阅读说明：本技术 一种陶瓷修补材料以及陶瓷修补方法 (Ceramic repairing material and ceramic repairing method ) 是由 林孝发 林孝山 程鑫涛 旷永继 闵卫 于 2020-11-27 设计创作，主要内容包括：本发明公开了一种陶瓷修补材料,其原料按照质量份组成包括：80目～100目蓝晶石20～25份、180目～250目蓝晶石24～30份、底釉干粉12～15份、钠长石8～10份、氧化铝10～18份、冰晶石5～15份、高岭土10～12份、煅烧高岭土5～6份和CMC干粉0.5～2份。本发明还公开了基于上述陶瓷修补材料的修补方法,其中冰晶石分解产生的氟化物及蒸汽能够使蓝晶石反应温度在1180℃左右时分解率大幅提升,保温时间可缩短在5min内,蓝晶石分解所产生的体积膨胀效应足以完全抵消其他原料的体积收缩,修补效果好,能耗低,效率高。(The invention discloses a ceramic repairing material which comprises the following raw materials in parts by mass: 20-25 parts of 80-100-mesh kyanite, 24-30 parts of 180-250-mesh kyanite, 12-15 parts of ground glaze dry powder, 8-10 parts of albite, 10-18 parts of alumina, 5-15 parts of cryolite, 10-12 parts of kaolin, 5-6 parts of calcined kaolin and 0.5-2 parts of CMC dry powder. The invention also discloses a repairing method based on the ceramic repairing material, wherein the fluoride and steam generated by cryolite decomposition can greatly improve the decomposition rate of kyanite at the reaction temperature of 1180 ℃, the heat preservation time can be shortened within 5min, the volume expansion effect generated by kyanite decomposition can completely offset the volume shrinkage of other raw materials, the repairing effect is good, the energy consumption is low, and the efficiency is high.)

1. A ceramic repair material characterized by: the ceramic repair material comprises the following raw materials in parts by mass: 20-25 parts of 80-100-mesh kyanite, 24-30 parts of 180-250-mesh kyanite, 12-15 parts of ground glaze dry powder, 8-10 parts of albite, 10-18 parts of alumina, 5-15 parts of cryolite, 10-12 parts of kaolin, 5-6 parts of calcined kaolin and 0.5-2 parts of CMC dry powder.

2. The ceramic repair material as set forth in claim 1, wherein: the ground glaze dry powder comprises the following components in parts by mass: 13-15 parts of quartz, 28-35 parts of potassium feldspar, 1-2 parts of dolomite, 4-6 parts of zinc oxide, 1-2 parts of alumina, 7-10 parts of zirconium silicate, 4-6 parts of kaolin, 21-25 parts of wollastonite, 8-12 parts of albite, 1-2 parts of frit, 0.2-0.3 part of alkali surface and 0.2-0.3 part of CMC dry powder.

3. The ceramic repair material as set forth in claim 1, wherein: the ceramic repairing material is prepared by mixing the raw materials, drying, uniformly ball-milling and mixing, and sieving with a 80-mesh sieve according to the following steps: water: the mass ratio of the glycerol is 100: 16-20: 4-7 refining into a dough.

4. A method of repairing a ceramic, comprising the steps of:

1) pretreating the crack of the ceramic;

2) filling the ceramic repair material according to any one of claims 1 to 3 into the crack gap, and pressing the ceramic repair material to be flush with the exposed surface of the ceramic body;

3) and (3) sintering in an oxygen atmosphere, wherein the sintering temperature is controlled to be 1170-1180 ℃, and the heat preservation time is 2-5 min.

5. The ceramic repair method according to claim 4, wherein: the width of the crack is less than or equal to 3mm, and the length of the crack is less than or equal to 100 mm.

6. The ceramic repair method according to claim 4, wherein: in the step 1), the pretreatment is to polish the glaze layer at the crack completely to expose the porcelain body, open the crack to release stress, polish the crack into a regular notch and blow the notch clean with compressed air.

