阅读说明：本技术 一种陶瓷修补底料、修补面釉及制备方法和陶瓷修补方法 (Ceramic repair bottom material, repair surface glaze, preparation method and ceramic repair method ) 是由 林孝发 林孝山 闵卫 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种陶瓷修补底料,其由如下修补底料组合物混合精炼为团状；修补底料组合物按如下重量份包括：底料干粉100份、水13-20份和羧甲基纤维素钠5-12份；底料干粉按如下重量百分比含量包括：石英25-35％、废瓷粉34-44％、莫来石16-26％和硅酸锆8-12％。该陶瓷修补底料适用于低温快烧的环保工艺,烧成后体积收缩小不易产生裂纹,可修补的创面范围广。(The invention discloses a ceramic repair backing material, which is prepared by mixing and refining the following repair backing material composition into a dough; the repair backing material composition comprises the following components in parts by weight: 100 parts of backing material dry powder, 13-20 parts of water and 5-12 parts of sodium carboxymethylcellulose; the base material dry powder comprises the following components in percentage by weight: 25-35% of quartz, 34-44% of waste porcelain powder, 16-26% of mullite and 8-12% of zirconium silicate. The ceramic repair backing material is suitable for the environment-friendly process of low-temperature quick firing, the volume shrinkage is small after firing, cracks are not easy to generate, and the range of the repairable wound surface is wide.)

1. A ceramic repair backing material is characterized in that: the repairing base material composition is mixed and refined into a dough;

the repair backing material composition comprises the following components in parts by weight: 100 parts of backing material dry powder, 13-20 parts of water and 5-12 parts of sodium carboxymethylcellulose;

wherein, the base material dry powder comprises the following components in percentage by weight: 25-35% of quartz, 34-44% of waste porcelain powder, 16-26% of mullite and 8-12% of zirconium silicate.

2. A preparation method of ceramic repair overglaze is characterized in that: the method comprises the following steps:

weighing the following components in percentage by weight: 89-95% of glaze, 1-3% of zinc oxide and 2-9% of frit are sintered at one time, and are prepared into a repair overglaze composition;

grinding the repair overglaze composition by a ball mill, and sieving and drying the repair overglaze composition into overglaze dry powder;

weighing 50-70 parts of dry powder of the overglaze, and calcining at low temperature to obtain presintered dry powder of the overglaze, wherein the calcining temperature range is 1000-1050 ℃;

and mixing the pre-sintered dry overglaze powder with 30-50 parts of dry overglaze powder, a plurality of water and glycerol to obtain the repair overglaze.

3. A ceramic repair overglaze is characterized in that: a repair glaze prepared according to the method of claim 2.

4. A method of repairing a ceramic, comprising: the repair backing material of claim 1 is adopted to carry out filling repair on the defect of the ceramic body; the repairing method comprises the following steps:

polishing the defect part, and cleaning dust and particles on the surface of the wound;

filling and compacting the repair primer at the defect;

after firing, the repair backing material is tightly combined with the ceramic body.

5. The method of claim 4, wherein: and polishing the defect part of the ceramic blank to form a V-shaped groove.

6. The method of claim 4, wherein: further employing the repair overglaze of claim 3 to repair a surface at the defect;

filling the repair overglaze on the surface of the defect part before sintering after blank repair, and making the surface of the repair overglaze higher than the overglaze layer of the ceramic body after filling;

after firing, the repair overglaze is tightly combined with the overglaze layer of the ceramic body.

Technical Field

The invention relates to the field of ceramic manufacturing, in particular to a ceramic repair primer, a repair overglaze, a preparation method and a ceramic repair method.

Background

At present, a repairing material for repairing cracked sanitary ware is required not to shrink after being fired so as to ensure that the defect of the sanitary ware can be completely flat, smooth and crack-free after being fired, and the repairing material is required to have lower firing temperature. If a large amount of flux raw materials such as feldspar, clinker, zinc oxide, talc, glaze powder and the like in a molten state are added into the repairing material to realize the porcelain, the shrinkage ratio after sintering is large, cracking is easy to occur, and the repairing effect is poor due to the large addition amount of the flux components in the formula. In addition, the repair backing material is filled in the defect position of the sanitary appliance section by section, and if the shrinkage volume is too large, the condition that the repair backing material is pulled apart from section to section can also occur, so that the repair effect can not be ensured. Therefore, the wound surface range which can be repaired by the conventional repair backing material adopting the formula is limited, and only the defects of the width of the crack wound surface being less than 1mm and the length of the crack being less than 20mm can be repaired.

