High-hardness anti-scratch ceramic tile and production process thereof

Abstract

The invention relates to the technical field of architectural ceramics, and particularly discloses a high-hardness anti-scratch ceramic tile and a production process thereof. The invention relates to a high-hardness scratch-resistant ceramic tile which comprises a blank and glaze, the green body comprises the following components in parts by weight: 30-50 parts of kaolin, 20-40 parts of quartz sand, 10-30 parts of potassium feldspar, 1-3 parts of corundum micro powder, 10-20 parts of silicon carbide whiskers, 0.5-1 part of sodium lignin sulfonate and 3-6 parts of water glass; the glaze is prepared from the following raw materials in parts by weight: 15 to 45 parts of spodumene, 5 to 15 parts of quartz sand, 5 to 10 parts of potassium feldspar, 1 to 3 parts of nano diamond and 1 to 3 parts of zinc oxide. The Moh's hardness of the high-hardness anti-scratch ceramic tile obtained by the invention reaches 5 grades at most, the fracture modulus and the breaking strength are 56.9 MPa and 2019N at most, the abrasion loss is 4.0 cm < 3 > at least, the hardness of the ceramic tile is improved, and the ceramic tile has high anti-scratch performance.

Description

Technical Field

[0001] The present application relates to the field of building ceramics, and more specifically, to a high-hardness scratch-resistant ceramic tile and a production process thereof. Background Art

[0002] As the architectural decoration industry continues to demand higher performance from ceramic tiles, surface hardness has become a key indicator of tile quality. Traditional tiles made from clay, quartz, and falling clay typically have a Mohs hardness of 5-6 after high-temperature sintering, making them vulnerable to scratches from metal tools, gravel, and other hard objects. This is particularly evident in high-frequency use environments like shopping malls and airports, where surface scratches and gloss loss can be a significant issue, severely limiting the tiles' durability and decorative value.

[0003] In related technologies, in order to increase the hardness of tiles, alumina powder is added to the raw materials of tile blanks. Although the hardness of the tiles is improved, it will lead to higher sintering temperature, increased product brittleness, high energy consumption and high carbon emission pressure, which is difficult to meet actual usage needs. Summary of the Invention

[0004] In order to improve the hardness of ceramic tiles, the present application provides a high-hardness scratch-resistant ceramic tile and a production process thereof.

[0005] In a first aspect, the present application provides a high-hardness scratch-resistant ceramic tile, which adopts the following technical solution: A high-hardness, scratch-resistant ceramic tile comprises a blank and a glaze; the blank comprises the following raw materials in parts by weight based on the weight of the blank: 30-50 parts of kaolin, 20-40 parts of quartz sand, 10-30 parts of potassium feldspar, 1-3 parts of corundum powder, 10-20 parts of silicon carbide whiskers, 0.5-1 part of sodium lignin sulfonate, and 3-6 parts of water glass; Based on the weight of the glaze, the glaze includes the following raw materials in parts by weight: 15-45 parts of spodumene, 5-15 parts of quartz sand, 5-10 parts of potassium feldspar, 1-3 parts of nano-diamond, and 1-3 parts of zinc oxide.

[0006] By adopting the above solution, the flaky structure of kaolin can form a stable network in the green body, enhancing the green body's plasticity and strength, reducing the risk of tile cracking. During the high-temperature firing process, kaolin is converted into mullite, significantly improving the green body's mechanical strength and chemical stability. Furthermore, at high temperatures, kaolin reacts with fluxes such as feldspar to form a glass phase, which promotes the sintering of the green body, thereby reducing the firing temperature and saving energy costs. Furthermore, kaolin has a low thermal expansion coefficient and can synergize with raw materials such as quartz sand and feldspar to optimize the overall thermal expansion properties of the green body and reduce stress cracking during the firing process.

