High-strength ceramic green body as well as preparation method and application thereof

Abstract

The invention relates to the technical field of ceramics, in particular to a high-strength ceramic green body as well as a preparation method and application thereof, the ceramic green body comprises the following raw materials in parts by weight: 50-70 parts of kaolin, 15-20 parts of potassium feldspar, 16-20 parts of quartz powder, 3-5 parts of alpha-aluminum oxide, 0.5-1.5 parts of bentonite, 0.6-1.0 part of talc, 0.05-0.15 part of sodium humate, 0.2-0.4 part of water glass and 0.5-1.5 parts of a reinforcing material; the reinforcing material reacts in the presence of nitrogen to generate the A < l > ON layer and the S ON layer, and the A < l > ON layer can block pores in the surface of the refractory material and prevent the interior of the refractory material from being eroded; the S ON layer has good chemical stability and oxidation resistance, can be used as a protective layer of a high-dielectric-constant dielectric material, and is beneficial to prolonging the service life of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramics, and particularly relates to a high-strength ceramic green body, a preparation method thereof and an application thereof. Background Art

[0002] Ceramics, that is, the general term for pottery and porcelain. Any object made from these two different types of clay, namely kaolin and porcelain clay, through processes such as batching, shaping, drying, and roasting can be called ceramics.

[0003] For existing ceramic green bodies, materials such as aluminum silicate fibers are added to improve the strength of the ceramic green body. However, the addition of aluminum silicate fibers; in an acidic or alkaline environment, aluminum silicate fibers may be corroded, especially under the combined action of high temperature and corrosive gases, which will limit its application in certain industrial environments. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength ceramic green body, a preparation method thereof and an application thereof. The technical problem solved by the present invention is that materials such as aluminum silicate fibers are added to improve the strength of the ceramic green body. However, the addition of aluminum silicate fibers; in an acidic or alkaline environment, aluminum silicate fibers may be corroded, especially under the combined action of high temperature and corrosive gases, which will limit its application in certain industrial environments.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A high-strength ceramic green body, comprising the following raw materials in parts by weight:

[0007] The ceramic green body comprises the following raw materials in parts by weight: 50 - 70 parts of kaolin, 15 - 20 parts of potassium feldspar, 16 - 20 parts of quartz powder, 3 - 5 parts of α-aluminum oxide, 0.5 - 1.5 parts of bentonite, 0.6 - 1.0 parts of talc, 0.05 - 0.15 parts of sodium humate, 0.2 - 0.4 parts of water glass, 0.5 - 1.5 parts of reinforcing material;

[0008] Among them, the preparation process of the reinforcing material includes the following steps:

[0009] Aluminum silicate fibers are modified by a titanate coupling agent in deionized water at 90 - 120 °C for 6 h to obtain modified aluminum silicate fibers.

[0010] As a further scheme of the present invention: the mass ratio of aluminum silicate fibers, titanate coupling agent and deionized water is 100:1 - 3:10 - 60.

[0011] As a further scheme of the present invention: the aluminum silicate fibers are composed of long aluminum silicate fibers and short aluminum silicate fibers in a mass ratio of 2:1.

[0012] As a further solution of the present invention: the single filament diameter of the long aluminosilicate fiber is 100 - 120 μm, and the aspect ratio is 40 - 45:1.

[0013] As a further solution of the present invention: the single filament diameter of the short aluminosilicate fiber is 50 - 60 μm, and the aspect ratio is 40 - 45:1.

[0014] A method for preparing a high-strength ceramic green body, comprising the following steps:

[0015] After the powder material is pressed into shape, it is heat-insulated for 30 - 90 min in a nitrogen atmosphere at 1200 - 1400 °C, and after the heat insulation is completed, it is naturally cooled to room temperature in the furnace, thus obtaining a high-strength ceramic green body.

[0016] As a further solution of the present invention: the preparation process of the powder material, comprising the following steps:

[0017] After weighing the raw material components according to the ratio, wet ball milling and mixing are carried out to obtain a slurry, and after drying, grinding, and sieving, the powder material is obtained.

[0018] As a further solution of the present invention: the temperature is raised from room temperature to 1200 - 1400 °C at a heating rate of 10 - 20 °C / min.

[0019] As a further solution of the present invention: the titanate coupling agent generates highly active residual carbon during the heating process, and the highly active residual carbon and active oxygen-containing silicon-aluminum are tightly adhered to the surface and surface pores of the green body, and react in the presence of nitrogen to generate an AlON layer and a SiON layer.

[0020] An application of a high-strength ceramic green body, and this ceramic green body is applied to the fields of building tiles and ceramic bearings.