Further, the problem of large shrinkage volume can be overcome by adding the kyanite into the formula, namely, the shrinkage volume of the flux component in the porcelain forming process is counteracted by utilizing the expansion characteristic of the kyanite at a limited high temperature, so that the cracks generated after repairing are reduced.

However, in consideration of environmental protection process, the prior art mostly adopts a low-temperature fast-firing mode; when the re-sintering temperature is lower than 1200 ℃, the expansion rate of the kyanite is reduced, the shrinkage volume of the flux component in the porcelain process cannot be completely counteracted, cracks still appear after sintering, and the ideal repairing effect cannot be achieved.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a ceramic repair backing material which is suitable for an environment-friendly process of low-temperature quick firing, has small volume shrinkage after firing, is not easy to generate cracks, and has wide repairable wound surface range; also provides a preparation method of the ceramic repair overglaze, and the preparation method is simple and easy to operate; the repair overglaze prepared by the method has good repair effect and small shrinkage ratio; in addition, the ceramic repairing method is simple and easy to operate, and the repairing effect is ideal.

In order to achieve the purpose, the invention adopts the following technical scheme:

the first technical scheme relates to a ceramic repair backing material, which is prepared by mixing and refining the following repair backing material composition into a dough; the repair backing material composition comprises the following components in parts by weight: 100 parts of backing material dry powder, 13-20 parts of water and 5-12 parts of sodium carboxymethylcellulose; wherein, the base material dry powder comprises the following components in percentage by weight: 25-35% of quartz, 34-44% of waste porcelain powder, 16-26% of mullite and 8-12% of zirconium silicate.

The second technical scheme relates to a preparation method of a ceramic repair overglaze, which comprises the following steps: weighing the following components in percentage by weight: 89-95% of glaze, 1-3% of zinc oxide and 2-9% of frit are sintered at one time, and are prepared into a repair overglaze composition; grinding the repair overglaze composition by a ball mill, and sieving and drying the repair overglaze composition into overglaze dry powder; weighing 50-70 parts of dry powder of the overglaze, and calcining at low temperature to obtain presintered dry powder of the overglaze, wherein the calcining temperature range is 1000-1050 ℃; and mixing the pre-sintered dry overglaze powder with 30-50 parts of dry overglaze powder, a plurality of water and glycerol to obtain the repair overglaze.

The third technical scheme relates to a ceramic repair overglaze which is prepared by the method according to the second technical scheme.

The fourth technical scheme relates to a ceramic repairing method, which adopts the repairing bed charge of the first technical scheme to fill and repair the defect part of the ceramic body; the repairing method comprises the following steps: polishing the defect part, and cleaning dust and particles on the surface of the wound; filling and compacting the repair primer at the defect; after firing, the repair backing material is tightly combined with the ceramic body.

Based on the fourth technical scheme, a fifth technical scheme is further provided, and in the fifth technical scheme, the defect position of the ceramic body is polished into a V-shaped groove.

On the basis of the fourth technical scheme, a sixth technical scheme is further provided, wherein in the sixth technical scheme, the surface glaze is further repaired according to the third technical scheme so as to repair the surface of the defect; filling the repair overglaze on the surface of the defect part before sintering after blank repair, and making the surface of the repair overglaze higher than the overglaze layer of the ceramic body after filling; after firing, the repair overglaze is tightly combined with the overglaze layer of the ceramic body.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

1. the bottom material repairing composition adopts sodium carboxymethylcellulose as a main ceramic component, and the crystal component of the ceramic mainly comprises solid particle materials such as waste ceramic powder, quartz, mullite and the like. Based on the characteristic of low fire resistance of the sodium carboxymethyl cellulose, in the firing process, organic matters in the sodium carboxymethyl cellulose can be decomposed and a small amount of melt liquid with sodium ions can be remained after volatilization, the melt liquid is utilized to wrap and bond solid particle materials such as quartz, mullite, waste ceramic powder and the like so as to generate a co-melting vitreous body, the overall strength after repair is enhanced by the vitrification effect, and the vitreous body can be tightly bonded with a repaired blank body and is not easy to peel. In addition, the repair backing material is suitable for the environment-friendly process of low-temperature quick firing, the required re-firing temperature is lower, and the good vitrification effect can be achieved at the general re-firing temperature of 1150-sand 1180 ℃.