[0007] Adding quartz sand as hard particles dispersed throughout the green body creates a rigid skeleton structure, significantly increasing the green body's compressive strength. Furthermore, quartz sand inhibits shrinkage and deformation during the drying and firing processes, reducing the risk of cracking.

[0008] Corundum powder significantly increases the hardness of the tile, but the proportion must be controlled to prevent excessive sintering temperatures and increased brittleness. Silicon carbide whiskers can be evenly dispersed throughout the tile, significantly improving the tile's scratch resistance and hardness. The combined addition of corundum powder and silicon carbide whiskers creates a synergistic "hard surface + tough matrix" effect, further enhancing the tile's hardness.

[0009] The addition of sodium lignin sulfonate has a steric hindrance effect, which can improve the dispersion stability of the various raw materials of the tile body. Water glass can also prevent the agglomeration of the various raw materials of the tile body. Sodium lignin sulfonate gives the tile body raw materials a negative charge. Water glass further increases the negative charge density on the particle surface, more effectively preventing agglomeration and improving the dispersion of the various raw materials of the tile body.

[0010] The spodumene in the glaze significantly lowers the melting temperature of the glaze, promotes uniform melting of the glaze at low temperature, reduces bubbles and pinholes caused by high-temperature volatilization, makes the glaze layer more uniform, reduces energy consumption, adapts to low-temperature fast-firing technology, and reduces the risk of deformation of the body at high temperature. The thermal expansion coefficient of spodumene is low, which reduces cracking or peeling of the glaze surface.

[0011] The silica network formed after the addition of molten quartz gives the glaze layer high hardness and wear resistance. Under slow cooling conditions, cristobalite or tridymite microcrystals may precipitate in the glaze, further improving the surface hardness.

[0012] The addition of nanodiamonds increases the hardness of the tile. After sintering, they can become hard points in the glaze layer, significantly improving the hardness of the glaze layer. Nanodiamonds can also refine the glaze's grain size, increase the number of grain boundaries, hinder dislocation movement and crack propagation, and thus increase the hardness of the tile.

[0013] Adding zinc oxide generates zinc spinel, promotes the formation of anorthite, and increases the hardness of the glaze surface. It also inhibits grain growth, increases the density of the glaze surface, and thus improves the hardness of the tile. Furthermore, zinc oxide reduces the viscosity of the glaze, improves its fluidity, and has a certain dispersing effect on nanodiamonds, further enhancing their hardness-enhancing effect in the glaze.

[0014] Preferably, a high-hardness scratch-resistant ceramic tile comprises, based on the weight of the green body, the following raw materials in parts by weight: 35-45 parts of kaolin, 25-35 parts of quartz sand, 15-25 parts of potassium feldspar, 1.5-2.5 parts of corundum powder, 13-17 parts of silicon carbide whiskers, 0.7-0.9 parts of sodium lignin sulfonate, and 4-5 parts of water glass; Based on the weight of the glaze, the glaze includes the following raw materials in parts by weight: 20-30 parts of spodumene, 7-12 parts of quartz sand, 7-9 parts of potassium feldspar, 1.5-2.5 parts of nanodiamond, 5-7 parts of zirconium silicate, and 1.5-2.5 parts of zinc oxide.

[0015] The high-hardness scratch-resistant ceramic tiles of this application are made of 35-45 parts of kaolin, 25-35 parts of quartz sand, 15-25 parts of potassium feldspar, 1.5-2.5 parts of corundum powder, 13-17 parts of silicon carbide whiskers, 0.7-0.9 parts of sodium lignin sulfonate, and 4-5 parts of water glass. The glaze is made of 20-30 parts of spodumene, 7-12 parts of quartz sand, 7-9 parts of potassium feldspar, 1.5-2.5 parts of nanodiamond, 5-7 parts of zirconium silicate, and 1.5-2.5 parts of zinc oxide. The performance of the ceramic tiles is predictable and they all have high hardness.