[0021] The beneficial effects of the present invention:

[0022] The functions of kaolin in ceramics mainly include the following aspects:

[0023] Improving chemical stability and sintering strength: Kaolin introduces Al2O3 into ceramics, which is beneficial to the formation of mullite. Mullite has high chemical stability and heat resistance, and can significantly improve the sintering strength of ceramics.

[0024] Forming the main framework of the green body strength: During the firing process, kaolin decomposes to generate mullite, and these mullite crystals form the main framework of the green body strength, which can effectively prevent the deformation of the product during the firing process.

[0025] Broadening the firing temperature range: The use of kaolin can widen the firing temperature range, which means greater flexibility in temperature control during the production process, and helps to improve the quality and consistency of products.

[0026] Increasing whiteness: Kaolin can endow the green body with a certain degree of whiteness, which is particularly important for the production of white or light-colored porcelain. High-purity kaolin is white, contributing to improving the overall appearance quality of ceramic products.

[0027] As a binder: Kaolin can also act as a binder to bond other mineral ingredients (such as feldspar, quartz, etc.) together to form a porcelain body, helping to make the ceramic structure denser and increasing ductility and toughness.

[0028] Improving processing performance: Kaolin can increase the hardness and toughness of ceramics, making the products easier to process and less prone to breakage, thus improving production efficiency and product quality.

[0029] Application in glazes: The sintering effect of kaolin in ceramic glazes is also very important. It can affect the fluidity, transparency and gloss of glazes, thereby influencing the appearance and quality of the finished products.

[0030] Potassium feldspar plays an important role in the ceramic industry, mainly reflected in the following aspects:

[0031] Lowering the melting point: The addition of potassium feldspar can significantly reduce the melting point of ceramics, making it easier for ceramics to melt during firing, thus reducing the firing temperature and energy consumption.

[0032] Improving strength and gloss: The addition of potassium feldspar can increase the strength and gloss of ceramic finished products. Potassium element has a fluxing property, which can improve the fluidity of the glaze, thereby enhancing the gloss and aesthetics of ceramics.

[0033] Improving product performance: The application of potassium feldspar can improve the quality and performance of ceramic products. For example, in the production of high-end glass, potassium feldspar is gradually becoming an important alternative to traditional materials, significantly improving the product quality.

[0034] The role of quartz powder in ceramics is mainly reflected in two aspects: the green body and the glaze.

[0035] Role in the ceramic green body

[0036] Adjusting the plasticity of the clay and reducing shrinkage: During the heating process at room temperature, quartz powder can adjust the plasticity of the clay, reduce shrinkage, shorten the drying time, and prevent the green body from deforming.

[0037] Preventing the green body from deforming: During firing, the volume expansion of quartz can offset the shrinkage of the green body, preventing defects such as bending and deformation of the green body during firing.

[0038] Increasing mechanical strength and light transmittance: Quartz powder can increase the mechanical strength and light transmittance of the green body, improving the quality and appearance of porcelain.

[0039] The role of α-alumina in ceramics is mainly reflected in enhancing the physical and chemical properties of ceramics.

[0040] α-alumina (α-Al2O3) is a ceramic material with high melting point and high hardness, and has excellent properties such as high temperature resistance, wear resistance, and corrosion resistance. These properties make α-alumina play an important role in ceramics.

[0041] Enhancing the physical properties of ceramics

[0042] Hardness: α-alumina has extremely high hardness, which makes ceramic products containing α-alumina have higher wear resistance and scratch resistance.

[0043] High temperature resistance: α-alumina has a melting point as high as 2050 °C, enabling it to remain stable in high-temperature environments and being suitable for ceramic products that require high temperature resistance.

[0044] Strength: α-alumina ceramics have relatively high flexural strength and fracture toughness, which can significantly improve the mechanical strength and toughness of ceramics.

[0045] The specific role of bentonite in the ceramic industry

[0046] Enhancing the quality and performance of ceramics: Bentonite acts as a binder and thickener in the ceramic manufacturing process, significantly enhancing the strength and stability of the ceramic body, ensuring that the product is not easily deformed during the firing process, and thus increasing the finished product rate.

[0047] Enhancing the strength and stability of ceramics: Bentonite can enhance the hardness and wear resistance of ceramics. Especially in building sanitary ceramics, calcium-containing bentonite significantly improves the gloss of ceramic products by adjusting the melting properties and surface flatness of the glaze.