7. The ceramic repair method according to claim 4, wherein: between the step 2) and the step 3), the method further comprises the steps of covering the ceramic repairing material with a repairing glaze, compressing the repairing glaze, keeping the height higher than that of the original glaze by 0.2-0.3 mm, and smearing the repairing glaze to be smooth.

8. The ceramic repair method according to claim 7, wherein: the raw materials of the repair glaze material have the same composition as the ground glaze dry powder.

9. The ceramic repair method according to claim 8, wherein: the repair glaze is prepared by mixing the raw materials, performing ball milling, sieving with a 180-mesh sieve, drying, grinding into powder, sieving with a 80-mesh sieve, and taking the sieved parts according to the following materials: water: the mass ratio of the glycerol is 100: 16-20: 4-7, and refining into paste.

Technical Field

The invention relates to the technical field of ceramic post-treatment, in particular to a ceramic repairing material and a ceramic repairing method.

Background

The existing sanitary ceramic repairing material mainly adopts kyanite, sillimanite, andalusite and the like with high-temperature decomposition expansion characteristics to reduce the volume shrinkage of other repairing materials in the porcelain transformation process under the action of a flux, and simultaneously, porcelain powder is added as a filler to reduce the shrinkage, and ground glaze powder is added to assist the melting.

Because the temperature required by the complete decomposition of the materials such as the kyanite and the like is higher (the nucleation temperature of the mullite of the kyanite is 1150 ℃ and the crystallization growth temperature is 1250 ℃), and the decomposition reaction time is longer, the corresponding temperature for the re-sintering of the sanitary ceramics is higher. However, due to the requirements of energy conservation and emission reduction and the cost of enterprises, the sintering temperature of the integral blank glaze in the sanitary ceramic industry is continuously reduced, in order to reach the decomposition temperature of the kyanite in the repairing material, the rising temperature of the re-sintering temperature of the sanitary ceramic easily causes the defects of devitrification and devitrification of the glaze surface, glaze slip at the trademark and the like, and many enterprises can only ensure the reaction time of decomposition and expansion of the kyanite in the repairing material by prolonging the heat preservation time of the sintering stage, so that the shrinkage and the depression of the repairing part are ensured to be small, and the problems cause high energy consumption, low efficiency and insufficient yield required by the re-sintering.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a ceramic repairing material and a ceramic repairing method.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

the invention provides a ceramic repairing material which comprises the following raw materials in parts by mass: 20-25 parts of 80-100-mesh kyanite, 24-30 parts of 180-250-mesh kyanite, 12-15 parts of ground glaze dry powder, 8-10 parts of albite, 10-18 parts of alumina, 5-15 parts of cryolite, 10-12 parts of kaolin, 5-6 parts of calcined kaolin and 0.5-2 parts of CMC dry powder.

Optionally, the ground glaze dry powder comprises the following components in parts by mass: 13-15 parts of quartz, 28-35 parts of potassium feldspar, 1-2 parts of dolomite, 4-6 parts of zinc oxide, 1-2 parts of alumina, 7-10 parts of zirconium silicate, 4-6 parts of kaolin, 21-25 parts of wollastonite, 8-12 parts of albite, 1-2 parts of frit, 0.2-0.3 part of alkali surface and 0.2-0.3 part of CMC dry powder.

Optionally, the ceramic repair material is prepared by mixing the raw materials, drying, ball-milling the mixed materials uniformly, and sieving the mixed materials with a 80-mesh sieve, wherein the raw materials are as follows: water: the mass ratio of the glycerol is 100: 16-20: 4-7 refining into a dough.

The invention also provides a ceramic repairing method, which comprises the following steps:

1) pretreating the crack of the ceramic;

2) filling the ceramic repair material according to any one of claims 1 to 3 into the crack gap, and pressing the ceramic repair material to be flush with the exposed surface of the ceramic body;

3) and (3) sintering in an oxygen atmosphere, wherein the sintering temperature is controlled to be 1170-1180 ℃, and the heat preservation time is 2-5 min.

Optionally, the width of the crack is less than or equal to 3mm, and the length of the crack is less than or equal to 100 mm.