Based on the characteristic of high dispersibility of the sodium carboxymethyl cellulose, the sodium carboxymethyl cellulose with a very small amount can be used for wrapping more solid particle materials, so that the addition amount of a flux component can be greatly reduced, the generation of a eutectic substance is further reduced, the volume shrinkage of the flux component after sintering is controlled, the range of the repairable wound surface is expanded, and the repairing effect is ideal; compared with the conventional repair backing material, the repair backing material needs to add a large amount of flux components to achieve the porcelain effect, and the problem of overlarge volume shrinkage is caused. In conclusion, compared with the conventional repair backing material, the repair backing material disclosed by the application has a larger repairable wound surface range, and can obtain a good repair effect on cracks with the width of the crack wound surface being less than 8mm, the depth of the crack wound surface being less than 8mm and the length of the crack being less than 70 mm.

Wherein, the backing material dry powder comprises quartz, waste porcelain powder, mullite, zirconium silicate and other high-temperature resistant materials, the shrinkage is not easy to generate in the high-temperature sintering process, and the volume shrinkage after sintering is further reduced because the addition amount of the flux component is reduced. Wherein, the mullite is used for improving the thermal shock resistance of the repair backing material, and the mullite component can be extracted from the waste kiln furniture, thereby recycling the waste and reducing the material preparation cost. The waste porcelain powder is burnt once, and the contraction ratio of the waste porcelain powder after secondary burning is small; and the waste porcelain powder is mainly used as a framework material, and the main characteristics of the waste porcelain powder are consistent with those of a blank body to be repaired. The quartz is used for improving the thermal expansion coefficient of the repair backing material so as to make up the reduced thermal expansion coefficient after the mullite is added, and further ensure the stable performance of the repair backing material. Zirconium silicate is used as a thermal shock resistant auxiliary material for improving the thermal shock resistance and the crack resistance of the repair backing material, and ultrafine particles of zirconium silicate are used for filling gaps among other solid particle materials so as to improve the compactness of the repair backing material.

After the repairing base material composition is mixed and refined into a dough, the adhesiveness and the ductility of the repairing base material composition are enhanced, so that the gap between the repairing base material and a blank body can be reduced by extruding the repairing base material after the repairing base material is filled in the defect, the filling effect is achieved, the associativity is good, and the density is high.

2. In the preparation method of the ceramic repair overglaze, part of dry overglaze powder is weighed and calcined at low temperature, so that the moisture and decomposition products in the dry overglaze powder are dehydrated or decomposed in advance to obtain pre-sintered dry overglaze powder; mixing the pre-sintered dry powder of the overglaze with the dry powder of the overglaze which is not pre-sintered, water and glycerol to prepare the repair overglaze; in the process of repairing and sintering the repair overglaze, the proportion of shrinkage of the repair overglaze in the process of sintering can be reduced because the pre-sintering overglaze dry powder in the components is pre-sintered once, the repair overglaze is not easy to peel off from the overglaze layer of the ceramic body after being repaired, the cracks are few, and the repair effect is ideal.

3. The ceramic repairing method adopts the repairing bed charge to fill and repair the defect of the ceramic body, and based on the characteristics of the repairing bed charge, the repairing method can repair the defect of a larger wound surface, the repaired position is not easy to crack, the surface is smooth and flat, and the bonding effect is good and is not easy to fall off. The modification method is suitable for a low-temperature environment-friendly process, the repair backing material can achieve a good vitrification effect when the re-burning temperature is 1150-sand 1180 ℃, and the whole repair effect is ideal and stable. The ceramic repairing method is simple and easy to operate, and can be operated by conventional facilities.

4. Polishing the defect part of the ceramic blank into a V-shaped groove so as to ensure that the shrinkage directions of the repair backing material filled in the V-shaped groove are consistent and reduce the generation of cracks; the V-shaped groove is convenient for filling the repair backing material, the required filling space is small, and the use cost of the repair backing material is reduced.

5. In the method for repairing the ceramic, the surface glaze for repairing the defect is adopted to repair the surface of the defect, the repaired surface glaze is tightly combined with the surface glaze layer of the defect, the repairing position is in smooth transition without cracks, and the repairing effect is ideal. And because the co-molten material generated after the sintering of the repair primer is less, a small amount of micro gaps are remained in the sintered repair primer, and the formed micro gaps can form capillary force in the sintering process of the repair overglaze, so that the repair overglaze can be absorbed and permeated into the micro gaps, a compact intermediate transition layer is formed between the repair primer and the repair overglaze, and the bonding effect among the repair primer, the repair overglaze and the ceramic body is enhanced.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and more obvious, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention provides a ceramic repair primer, which is refined into a dough shape by the following primer composition;

the repairing primer composition comprises the following components in parts by weight: 100 parts of backing material dry powder, 13-20 parts of water and 5-12 parts of sodium carboxymethylcellulose; the base material dry powder comprises the following components in parts by weight: 25-36% of quartz, 34-44% of waste porcelain powder, 16-26% of mullite and 8-12% of zirconium silicate.

