and the under glaze.

Optionally, in the raw materials of the ground glaze slurry, ground glaze preparation water and calcium hydroxide are used, the ground glaze preparation water is free water added when the ground glaze slurry is mixed into slurry, and the mass ratio of the ground glaze preparation water to the calcium hydroxide is 100: 1.3-100: 1.5.

by adopting the technical scheme, the pH value of the ground glaze slurry is adjusted, the loss of the glaze layer is reduced, bubbles generated in the firing process of the glaze layer are reduced, the waterproofness of the glaze layer is improved, and the water absorption of the ceramic is reduced.

Secondly, the preparation process of the black-background silver light meshed glaze provided by the application adopts the following technical scheme:

a process for preparing black-background silver light screen-grain glaze comprises the steps of preparing ground glaze slurry, preparing overglaze slurry, glazing biscuit and firing,

the preparation of the ground glaze slurry comprises the following steps:

d1: mixing the raw materials of the ground glaze slurry, performing ball milling, and screening and filtering by a 200-mesh screen after ball milling to obtain primary ground slurry;

the preparation of the overglaze slurry comprises the following steps:

m1: mixing the raw materials of the overglaze slurry, carrying out ball milling, and then screening and filtering by a 200-mesh screen to obtain primary milled slurry;

m2: stirring and ageing the primary ground slurry for 12-20 h, and defoaming to obtain the overglaze slurry.

By adopting the technical scheme, the overglaze slurry is aged, the content of organic matters in the overglaze slurry is reduced, the loss of the overglaze slurry is reduced, bubbles generated in the firing process of the glaze layer are reduced, the waterproofness of the glaze layer is improved, and the water absorption of the ceramic is reduced.

Optionally, in the firing process, the firing atmosphere is adjusted during the temperature rise in the third stage, when the firing temperature is 1000 ℃, the partial pressure of carbon dioxide in the firing atmosphere is increased to 5.6MPa, and when the firing temperature is 1235 ℃, the partial pressure of carbon dioxide in the firing atmosphere is increased to 7.4 MPa.

By adopting the technical scheme, the glaze layer is sintered and densified at 1235-1260 ℃ in the firing process of the black-bottom silver light mesh glaze on the biscuit, gas in the glaze layer (the bottom glaze and the surface glaze) is extruded and discharged, holes and internal black cores are not uniformly fired along with the biscuit in the process, the biscuit can also be densified to discharge gas at 1235-1260 ℃, particularly, the contact surface of the biscuit and the glaze layer forms a eutectic body due to the melting of the bottom glaze, and the densification degree is larger, so that the glaze layer is melted and bubbles are blown out at 1235-1260 ℃.

In addition, when the glaze layer is sintered, the bottom glaze and the surface glaze are in different flowing and compact states, the bottom glaze flows and the surface glaze shrinks, and when bubbles generated in the biscuit or the bottom glaze escape outwards to a section between the surface glaze and the bottom glaze, the surface glaze shrinks and compacts to make the bubbles difficult to escape outwards, so that the finally sintered and cooled glaze layer is easy to generate sunken holes formed by gas cooling shrinkage in a black surface glaze area, and the sunken holes are small and deep (0.2-0.5 mm).

When bubbles generated in the biscuit or the ground glaze reach the spread ground glaze (without surface glaze covering) by curtain coating, the bubbles are not easy to obtain a molten mass for filling and repairing after the holes are opened, the surface of the glaze layer at the fourth stage is repaired under the principle of eutectic action (the molten temperature of components with the lowest melting point is higher than that of the components with the highest melting point and lower than that of the components with the highest melting point, the molten components coat the components without melting to form the eutectic mass, the interface of the components on the micro scale is compacted, and the surface is repaired from the surface to the smooth surface macroscopically), so that the surface of the glaze layer after final sintering and cooling is uneven, the uneven area is large, the depth is shallow (0.1-0.2 mm, most of the glaze layer is not a complete recess under the influence of the repairing of the molten mass, the appearance is presented as a high-low difference boundary trace with bending from the surface), and the gloss and.