Optionally, in step 1), the pretreatment is to polish the glaze layer at the crack completely to expose the porcelain body, open the crack to release stress, polish the crack into a regular notch, and blow the crack clean with compressed air.

Optionally, between step 2) and step 3), the method further comprises the steps of covering the ceramic repairing material with a repairing glaze, compressing the repairing glaze, keeping the height higher than that of the original glaze by 0.2-0.3 mm, and smearing the repairing glaze to be smooth.

Optionally, the raw materials of the repair glaze have the same composition as the ground glaze dry powder.

Optionally, the repair glaze is prepared by mixing the raw materials, performing ball milling, sieving with a 180-mesh sieve, drying, grinding into powder, sieving with a 80-mesh sieve, and taking the sieved parts according to the following materials: water: the mass ratio of the glycerol is 100: 16-20: 4-7, and refining into paste.

The invention has the beneficial effects that:

1) by adding cryolite as a catalyst, fluoride and steam generated by cryolite decomposition can greatly improve the decomposition rate of kyanite at the reaction temperature of 1180 ℃, the heat preservation time can be shortened within 5min, the volume expansion effect generated by kyanite decomposition can fully offset the volume shrinkage of other raw materials, the shrinkage depression of a repaired part is small, the repairing effect is good, the energy consumption is low, and the efficiency is high;

2) the repair material is used as a repair bottom material, the content of a flux (bottom glaze dry powder, albite and cryolite) reaches 25 percent or more, a liquid phase can be formed after high-temperature melting and is filled in gaps of crystals such as kyanite crystals and mullite crystals, and the strength reaches more than 75MPa after the sintering is measured; meanwhile, the liquid phase cooling can play a role in connecting the green body with the repair backing material, the strength is high after repair, the bonding performance is good, and the product strength cannot be reduced after repair;

3) the repairing bottom material is added with CMC dry powder, and the CMC long chain is combined with the particles of the repairing bottom material, so that the bonding strength between the bottom material and the bonding strength between the bottom material and the ceramic body are increased; meanwhile, the CMC has water-retaining property, and can avoid cracking caused by volume shrinkage generated by rapid removal of free water in a temperature rise stage;

4) the addition amount of the kaolin and the calcined kaolin of the repair backing material reaches more than 15 percent, the free water and the bound water can be kept to be tightly bonded with the blank body during the temperature rise stage, and the defects of cracking, glaze shortage and the like of repair points of the temperature rise stage are not easy to generate;

5) in the repair bed charge, 80-100-mesh kyanite is used as a framework support, so that the shrinkage of a heating section is reduced, and the cracking of the heating section is avoided; the 180-250 mesh kyanite has a finer particle size, can react with cryolite more sufficiently, and promotes the reaction expansion temperature to be further reduced.

Drawings

FIGS. 1a to 1e are schematic views of the ceramic surface at various stages in the repair process of example 2.

Detailed Description

The invention is further explained below with reference to the figures and the specific embodiments. A

Examples 1 to 4

The ceramic repair materials of the embodiments 1 to 4 are prepared according to the compositions in parts by weight in the table 1, dried after being prepared, evenly mixed by ball milling for 3 to 5min by using a rapid ball mill, and sieved by a 80-mesh sieve after being milled; according to the material: water: the mass ratio of the glycerol is 100: 18: 5 refining the ceramic repairing material into a ball shape as a repairing bottom material. Wherein the ground glaze dry powder comprises the following components: 13 parts of quartz, 32 parts of potassium feldspar, 1 part of dolomite, 5 parts of zinc oxide, 1 part of alumina, 9 parts of zirconium silicate, 5 parts of kaolin, 25 parts of wollastonite, 10 parts of albite, 2 parts of frit, 0.2 part of soda powder and 0.2 part of CMC dry powder. The praseodymium yellow pigment is used as one of the pigments, and the specific pigment can be prepared according to the color of different blanks and selectively added.