[0016] As a preference: the corundum micropowder is prepared by modification, specifically: S1. Adding corundum powder to a nitric acid solution with a mass concentration of 15%, reacting at 65-75° C. for 140-160 minutes, filtering, washing until neutral, and drying to obtain pretreated corundum powder; S2, dissolving zirconium oxychloride in deionized water, adjusting the pH to 1-2, and adding polyvinyl alcohol to obtain a zirconium oxychloride sol; S3. Immerse the pretreated corundum micropowder in zirconium oxychloride sol, disperse it by ultrasonication, dry it, and calcine it at 500-600° C. for 1-3 hours to obtain modified corundum micropowder.

[0017] The mass ratio of the corundum micropowder to the nitric acid solution is 1:0.5; the amount of the zirconium oxychloride is 10-30% of the total mass of the zirconium oxychloride sol; the amount of the polyvinyl alcohol is 1-3% of the total mass of the zirconium oxychloride sol; and the amount of the deionized water is 60-80% of the total mass of the zirconium oxychloride sol.

[0018] By adopting the above scheme, the corundum micropowder is immersed in the zirconium oxychloride sol to achieve zirconium oxide coating of the corundum micropowder, forming a high-hardness and high-stability inorganic coating on the surface of the corundum micropowder, further improving the hardness of the corundum micropowder, thereby improving the hardness of the ceramic tile.

[0019] The corundum powder is first soaked in nitric acid for acidification pretreatment, removing surface impurities and increasing hydroxyl active sites, enhancing the bonding strength of the subsequent zirconium oxide coating. Zirconium oxychloride is dissolved in deionized water and then added with polyvinyl alcohol. This steric hindrance enhances the stability of the zirconium oxychloride sol and improves the uniformity of the zirconium oxide coating.

[0020] Preferably, the mass ratio of the zirconium oxychloride sol to the pretreated corundum powder is 1:(1-3).

[0021] By adopting the above scheme and adjusting the mass ratio of zirconium oxychloride to corundum micropowder, the uniformity of the zirconium oxide coating can be improved, the coating effect can be enhanced, and the hardness of the corundum micropowder can be further increased.

[0022] Preferably, the drying is followed by aging treatment, the aging temperature is 25-30° C., and the aging time is 8-14 h.

[0023] By adopting the above scheme, the dried corundum micropowder is aged, and the aging temperature and time are controlled to promote the stability of the sol network structure, improve the coating effect, and further improve the hardness of the tile.

[0024] Preferably, the glaze further comprises 0.5-1 parts by weight of yttrium oxide.

[0025] By adopting the above scheme, yttrium oxide can form a high-hardness crystal phase, promote the densification of the glaze, reduce voids, and increase the hardness of the surface glaze layer. Its fluxing effect with zinc oxide can optimize the fluidity of the glaze and make the yttrium oxide more evenly dispersed. 3 + through charge compensation with Zn 2 + Form solid solution, enhance grain boundary bonding, reduce porosity, thereby increasing overall density and further improving the hardness of the tile.

[0026] Preferably, the weight ratio of yttrium oxide to zinc oxide is 1:(2-4).

[0027] By adopting the above scheme, the weight ratio of yttrium oxide to zinc oxide is adjusted, the dispersibility of yttrium oxide in the glaze is further improved, and the hardness of the ceramic tile is further improved.