[0048] Improving the uniformity and gloss of the glaze: The suspension and thixotropy of bentonite make the ceramic glaze more uniform and delicate, and the surface of the fired ceramic product is smoother and more delicate, with a better touch. Especially in daily-use ceramics, calcium-free bentonite can avoid the deposition of calcium in the glaze, maintain the purity and transparency of the glaze surface, and further improve the uniformity and gloss of the glaze surface.

[0049] The role of talc in ceramics is mainly reflected in two aspects: promoting low-temperature fast firing and improving mechanical strength. Talc is a hydrous magnesium silicate mineral, which can be made into talc powder through mechanical processing and is widely used in the ceramic industry.

[0050] Promoting low-temperature fast firing

[0051] Talc is an ideal raw material for low-temperature fast firing, which can significantly reduce the sintering and vitrification temperatures of the ceramic body, thereby shortening the firing cycle. The specific mechanisms include:

[0052] Solid-phase reaction: At relatively low temperatures, talc undergoes a solid-phase reaction to form enstatite, while at relatively high temperatures, talc reacts with clay minerals to form cordierite. These reactions promote mass transfer and diffusion, facilitating sintering.

[0053] Fluxing effect: Magnesium oxide in talc has a strong fluxing effect, significantly reducing the vitrification temperature.

[0054] Formation of glass phase: The glass phase containing magnesium oxide formed at high temperatures has a large surface tension and low viscosity, facilitating the sintering reaction via the viscous flow mechanism.

[0055] Improving mechanical strength

[0056] Talc significantly improves the mechanical strength of the ceramic body through the glass phase generated by the fluxing effect of magnesium oxide in its composition. The specific mechanisms include:

[0057] Effect of glass phase: Magnesium oxide has a positive impact on compressive strength and hardness in the glass composition. Since the Mg2+ ion has a small radius, high charge, and strong polarization ability, it enhances the elasticity of the glass.

[0058] Solid-phase reaction: The enstatite and cordierite formed by the reaction of talc with clay minerals have high hardness, contributing to the improvement of the mechanical strength of the ceramic body.

[0059] Coefficient of thermal expansion: The enstatite and cordierite formed from talc have a small coefficient of thermal expansion, helping to prevent glaze cracks and late-stage crazing of the product glaze surface.

[0060] The functions of sodium humate (sodium humate) in ceramics mainly include dilution, strengthening, adsorption, bonding, and plasticization. Specifically:

[0061] Dilution effect: After adding sodium humate to the clay-water system, the anions of sodium humate are adsorbed on the surface of clay particles, causing the particles to disperse, increasing the double-layer potential, and releasing the water in the clay structure, thus playing a dilution role. This can increase the fluidity of the mud and glaze, and improve the fluidity of the mud.

[0062] Strengthening effect: Sodium humate can change the properties of the clay-water system, reduce the water content of the green body, reduce the shrinkage rate during the drying process, make the dry green body more dense, and improve its strength. Experiments show that adding sodium humate can increase the strength of the ceramic mud body by about 80%, reduce the breakage of semi-finished products, and facilitate fine processing.

[0063] Adsorption and bonding effects: Sodium humate has high-molecular active functional groups and strong adhesiveness. Its molecular structure is similar to a sponge, with a large specific surface area, capable of adsorbing the glaze and reducing defects such as glaze peeling, pinholes, and wire breaks.

[0064] Plasticizing effect: Sodium humate contains hydrophilic polar groups, which can form a hydration film in aqueous solution, enhance the plasticity index of the mud, make the green body mud easy to form, reduce the cracking of semi-finished products, and facilitate mechanized production.

[0065] Dosage: In ceramic production, the addition amount of sodium humate is generally 0.125% to 0.3%. The specific dosage needs to be adjusted according to the characteristics of ceramic raw materials and production processes.

[0066] Sodium silicate has various functions in ceramic production, mainly including enhancing adhesion, reducing cracks, improving hardness and toughness, enhancing fire resistance and acid and alkali resistance, etc. Specifically:

[0067] Enhancing adhesion: The main component of sodium silicate is sodium silicate, which has a colloidal viscous property. It can chemically react with cement admixtures such as fly ash to form a silicate gel, thereby increasing the adhesion of ceramic raw materials. This helps to make the product more compact and effectively prevent the raw material from pulverizing during the kneading process 1.

[0068] Reducing cracks: During the high-temperature sintering process, the addition of sodium silicate can reduce the shrinkage rate during ceramic sintering, thereby reducing the possibility of ceramic cracking and improving the quality and uniformity of ceramic products 1.

[0069] Improving hardness and toughness: Sodium silicate contains a large amount of Si2, which helps to increase the hardness of ceramic products, thereby improving the hardness and toughness of ceramic products 1.