The composition of the raw materials of the repair glaze is the same as that of the ground glaze dry powder, the ingredients are ball-milled for 20-25 min by using a rapid ball mill, the mixture is milled and sieved by a 180-mesh sieve, the mixture is dried and then ground into powder, the powder is sieved by a 80-mesh sieve, and the undersize part is taken as the raw material: water: the mass ratio of the glycerol is 100: 18: 5, the repairing glaze is kneaded into paste.

Referring to fig. 1, selecting a ceramic product (fig. 1a) with cracks or dirty glaze surfaces, wherein the width of each crack is less than or equal to 3mm, the length of each crack is less than or equal to 100mm, polishing a glaze layer at the crack position completely by using a pneumatic polishing pen to expose a ceramic body, reserving a point of gradient of glaze near the crack, opening the crack position by using a vibrating pen, releasing stress, polishing slurry cracks into regular gaps, and blowing clean repaired positions by using compressed air (fig. 1 b); filling the repair backing material into the opened crack gap, pressing the repair backing material to be flush with the exposed surface of the porcelain body, and polishing the residual repair material by using a polishing pen (figure 1 c); twisting the repair glaze into strips, covering the repair positions, pressing the repair glaze tightly by using a polyethylene pressing rod, keeping the height of the repair glaze higher than that of the original glaze by 0.2-0.3 mm, and smearing the repair glaze to be flat and smooth (figure 1 d); and (3) sintering by using a tunnel kiln, wherein the sintering period is 18h in an oxidizing atmosphere, the sintering temperature is controlled to be 1170-1180 ℃, the temperature is kept for 4min, and the sintered glaze surface is flat and has no chromatic aberration (shown in figure 1 e).

Comparative examples 1 to 3

The ceramic repair materials of comparative examples 1 to 3 were prepared in the compositions of parts by weight shown in table 1 and used as a repair primer, and the treatment method, the repair glaze and the repair process of the ceramic repair materials were the same as those of examples 1 to 4.

Table 1:

the physical properties of the ceramic workpieces repaired with the repair materials of examples 1 to 4 and comparative examples 1 to 3 are shown in Table 2.

Table 2:

it can be seen from table 2 that the formula of comparative example 1 only contains kyanite, and the volume shrinkage caused by the formation of liquid phase at high temperature is zero, the firing shrinkage is 0, but no liquid phase is filled in the crystal gap, so that the strength is low, the binding property with the blank is poor, and the repair point falls off in the thermal shock resistance test; comparative example 2 introduces albite melted at high temperature and ground glaze powder to provide a liquid phase, the generation of the high temperature liquid phase provides a favorable environment for the growth of crystals and promotes the growth of mullite decomposed by kyanite, the melted liquid phase is filled in the gaps of the crystals to enhance the strength and the thermal shock resistance, simultaneously the water absorption is greatly reduced, and kaolin and calcined kaolin are introduced to enhance the bonding property of the repair material and the blank body, but the kaolin and calcined kaolin are accompanied by partial volume shrinkage, so that the repair points are easy to dent, and the appearance effect is poor. Embodiment 1 ~ 4 add cryolite, cryolite not only reacts with kyanite and produces the aluminium silicon phase that contains fluorine, still provide the required catalytic atmosphere of kyanite decomposition reaction process, reduce kyanite decomposition temperature, accelerate reaction rate, make the shrink by burning have great reduction, catalytic reaction is comparatively obvious, and the water absorption rate reduces in step, the formula vitrification is more complete, intensity promotes obviously, and along with the volume expansion effect that the cryolite catalysis kyanite reaction produced of the increase of cryolite addition volume, just offset the volume shrinkage that the molten liquid phase produced, the repair effect reaches the best, can keep repairing the outward appearance state before the point burns, the effect of repairing is better, there is not obvious repair trace. The cryolite of comparative example 3 was added to 20 parts, the firing expansion was 1.6%, the surface of the repaired part was raised, and due to the expansion, cavities were easily formed inside, which resulted in unacceptable thermal shock resistance.

The above examples are only intended to further illustrate the ceramic repair material and the ceramic repair method of the present invention, but the present invention is not limited to the examples, and any simple modification, equivalent change and modification made to the above examples according to the technical spirit of the present invention fall within the scope of the technical solution of the present invention.