Therefore, on the basis of preparing water by using the ground glaze containing calcium hydroxide in the ground glaze slurry raw material, the partial pressure of carbon dioxide in the firing process is controlled, the atmosphere in the pores of the glaze layer is replaced before the sintering, melting and densification of the glaze layer, the partial pressure of carbon dioxide in the atmosphere is increased along with the increase of the firing temperature, the partial pressure of carbon dioxide is increased to a threshold value when the glaze layer is sintered and melted,

the converted substance of calcium hydroxide in the ground glaze slurry (partial reaction is converted into carbonate in the process of preparing the ground glaze slurry, the calcium hydroxide is combined with organic matters and the like) is partially decomposed to produce calcium oxide in the process of heating to 1200 ℃, when the partial pressure of carbon dioxide is kept to be 7.4MPa above 1235 ℃, carbon dioxide can react with calcium oxide to form calcium carbonate, and therefore, when the glaze layer is sintered, air bubbles migrate to the ground glaze carbon dioxide to react to form calcium carbonate, the air pressure in the air bubbles is reduced, the air bubbles shrink and pull the peripheral molten mass of the air bubbles to shrink, the densification of the glaze layer is improved, the possibility of surface defects of overglaze and ground glaze and the degree of surface defects are reduced, and the water absorption of the glaze layer is.

Optionally, in the firing process, when the temperature starts to decrease in the fourth stage, the firing atmosphere is adjusted, and the partial pressure of carbon dioxide is decreased to 2.6MPa in the fourth stage.

By adopting the technical scheme, the densification process in the glaze layer is basically finished in the fourth stage, and the surface of the glaze layer in the fourth stage is sintered, deformed and repaired under the co-melting action principle.

According to the method, the partial pressure of carbon dioxide is reduced to 2.6MPa, so that when the surface is repaired at the fourth stage, calcium carbonate exposed on the surface of the glaze layer is decomposed and then mixed into the eutectic to be combined with silicate and fused quartz, and the repairing effect at the fourth stage is improved.

On the other hand, the calcium carbonate exposed on the surface of the glaze layer is decomposed at the fourth stage, so that the calcium carbonate exposed outside the glaze after the hardening of the glaze layer is finished at the fourth stage is reduced, the condition that the partial pressure of carbon dioxide is reduced faster than the cooling speed after the fourth stage is finished so that the calcium carbonate exposed outside the glaze is decomposed to generate a large amount of exposed nano-scale calcium oxide is avoided, and the condition that the nano-scale calcium oxide is dissolved out in the subsequent washing process to reduce the impermeability of the glaze layer is avoided.

Optionally, the firing further comprises a temperature reduction stage after the fourth stage, the partial pressure of carbon dioxide in the firing atmosphere is adjusted and reduced together during the temperature reduction stage,

when the temperature is reduced to 900 ℃, the partial pressure of the carbon dioxide is adjusted to be reduced to 0.2-0.21 MPa;

when the temperature is reduced to 500 ℃, the partial pressure of the carbon dioxide is adjusted to be reduced to 0.01-0.02 MPa.

By adopting the technical scheme, the partial pressure of carbon dioxide in the firing environment is reduced by stages, and the glaze layer is prevented from being split due to sudden change of the environment atmosphere.

Thirdly, the porcelain body with the black-bottom silver light net grain glaze adopts the following technical scheme:

the porcelain body with the black-bottom silver light net grain glaze comprises a porcelain body and a glaze layer positioned on the surface of the porcelain body, wherein the glaze layer is the black-bottom silver light net grain glaze.

By adopting the technical scheme, the porcelain body with the black-bottom silver light net grain glaze and low water absorption rate is obtained.

In summary, the present application has the following beneficial effects:

1. according to the method, specific ground coat and overglaze components are used in the firing process, and firing is carried out at a specific temperature, so that the overglaze is black after diffusion and cooling when being sintered and melted, the ground coat is converged, contracted and swelled when being sintered and melted, and is silvery white after being exposed outside the overglaze and cooled, and the overglaze finally present the glaze color of 'black ground silver lines' under the coordination of tension in the sintering process. 2. In the application, on the basis of preparing water by using a ground glaze containing calcium hydroxide in a ground glaze slurry raw material, the partial pressure of carbon dioxide in the firing process is controlled, the atmosphere in pores of the glaze layer is replaced before the glaze layer is sintered, melted and densified, the partial pressure of carbon dioxide in the atmosphere is increased along with the increase of the firing temperature, when the glaze layer is sintered and melted, the partial pressure of carbon dioxide is increased to a threshold value, a converted substance of calcium hydroxide in the ground glaze slurry (part of the converted substance is reacted into carbonate in the process of preparing the ground glaze slurry, is combined with organic matters and the like) is partially decomposed to produce calcium oxide in the process of heating to 1200 ℃, when the partial pressure of carbon dioxide is maintained to be 7.4MPa at the temperature of more than 1235 ℃, the carbon dioxide can react with the calcium oxide to form calcium carbonate, so that bubbles migrate to the carbon dioxide in the ground glaze layer to react to form calcium carbonate in the process of, the densification of the glaze layer is improved, the possibility of surface defects of the overglaze and the ground glaze is reduced, the degree of the surface defects is reduced, and the water absorption of the glaze layer is reduced.