Wherein, the backing material dry powder comprises quartz, waste porcelain powder, mullite, zirconium silicate and other high-temperature resistant materials, the shrinkage is not easy to generate in the high-temperature sintering process, and the volume shrinkage after sintering is further reduced because the addition amount of the flux component is reduced. Wherein, the mullite is used for improving the thermal shock resistance of the repair backing material, and the mullite component can be extracted from the waste kiln furniture, thereby recycling the waste and reducing the material preparation cost. The waste porcelain powder is burnt once, and the contraction ratio of the waste porcelain powder after secondary burning is small; and the waste porcelain powder is mainly used as a framework material, and the main characteristics of the waste porcelain powder are consistent with those of a blank body to be repaired. The quartz is used for improving the thermal expansion coefficient of the repair backing material so as to make up the reduced thermal expansion coefficient after the mullite is added, and further ensure the stable performance of the repair backing material. Zirconium silicate is used as a thermal shock resistant auxiliary material for improving the thermal shock resistance and the crack resistance of the repair backing material, and ultrafine particles of zirconium silicate are used for filling gaps among other solid particle materials so as to improve the compactness of the repair backing material.

Specifically, the preparation method of the ceramic repair backing material comprises the following steps:

weighing the following components in percentage by weight for proportioning: 25-36% of quartz, 34-44% of waste porcelain powder, 16-26% of mullite and 8-12% of zirconium silicate; mixing the ingredients with water according to the proportion of 100: adding the mixture into a ball mill according to the proportion of 50, mixing and ball-milling the mixture to obtain slurry after ball-milling treatment; and (3) sieving the slurry by a 120-mesh sieve, wherein the balance of the sieve accounts for 3-7.5% of the total dry powder, then putting the sieved slurry into a drying box, and drying to obtain the backing material dry powder.

Mixing and refining the backing material dry powder, water and sodium carboxymethylcellulose into a dough according to the following parts by weight: 100 parts of backing material dry powder, 13-20 parts of water and 5-12 parts of sodium carboxymethylcellulose; thus obtaining the repair backing material. Wherein, the adopted sodium carboxymethyl cellulose is sodium carboxymethyl cellulose colloid with the concentration of 7 percent.

The invention also provides a preparation method of the ceramic repair overglaze, which comprises the following steps:

the components are weighed according to the following weight percentage, 89-95 percent of glaze material which is sintered at one time, 1-3 percent of zinc oxide and 2-9 percent of frit are prepared into a repairing overglaze composition; wherein the primary firing glaze is glaze slurry for primary firing; the frit is conventional transparent frit, and the components of the frit are similar to those of the once-fired glaze; the zinc oxide is used for reducing the maturation temperature of the once-fired glaze, so that the re-firing temperature can be reduced by 20-40 ℃ compared with the once-fired temperature.

Grinding the repair overglaze composition by a ball mill, and sieving and drying the repair overglaze composition into overglaze dry powder;

weighing 50-70 parts of dry powder of the overglaze, and calcining at low temperature to obtain presintered dry powder of the overglaze, wherein the calcining temperature range is 1000-1050 ℃; that is, the water or decomposition products in the glaze base material are dehydrated or decomposed in advance during the low-temperature calcination process to reduce the volume shrinkage ratio of the whole glaze base material during the calcination process.

And mixing the pre-sintered dry overglaze powder with 30-50 parts of dry overglaze powder, a plurality of water and glycerol to obtain the repair overglaze.

The repair overglaze prepared by the preparation method of the ceramic repair overglaze is not completely composed of the dry powder of the overglaze which is not pre-calcined, and also comprises part of the pre-sintered dry powder of the overglaze which is pre-calcined once, so that compared with the conventional ceramic repair overglaze, the ceramic repair overglaze prepared by the method has the advantages that the glaze shrinkage proportion is reduced in the sintering process, the problems of glaze cracking and the like are avoided, the repair overglaze is not easy to peel off from the overglaze layer of the blank, the cracks are few, and the repair effect is ideal.