[0028] In a second aspect, the present application provides a production process for any of the above-mentioned high-hardness scratch-resistant tiles, which is specifically achieved through the following technical solutions: A production process for high-hardness scratch-resistant ceramic tiles comprises the following steps: grinding raw materials of a green body, passing through a 100-300 mesh sieve, pressing into shape, maintaining the temperature at 600°C for 10 hours, heating to 1000°C for 1 hour, further heating to 1400°C for firing for 3 hours, cooling, edge grinding, and polishing to obtain a green body; Mix all the raw materials of glaze, add water and ball grind to 325 mesh, sieve, and control the specific gravity of glaze slurry to 1.4-1.6g / cm 3 , rotary glaze is applied on the surface of the blank with a thickness of 0.1-0.3mm, dried at 80-120℃ for 10-20min, fired at 1050-1100℃ for 1-1.5h, cooled and polished to obtain anti-slip and anti-fouling tiles.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. This application controls the types and amounts of raw materials in the ceramic tile body and glaze, so that the modulus of rupture and the breaking strength of the ceramic tile are 50.5-51.2MPa and 1978-1982N respectively, and the wear volume is 5.5-5.6cm3, thereby improving the hardness of the ceramic tile and making the ceramic tile have higher scratch resistance.

[0030] 2. This application modifies the corundum powder in the raw materials of the ceramic tile body and adjusts the modification method and the dosage of each raw material to make the fracture modulus and breaking strength of the ceramic tile 53.6-54.8MPa and 1994-1998N respectively, and the wear amount is 4.7-4.9cm3, thereby further improving the hardness of the ceramic tile.

[0031] 3. This application further improves the hardness of the tile by adding yttrium oxide to the raw material of the tile body and controlling the weight ratio of yttrium oxide to zinc oxide, so that the rupture modulus and breaking strength of the tile are 56.9MPa and 2019N respectively, and the wear amount is 5.5-5.6cm3. DETAILED DESCRIPTION

[0032] The following is a detailed description of the present application in conjunction with specific examples. The following raw materials in the present application are all commercially available products, which are provided to fully disclose the raw materials of the present application and should not be construed as limiting the sources of the raw materials. Specifically: kaolin, particle size is 325 mesh; quartz, particle size is 100 mesh; feldspar, particle size is 200 mesh; silicon carbide, particle size is 40nm; high-alumina bauxite, particle size is 325 mesh; hexagonal boron nitride, particle size is 300 mesh; spodumene, particle size is 120 mesh; alumina micropowder, particle size is 200 mesh; wollastonite microcrystalline powder, particle size is 325 mesh; colemanite, boron content is about 40%, calcium content is about 27%, silicon content is about 5%, particle size is 200 mesh; tetrabutyl titanate, effective substance content is 99%; potassium cryolite fine powder, particle size is 200 mesh; magnesium aluminum spinel, particle size is 25μm; calcined zinc oxide, particle size is 325 mesh.

[0033] The following is an example of the preparation of modified corundum micropowder: Preparation Example 1 The modified corundum micropowder of Preparation Example 1 is specifically: S1. Add 10 kg of corundum powder to 8 L of 15% nitric acid solution, react at 70° C. for 150 min, filter, wash until neutral, and dry to obtain pretreated corundum powder; S2. Dissolve 200 g of zirconium oxychloride in 700 mL of deionized water, adjust the pH to 2, and add 20 g of polyvinyl alcohol to obtain 1 kg of zirconium oxychloride sol; S3. Immerse 0.8 kg of pretreated corundum micropowder in 1 kg of zirconium oxychloride sol, disperse by ultrasonication, dry, and calcine at 500-600° C. for 1-3 h to obtain modified corundum micropowder.

[0034] Preparation Example 2 The modified corundum powder of Preparation Example 2 has the same raw material types as Preparation Example 1, except that it is aged after drying, the aging temperature is 27°C, and the aging time is 10 hours. The steps are the same as Preparation Example 1.

[0035] Preparation Examples 3-6 The modified corundum micropowders of Preparation Examples 3-6 are exactly the same as those of Preparation Example 2 in terms of raw material types and preparation methods. The difference lies in the different dosages of pretreated corundum micropowder, specifically 1kg, 2kg, 3kg, and 3.5kg. The remaining steps are the same as those of Preparation Example 2.