Detailed Description

[ preparation example of ground glaze slurry ]

Preparation A1

A ground glaze slurry is prepared by the following steps: weighing 8.8kg of purple mud dry powder, 2.6kg of ferric oxide powder, 3.2kg of magnesium oxide powder, 2.3kg of limestone powder, 75kg of ground glaze preparation water and 9kg of high-alumina marble ball mill, mixing and ball-milling, wherein the ground glaze preparation water is prepared by ball-milling water and calcium hydroxide according to the mass ratio of 100:1.3 for 3h, screening out large particles by using a 200-mesh screen, and adding ground glaze preparation water to prepare slurry adjusted to 35 baume degrees. The total consumption of the ground glaze preparation water is 9.7 kg.

Preparation examples A2 to A4

A ground glaze slurry is based on preparation example A1, and is characterized in that the raw material dosage of the ground glaze slurry is different.

The amounts of the starting materials used in preparation examples A1 to A4 are shown in the table below.

TABLE 1 usage of the base glaze slurries of preparation examples A1-A4

[ preparation example of overglaze slurry ]

Preparation B1

The overglaze slurry is prepared by the following steps:

m1: weighing 2.15kg of ferroferric oxide powder, 7.4kg of purple mud dry powder, 8kg of water and 5kg of high-alumina marble ball mill, mixing and ball-milling for 3h, screening out large particles by using a 200-mesh screen, wherein the screening retention rate is less than 0.15 wt%, and adding ground glaze to prepare a primary grinding slurry which is adjusted to 45 baume degree by water;

m2: stirring and ageing the primary ground slurry for 18h, defoaming, supplementing water and adjusting the consistency to 45 Baume degrees to obtain the overglaze slurry.

The active water addition amount in the steps M1 and M2 is 9.06 kg.

Preparation examples B2 to B4

An overglaze slurry is based on preparation example B1, and is characterized in that the overglaze slurry has different raw material dosage.

The amounts of the starting materials used in preparation examples B1 to B4 are shown in the table below.

TABLE 2 raw material consumption of overglaze slurries of preparation examples B1-B4

Preparation B5

The overglaze slurry is prepared by the following steps: weighing 2.15kg of ferroferric oxide powder, 7.4kg of purple mud dry powder, 8kg of water and 5kg of high-alumina marble ball mill, mixing and ball milling for 3h, sieving out large particles by using a 200-mesh sieve, wherein the sieving rate is less than 0.15 wt%, and then adding ground glaze preparation water to adjust the ground glaze slurry to 45 baume degrees, wherein the total dosage of the ground glaze preparation water is 8.93 kg.

Example 1

The utility model provides a take porcelain body of black end silver light net grain glaze, its includes porcelain body and the glaze layer that is located the porcelain body outside, and the glaze layer is black end silver light net grain glaze.

The shape and size of the porcelain body can be determined according to actual conditions, and the porcelain body is formed by firing a biscuit plate body of 25cm by 2.5 cm.

The glaze layer wraps the porcelain body completely.

The preparation method of the porcelain body with the black-bottom silver light net grain glaze comprises the following steps:

s1: dipping the biscuit by a glaze dipping method to apply base glaze slurry, wherein the glazing thickness of the base glaze slurry is 3.5mm,

s2: after the surface of the ground glaze slurry on the surface of the biscuit is dried, applying the overglaze slurry in a glaze spraying mode, wherein the glazing thickness of the overglaze slurry is 1.2 mm; s3: and firing after the overglaze slurry is dried, wherein the firing comprises the following stages:

the first stage, the temperature is raised from normal temperature to 560 ℃, the time of temperature rise is 308min,

in the second stage, after the first stage of temperature rise is finished, the temperature is continuously raised to 905 ℃ for 196min, the temperature is kept for 10min after the temperature rise is finished,

and the third stage, after the second stage heat preservation, continuously heating to 1250 ℃, wherein the heating time is 355min, the carbon dioxide partial pressure in the firing atmosphere is increased in the heating process, wherein the carbon dioxide partial pressure in the firing atmosphere is increased to 5.6MPa when the firing temperature is 1000 ℃, the carbon dioxide partial pressure in the firing atmosphere is increased to 7.4MPa when the firing temperature is 1235 ℃, and the heat preservation is carried out for 30min after the heating is finished,