The invention also provides a method for repairing ceramics, which adopts the prepared repair primer to fill and repair the defect of the ceramic body and the prepared repair overglaze to repair the surface of the defect; specifically, the ceramic repairing method comprises the following steps:

adopting a vibration pen to properly open the cracks at the defect positions, and polishing the cracks into V-shaped grooves; the V-shaped groove enables the shrinkage directions of the repair backing materials filled in the groove to be consistent, and reduces cracks generated after firing; the V-shaped grooves are convenient for filling the repair backing material, the required filling space is small, and the using amount of the repair backing material is reduced.

The dust on the wound surface is cleaned by compressed air, and the residual powder particles and other particles on the surface of the wound surface are blown off.

Filling and compacting the repair primer at the defect;

the electric hair drier is adopted to align the repair backing material filled in the defect position for rapid drying;

after the repair backing material is completely dried, polishing the redundant repair backing material by using sand paper so as to enable the surface of the repair backing material to be flush with the surface of the green body layer of the ceramic body; and blowing off redundant powder on the surface by adopting compressed air;

filling the repair overglaze on the surface of the defect, and enabling the surface of the repair overglaze to be higher than the overglaze layer of the ceramic blank after filling, wherein the height range of the height of the repair overglaze is 0.2-0.6 mm;

re-burning the repair backing material, the repair overglaze and the ceramic blank at 1150-sand 1180 ℃; in this embodiment, the reburning temperature is 1165 ℃; after sintering, the repair backing material is tightly combined with the green body layer of the ceramic green body, and the repair overglaze is tightly combined with the overglaze layer of the ceramic green body, so that the ceramic green body is durable and is not easy to crack again after being repaired; and the repairing position is smooth and flat without cracks, and the repairing effect is ideal.

Specifically, in the firing process, the repair backing material adopts sodium carboxymethylcellulose as a main porcelainizing component, and the crystalline component of the porcelain mainly comprises solid particle materials such as waste porcelain powder, quartz, mullite and the like. Based on the low fire-resistant characteristic of the sodium carboxymethyl cellulose, in the firing process, organic matters in the sodium carboxymethyl cellulose can be decomposed and remain a small amount of melt liquid with sodium ions after being volatilized, the melt liquid is utilized to wrap and bond solid particle materials such as quartz, mullite and waste ceramic powder to generate a small amount of co-melted glass body, the vitrification effect is achieved to enhance the overall strength after repair, and the ceramic body can be tightly bonded with the repaired body and is not easy to peel off, so that the vitrification effect between a repair backing material and the defect of the ceramic body is realized.

In addition, because the co-molten materials generated after the sintering of the repair backing material are less, a small amount of micro gaps can be remained in the sintering of the repair backing material, and the formed micro gaps can form capillary force in the sintering process of the repair overglaze, so that the repair overglaze can be absorbed and permeated into the micro gaps, a compact intermediate transition layer is formed between the repair backing material and the repair overglaze, and the bonding effect between the repair backing material, the repair overglaze and the ceramic body is enhanced.

TABLE 1 comparative table of the ratio of each component and the repairing effect of the first set of test examples

Specifically, as shown in table 1, the present embodiment provides a first set of test examples 1 to 8 to illustrate the repair effect that can be achieved by different proportions of the repair primer. Except for different proportions of the backing material dry powder, water and sodium carboxymethylcellulose, the preparation methods and the processes of the backing material in the experimental examples 1 to 8 are the same; and the crack defects with the wound surface width less than 8mm, the wound surface depth less than 8mm and the wound surface length less than 70mm are repaired by uniformly adopting the repairing method.

Referring to the repairing effect descriptions of the test examples 3, 4, 5 and 6 in the table 1, it can be shown that if the compounding ratio range of the repairing primer composition is 100 parts of primer dry powder, 13-29 parts of water and 5-12 parts of sodium carboxymethyl cellulose, the repairing primer refined into a dough shape has good viscosity and is easy to agglomerate, and filling and repairing are facilitated; in addition, better porcelainization can be realized between the repair backing material and the green body in the firing process, and the integral strength and bonding effect after sintering are improved; in addition, only a small amount of eutectic substances are generated in the firing process, so that the shrinkage ratio of the whole fired ceramic body is small, the repairing position is smooth and flat without cracks, and the repairing effect is ideal. Therefore, it can be confirmed that the repair primer applied in the range of the compounding ratio has the best repair effect.