[0036] Example 1 The high-hardness scratch-resistant ceramic tile of Example 1 is prepared by the following steps: According to the dosage of each raw material in Table 1, the raw materials of the green body were ground, passed through a 200-mesh sieve, pressed into shape, kept at 600°C for 10 hours, heated to 1000°C for 1 hour, and continued to heat to 1400°C for 3 hours. The green body was then cooled, edged, and polished to obtain the green body. According to the dosage of each raw material in Table 2, the raw materials of the glaze were mixed, ball-milled with water to 325 mesh, sieved, and the specific gravity of the glaze slurry was controlled at 1.5g / cm 3 , rotary glaze is applied on the surface of the blank with a thickness of 0.2mm, dried at 110℃ for 15min, fired at 1080℃ for 1.5h, cooled and polished to obtain high hardness scratch-resistant tiles.

[0037] Examples 2-5 The high-hardness scratch-resistant ceramic tiles of Examples 2-5 are prepared in the same manner and using the same raw materials as those of Example 1. The difference lies in the different amounts of the raw materials, as shown in Table 2.

[0038] Table 2 Amount of each raw material of the high hardness anti-scratch ceramic tile blank of Examples 1-5 (unit: kg) raw material Example 1 Example 2 Example 3 Example 4 Example 5 Kaolin 40 40 40 40 40 quartz sand 30 30 30 30 30 Potassium feldspar 20 20 20 20 20 Corundum powder 3 2 2 1 1 Silicon carbide whiskers 10 10 20 15 20 Sodium lignin sulfonate 0.8 0.8 0.8 0.8 0.8 water glass 5 5 5 5 5 Table 2 Amount of each raw material of the high hardness anti-scratch tile glaze of Examples 1-5 (unit: kg) Examples 6-11 The production process of the high-hardness scratch-resistant tiles of Examples 6-11 is the same as that of Example 3, except that the corundum micropowder in the glaze is the modified corundum micropowder prepared in Preparation Examples 1-6, and the types and dosages of other raw materials are the same as those in Example 3.

[0039] Examples 12-16 The production process of the high-hardness scratch-resistant tiles of Examples 12-16 is the same as that of Example 9, except that yttrium oxide is also added to the glaze, with specific dosages of 2kg, 1kg, 0.67kg, 0.5kg and 0.33kg. The types and dosages of other raw materials are the same as those of Example 9.

[0040] Comparative Example 1 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 1 is exactly the same as that of Example 1, except that an equal amount of corundum powder in the green body raw material is replaced by silicon carbide whiskers, and the remaining raw materials and dosages are the same as those of Example 1.

[0041] Comparative Example 2 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 2 is exactly the same as that of Example 1, except that an equal amount of silicon carbide whiskers in the green body raw material is replaced with corundum powder, and the remaining raw materials and dosages are the same as those of Example 1.

[0042] Comparative Example 3 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 3 is exactly the same as that of Example 1, except that an equal amount of water glass in the green body raw material is replaced by sodium lignin sulfonate, and the remaining raw materials and dosages are the same as those of Example 1.

[0043] Comparative Example 4 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 4 is exactly the same as that of Example 1, except that an equal amount of sodium lignin sulfonate in the green body raw material is replaced with water glass, and the remaining raw materials and dosages are the same as those of Example 1.

[0044] Comparative Example 5 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 5 is exactly the same as that of Example 1, except that an equal amount of nanodiamonds in the glaze raw materials is replaced by zinc oxide, and the remaining raw materials and dosages are the same as those of Example 1.

[0045] Comparative Example 6 The production process of the high-hardness scratch-resistant ceramic tiles of Comparative Example 6 is exactly the same as that of Example 1, except that an equal amount of zinc oxide in the glaze raw materials is replaced by nanodiamonds, and the remaining raw materials and dosages are the same as those of Example 1.

[0046] Performance testing The following testing standards or methods were used to perform performance tests on the tiles obtained from different Examples 1-16 and Comparative Examples 1-6. The test results are shown in Table 3.

[0047] Mohs hardness: Use a Mohs hardness tester to test the Mohs hardness of tiles.