[0070] Enhancing fire resistance and acid and alkali resistance: Sodium silicate can react with other additives to form a dense protective film, effectively increasing the fire resistance and acid and alkali resistance of ceramic products and making them more durable 1.

[0071] As a water reducing agent: In ceramic water reducing agents, sodium silicate can reduce the water consumption during the ball milling of ceramic billet glaze, increase the fluidity of the slurry, and reduce the slurry viscosity, thereby improving the production efficiency of ceramics.

[0072] In the present invention, by adding modified aluminum silicate fiber, the aluminum silicate fiber has a small thermal expansion coefficient and high strength, and mullite and cristobalite are precipitated during the high-temperature sintering process. Its addition inhibits the sintering process of ceramic tiles to a certain extent, reduces the shrinkage of ceramic tiles, and improves the strength of ceramic tiles;

[0073] And aluminum silicate fiber is a high-performance refractory fiber material mainly composed of alumina and silica, which is widely used in the field of high-temperature heat insulation. Although it has the advantages of light weight, low thermal conductivity and high temperature resistance; sintered in a nitrogen atmosphere;

[0074] During the heating process, the titanate coupling agent generates highly active residual carbon. The highly active residual carbon and activated alumina adhere tightly to the surface and surface pores of the green body. Under the participation of nitrogen, an AlON layer is formed through reaction, which binds tightly to the surface of the refractory material, enhancing the strength and corrosion resistance of the refractory material. Moreover, the AlON layer can block the pores on the surface of the refractory material, preventing the erosion of the interior of the refractory material and further improving the corrosion resistance;

[0075] Meanwhile, during the heating process, the titanate coupling agent generates highly active residual carbon. The highly active residual carbon and activated oxygen-containing silicon-aluminum adhere tightly to the surface and surface pores of the green body. Under the participation of nitrogen, a SiON layer is formed through reaction, which binds tightly to the surface of the refractory material, enhancing the strength and corrosion resistance of the refractory material. And the SiON layer has good chemical stability and oxidation resistance, and can be used as a protective layer for high dielectric constant dielectric materials, helping to extend the service life of the equipment;

[0076] In addition, the effect of the titanate coupling agent during the high-temperature sintering process is significantly different from its action mechanism at room temperature. It can reduce the sintering temperature of ceramic powders and promote grain boundary diffusion and densification (especially in ceramic systems such as alumina and zirconia). Specific Embodiments

[0077] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0078] Embodiment 1

[0079] An enhancing material for high-strength ceramic green bodies provided in Embodiment 1 of the present invention;

[0080] Among them, the preparation process of the enhancing material includes the following steps:

[0081] The aluminum silicate fiber is modified by a titanate coupling agent in deionized water at 90 °C for 6 h to obtain modified aluminum silicate fiber;

[0082] Among them, the mass ratio of aluminum silicate fiber, titanate coupling agent and deionized water is 100:1:10;

[0083] Among them, the aluminum silicate fiber is composed of long aluminum silicate fiber and short aluminum silicate fiber in a mass ratio of 2:1. Among them, the single filament diameter of the long aluminum silicate fiber is 100 μm, and the aspect ratio is 40:1. The single filament diameter of the short aluminum silicate fiber is 50 μm, and the aspect ratio is 40:1.

[0084] Example Two

[0085] An reinforcing material for high-strength ceramic green bodies provided in Example One of the present invention;

[0086] Among them, the preparation process of the reinforcing material includes the following steps:

[0087] The aluminosilicate fiber is modified by a titanate coupling agent in deionized water at 100 °C for 6 h to obtain a modified aluminosilicate fiber;

[0088] Among them, the mass ratio of aluminosilicate fiber, titanate coupling agent and deionized water is 100:2:30;

[0089] Among them, the aluminosilicate fiber is composed of long aluminosilicate fiber and short aluminosilicate fiber according to a mass ratio of 2:1. Among them, the single filament diameter of the long aluminosilicate fiber is 110 μm, and the aspect ratio is 42:1. The single filament diameter of the short aluminosilicate fiber is 55 μm, and the aspect ratio is 42:1.

[0090] Example Three

[0091] An reinforcing material for high-strength ceramic green bodies provided in Example One of the present invention;

[0092] Among them, the preparation process of the reinforcing material includes the following steps:

[0093] The aluminosilicate fiber is modified by a titanate coupling agent in deionized water at 120 °C for 6 h to obtain a modified aluminosilicate fiber;

[0094] Among them, the mass ratio of aluminosilicate fiber, titanate coupling agent and deionized water is 100:3:60;

[0095] Among them, the aluminosilicate fiber is composed of long aluminosilicate fiber and short aluminosilicate fiber according to a mass ratio of 2:1. Among them, the single filament diameter of the long aluminosilicate fiber is 120 μm, and the aspect ratio is 45:1. The single filament diameter of the short aluminosilicate fiber is 60 μm, and the aspect ratio is 45:1.