However, the comparison of the repairing effects of test examples 1 and 2 shows that when the water content in the primer composition is too small, the adhesion of the primer is good, but some cracks are generated after firing, and the repairing effect is general; according to the comparison of the repairing effects of the test examples 7 and 8, it is demonstrated that when the water content ratio in the primer composition is too high, the primer composition is poor in viscosity and not likely to agglomerate during the refining process, so that the repair using the primer composition is difficult and the repairing effect is poor. Therefore, it is further proved that the optimal blending ratio range of the repair primer in the embodiment is as follows: 100 parts of backing material dry powder, 13-29 parts of water and 5-12 parts of sodium carboxymethylcellulose.

In the embodiment, because the sodium carboxymethylcellulose in the repair backing material composition has the characteristic of high dispersibility, more solid particle materials can be wrapped by using a very small amount of sodium carboxymethylcellulose, so that the addition amount of the flux component can be greatly reduced, the generation of eutectic substances is further reduced, the volume shrinkage of the flux component after sintering is controlled, the range of the repairable wound surface is expanded, and the repair effect is ideal; compared with the conventional repair backing material, the repair backing material needs to add a large amount of flux components to achieve the porcelain effect, and the problem of overlarge volume shrinkage is caused.

In summary, compared with the conventional repair primer, the repair primer provided by the embodiment has a larger repairable wound surface range, and can achieve a good repair effect on cracks with a crack wound surface width of less than 8mm, a crack wound surface depth of less than 8mm, and a crack length of less than 70 mm.

TABLE 2 table of distribution ratios of respective components of the second test example and the comparative example

Specifically, as shown in table 2, the present embodiment provides a second set of test examples 1-3, and the repair primer compositions in the second set of test examples 1-3 each include 100 parts of dry primer powder, 15 parts of water, and 10 parts of sodium carboxymethylcellulose, wherein the weight percentages of the components of the dry primer powder in each test example are shown in the content of table 2. This embodiment also provides comparative example 1, which is a conventional repair primer using a large amount of flux component, as compared with the second set of test examples, and the weight percentages of the components are also shown in table 2.

TABLE 3 comparison of repairing effect of the second set of test examples and comparative examples under different conditions

Specifically, as shown in table 3, in the present embodiment, the repair positions of the test examples and the comparative examples in the second group were not cracked under the thermal shock resistance temperature difference of 110 ℃ and the autoclave test condition of 1Mpa +1 hour; namely, the porcelain effect of each test example in the second group of test examples is good, and the strength standard of the conventional repair backing material in the comparative example 1 can be achieved.

The repairing effect of the second group of test examples and comparative example 1 can be good and bad aiming at the defects with different degrees, wherein, if the defects with the width of the wound surface of 1-2mm are repaired, no crack occurs at the repairing positions in the comparative example 1 and each test example 1-4; if the defect with the width of the wound surface of 2-5mm is repaired, the repair position of the comparative example 1 has local cracks, and the repair positions of the test examples 1-4 have no cracks; if a defect with a wound width of 5-8mm is repaired, the repair site of comparative example 1 has a severe crack, while the repair sites of each of test examples 1-4 still have no crack.

By comparing the repairing effects of the comparative example 1 and the second group of test examples under different conditions, the component proportion of the base material dry powder in each test example in the embodiment is proper, and after the base material dry powder acts with a small amount of sodium carboxymethyl cellulose, a good ceramic effect can be realized, and the overall strength after repairing is effectively ensured; compared with the conventional repair backing material, the repair backing material has the advantages that the range of the repaired wound surface is larger, the repair effect is excellent, and the repair backing material, the repair overglaze and the ceramic blank are tightly combined and are not easy to peel; the surface glaze layer of the repair surface glaze and the ceramic body is in smooth transition, and the surface of the repair position is smooth, flat and crack-free.

In conclusion, the ceramic repair backing material provided by the embodiment is suitable for the low-temperature fast-firing environment-friendly process, the volume shrinkage after firing is small, cracks are not easy to generate, and the repairable wound surface range is wide; the preparation method of the ceramic repair overglaze is simple and easy to operate; the repair overglaze prepared by the method has good repair effect and small shrinkage ratio; in addition, the provided ceramic repairing method is simple and easy to operate, and has ideal repairing effect.

The above description describes preferred embodiments of the invention, but it should be understood that the invention is not limited to the above embodiments, and should not be viewed as excluding other embodiments. Modifications made by those skilled in the art in light of the teachings of this disclosure, which are well known or are within the skill and knowledge of the art, are also to be considered as within the scope of this invention.