[0048] Modulus of rupture: GB / T3810.4-2006 "Test methods for ceramic tiles - Part 4: Determination of modulus of rupture and breaking strength" is used to measure the modulus of rupture of ceramic tiles.

[0049] Destructive strength: GB / T3810.4-2006 "Test methods for ceramic tiles - Part 4: Determination of modulus of rupture and destructive strength" is used to measure the destructive strength of ceramic tiles.

[0050] Wear resistance: According to GB / T3810.7, the tiles were subjected to friction and wear tests on an MMS-1G high-speed pin-on-disc friction and wear testing machine, and the wear volume was recorded.

[0051] Table 3 Performance test results of different tiles The test results in Table 3 show that the Mohs hardness of the tiles obtained in this application reaches level 5, and the maximum rupture modulus and breaking strength are 56.9 MPa and 2019 N respectively, and the minimum wear loss is 4.0 cm 3 , which improves the hardness of the tiles and makes them more scratch-resistant.

[0052] Combined with the performance test data of the tiles of Examples 1-5, it was found that the modulus of rupture and the breaking strength of the tiles of Examples 2-4 were 50.5-51.2 MPa and 1978-1982 N, respectively, which were higher than those of Examples 1 and 5, and the wear loss was 5.5-5.6 cm 3 , which are lower than those in Example 1 and Example 5, indicating that the weight ratio of corundum powder to silicon carbide whiskers in the ceramic tile raw material is 1:(5-15), which is more appropriate, and improves the hardness of the ceramic tile and makes the ceramic tile have higher scratch resistance.

[0053] Combining the performance test data of the tiles of Example 6 and Example 3, it is found that the modulus of rupture and the breaking strength of the tiles of Example 6 are 51.7MPa and 1985N respectively, which are higher than those of Example 3, and the wear amount is 5.4cm 3 , which are lower than those in Example 3, indicating that the hardness of the tiles can be further improved by modifying the corundum powder in the raw materials of the tile body.

[0054] Combining the performance test data of the tiles of Example 7 and Example 6, it is found that the modulus of rupture and the breaking strength of the tiles of Example 7 are 52.3MPa and 1991N respectively, which are higher than those of Example 6, and the wear amount is 5.1cm 3 , which are lower than those in Example 6, indicating that the hardness of the tiles can be further improved by modifying the corundum powder in the raw materials of the tile body and performing aging treatment after drying.

[0055] Combined with the performance test data of the tiles of Examples 7-11, it was found that the modulus of rupture and the breaking strength of the tiles of Examples 8-10 were 53.6-54.8 MPa and 1994-1998 N, respectively, which were higher than those of Examples 7 and 11, and the wear loss was 4.7-4.9 cm 3 , which are lower than those in Example 7 and Example 11, indicating that the mass ratio of zirconium oxychloride sol to pretreated corundum powder in the corundum powder modification process is more appropriate at 1:(1-3), which improves the hardness of the ceramic tile and makes the ceramic tile have higher anti-scratch performance.

[0056] Combined with the performance test data of the ceramic tiles of Examples 12-16, it was found that the modulus of rupture and the breaking strength of the ceramic tiles of Examples 13-15 were 56.9 MPa and 2019 N, respectively, which were higher than those of Examples 12 and 16, and the wear amount was 5.5-5.6 cm 3 , which are lower than those in Example 12 and Example 16, indicating that adding yttrium oxide to the raw materials of the ceramic tile body and controlling the weight ratio of yttrium oxide to zinc oxide to be 1:(2-4) can improve the hardness of the ceramic tile and make the ceramic tile have higher scratch resistance.

[0057] Combining the performance test data of the tiles of Example 1 and Comparative Examples 1-6, it was found that adding corundum powder, silicon carbide whiskers, sodium lignin sulfonate and water glass to the raw materials of the tile body and adding nanodiamonds and zinc oxide to the glaze can improve the hardness of the tiles to varying degrees.