in the fourth stage, after the heat preservation in the third stage is finished, the temperature is reduced to 1148 ℃, the temperature reduction time is 155min, the partial pressure of carbon dioxide in the firing atmosphere is reduced in the temperature reduction process, and the partial pressure of carbon dioxide is reduced to 2.6MPa when the temperature is reduced to 1148 ℃;

a fifth stage, after the fourth stage, cooling in a gradient manner, wherein the temperature is reduced to 900 ℃ from the fourth stage for 215mn, the partial pressure of carbon dioxide is reduced to 0.2MPa, the temperature is reduced to 500 ℃ from 900 ℃, the temperature reduction time is 183mn, the partial pressure of carbon dioxide is reduced to 0.02MPa, the temperature is reduced to 200 ℃ from 500 ℃, the temperature reduction time is 156min, the temperature is reduced to room temperature from 200 ℃, and the temperature reduction time is 76min,

finally obtaining the porcelain body with the black-bottom silver light net grain glaze.

Examples 2 to 5

A porcelain body with black-bottom silver light net grain glaze is based on the embodiment 1, and is characterized in that the processing technological parameters of the glaze layer are different.

The process parameters for examples 1-6 are shown in the table below.

TABLE 3 Process parameters for examples 1 to 6

Example 7

An enamel body with a black-background silver light mesh glaze is based on example 5, and is characterized in that water is prepared in the ground glaze slurry instead of the ground glaze.

Comparative example 1

An enamel body with a black-background silver veined glaze, based on example 7, with the difference that the carbon dioxide atmosphere in the firing atmosphere during firing is 0.05 MPa.

Example 8

An porcelain body with a black-background silver optical screen glaze, based on example 7, except that the carbon dioxide atmosphere in the firing atmosphere during firing was 0.05MP, and that the overglaze slurry used preparation B5.

Example 9

An enamel body with a black-background silver veined glaze, based on example 5, with the difference that the overglaze slurry used preparation B5.

Example 10

A ceramic body with a silver veined glaze with a black background, based on example 5, is naturally transformed in partial pressure of carbon dioxide as a function of firing temperature after the end of the third stage.

Example 11

An enamel body with a black-background silver veined glaze, based on example 5, was naturally transformed in partial pressure of carbon dioxide as a function of firing temperature after the end of the fourth phase.

The occurrence rates of the defective products (surface defects such as deformation, pinholes, concave indentations, chipping and cracking are all defective products here) in the ceramic body obtaining processes of examples 1 to 11 and comparative example 1, and pinholes, concave indentations and the like in the defective products are counted. (wherein, when counting the occurrence rate of the pinhole and the concave indentation, the respective independent techniques are adopted, namely if the pinhole and the concave indentation exist on a finished product at the same time, the count of the pinhole and the concave indentation is added by one).

The test results are shown in table 4 below.

TABLE 4 Defect detection results of the products of examples 1 to 11 and comparative example 1

(less than 0.1% of the burnt product has corresponding product problems for discovery)

By combining examples 1-6, comparative example 1 and table 4, it can be known that in comparative example 1, there are many humus, and there are many bubbles and large loss on ignition during firing, and meanwhile, in the firing process, the bottom glaze exposed surface is sunken, and the bubbles between the bottom glaze surface glazes are not repaired, so that the waste products of pinholes and indentations are increased; through the ground glaze preparation water use and fire atmosphere and adjust collaborative technology improvement, appear sunken, the bubble between the ground glaze overglaze of ground glaze surface and repair firing in-process, reduced the waste product of pinhole, indentation, reduce the rejection rate.

By combining example 5, example 7, comparative example 1, example 8 and table 4, it can be seen that the improvement of the water preparation of the glaze in the present application can also reduce humus, reduce the amount of bubbles and loss of ignition during firing, reduce the waste products of pinholes and indentations, and reduce the rejection rate.

It is understood from the combination of examples 5 and 9 and Table 4 that the glaze slurry can reduce humus, decrease bubble amount and ignition loss during firing, reduce defective products of pinholes and indentations, and reduce the defective rate after aging.

As is clear from examples 5, 10, 11 and table 4, the present application can reduce the number of pin holes and indentations and the defective index by continuously controlling and adjusting the change in the atmospheric pressure after the third stage of firing.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.