[0058] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-hardness scratch-resistant tile, characterized in that: The invention comprises a blank and a glaze; the blank comprises the following raw materials in parts by weight: 30-50 parts of kaolin, 20-40 parts of quartz sand, 10-30 parts of potassium feldspar, 1-3 parts of corundum powder, 10-20 parts of silicon carbide whiskers, 0.5-1 parts of sodium lignin sulfonate, and 3-6 parts of water glass; Based on the weight of the glaze, the glaze includes the following raw materials in parts by weight: 15-45 parts of spodumene, 5-15 parts of quartz sand, 5-10 parts of potassium feldspar, 1-3 parts of nano-diamond, and 1-3 parts of zinc oxide.

2. The high-hardness scratch-resistant ceramic tile according to claim 1, characterized in that: The green body comprises the following raw materials in parts by weight: 35-45 parts of kaolin, 25-35 parts of quartz sand, 15-25 parts of potassium feldspar, 1.5-2.5 parts of corundum powder, 13-17 parts of silicon carbide whiskers, 0.7-0.9 parts of sodium lignin sulfonate, and 4-5 parts of water glass; Based on the weight of the glaze, the glaze includes the following raw materials in parts by weight: 20-30 parts of spodumene, 7-12 parts of quartz sand, 7-9 parts of potassium feldspar, 1.5-2.5 parts of nanodiamond, 5-7 parts of zirconium silicate, and 1.5-2.5 parts of zinc oxide.

3. The high-hardness scratch-resistant ceramic tile according to claim 1, characterized in that: The weight ratio of the corundum micropowder to the silicon carbide whisker is 1:(5-15).

4. The high-hardness scratch-resistant ceramic tile according to claim 1, characterized in that: The corundum micropowder is prepared by modification, specifically: S1. Add the corundum powder to a nitric acid solution with a mass concentration of 15%, react at 65-75°C for 140-160 minutes, filter, wash until neutral, and dry to obtain pretreated corundum powder; S2. dissolving zirconium oxychloride in deionized water, adjusting the pH to 1-2, and adding polyvinyl alcohol to obtain a zirconium oxychloride sol with a concentration of 0.2-0.8 mol / L; S3. Immerse the pretreated corundum micropowder in zirconium oxychloride sol, disperse it by ultrasonication, dry it, and calcine it at 500-600° C. for 1-3 hours to obtain modified corundum micropowder.

5. The high-hardness scratch-resistant ceramic tile according to claim 4, characterized in that: After the drying, the product is aged at a temperature of 25-30° C. for 8-14 hours.

6. The high-hardness scratch-resistant ceramic tile according to claim 4, characterized in that: The mass ratio of the zirconium oxychloride sol to the pretreated corundum powder is 1:(1-3).

7. The high-hardness scratch-resistant ceramic tile according to claim 1, characterized in that: The glaze also includes 0.5-1 parts by weight of yttrium oxide.

8. The high-hardness scratch-resistant ceramic tile according to claim 7, characterized in that: The weight ratio of yttrium oxide to zinc oxide is 1:(2-4).

9. A production process for the high-hardness scratch-resistant ceramic tile according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: grinding the raw materials of the green body, passing through a 100-300 mesh sieve, pressing into shape, maintaining the temperature at 600°C for 10 hours, heating to 1000°C for 1 hour, further heating to 1400°C for firing for 3 hours, cooling, edge grinding, and polishing to obtain the green body; Mix the raw materials of the glaze, add water and ball grind to 325 mesh, sieve, control the glaze slurry density at 1.4-1.6g / cm³, apply glaze on the surface of the blank in a rotary manner with a thickness of 0.1-0.3mm, dry at 80-120℃ for 10-20min, fire at 1050-1100℃ for 1-1.5h, cool and polish to obtain high-hardness scratch-resistant tiles.

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