[0096] Example Four

[0097] A high-strength ceramic green body provided in Example One of the present invention, its preparation method and application, including the following raw materials in parts by weight:

[0098] The ceramic green body includes the following raw materials in parts by weight: 50 parts of kaolin, 15 parts of potassium feldspar, 16 parts of quartz powder, 3 parts of α-aluminum oxide, 0.5 part of bentonite, 0.6 part of talc, 0.05 part of sodium humate, 0.2 - 0.4 part of water glass, 0.5 part of reinforcing material;

[0099] Among them, a preparation method of a high-strength ceramic green body includes the following steps:

[0100] Step 1: Weigh the raw material components according to the ratio, then carry out wet ball milling and mixing to obtain a slurry. After drying, grinding, and sieving, a powder is obtained.

[0101] Step 2: After the powder is pressed into shape, it is heated from room temperature to 1300 °C at a heating rate of 15 °C / min, kept warm for 50 min in a nitrogen atmosphere, and then naturally cooled to room temperature in the furnace, thus obtaining a high-strength ceramic blank.

[0102] Example Five

[0103] A high-strength ceramic blank provided by the second embodiment of the present invention, its preparation method and application, include the following raw materials in parts by weight:

[0104] The ceramic blank includes the following raw materials in parts by weight: 60 parts of kaolin, 18 parts of potassium feldspar, 18 parts of quartz powder, 4 parts of α-aluminum oxide, 1.0 part of bentonite, 0.8 part of talc, 0.10 part of sodium humate, 0.3 part of water glass, 1.0 part of reinforcing material;

[0105] Among them, a preparation method of a high-strength ceramic blank includes the following steps:

[0106] Step 1: Weigh the raw material components according to the ratio, then carry out wet ball milling and mixing to obtain a slurry. After drying, grinding, and sieving, a powder is obtained.

[0107] Step 2: After the powder is pressed into shape, it is heated from room temperature to 1300 °C at a heating rate of 15 °C / min, kept warm for 60 min in a nitrogen atmosphere, and then naturally cooled to room temperature in the furnace, thus obtaining a high-strength ceramic blank.

[0108] Example Six

[0109] A high-strength ceramic blank provided by the third embodiment of the present invention, includes the following raw materials in parts by weight:

[0110] The ceramic blank includes the following raw materials in parts by weight: 70 parts of kaolin, 20 parts of potassium feldspar, 20 parts of quartz powder, 5 parts of α-aluminum oxide, 1.5 part of bentonite, 1.0 part of talc, 0.15 part of sodium humate, 0.2 - 0.4 part of water glass, 1.5 parts of reinforcing material;

[0111] Among them, a preparation method of a high-strength ceramic blank includes the following steps:

[0112] Step 1: Weigh the raw material components according to the ratio, then carry out wet ball milling and mixing to obtain a slurry. After drying, grinding, and sieving, a powder is obtained.

[0113] Step 2: After the powder material is pressed into shape, it is heated from room temperature to 1400 °C at a heating rate of 20 °C / min, kept warm for 90 min in a nitrogen atmosphere, and then naturally cooled to room temperature in the furnace, thus obtaining a high-strength ceramic green body.

[0114] Example Seven

[0115] A high-strength ceramic green body provided in Embodiments Four to Six of the present invention is applied to building tiles, ceramic bearings, etc.

[0116] Comparative Example One

[0117] Different from Example Six, no reinforcing material is added to the glaze;

[0118] The compressive strength and corrosion resistance of Examples Four, Five, and Six and Comparative Example One were tested. Among them, the test results of the corrosion resistance are as follows: The acid resistance of the glazed tile was tested in a 20% sulfuric acid solution with reference to the test method of JC / T258-1993, and the density of the sulfuric acid solution was 1.14 g / cm 3 ; and the alkali resistance of the glazed tile was tested in a 20% sodium hydroxide solution, and the loss rate of the specimen was calculated after the specimen was treated with a 20% sulfuric acid solution with a density of 1.84 g / cm 3 for 96 hours. Among them: Specimen loss rate = (Original mass of the specimen - Mass of the specimen after weathering treatment) / Original mass of the specimen; The test results are shown as follows:

[0119]

[0120]

[0121] It can be seen from the above table that the ceramic green body prepared by the present invention by adding a reinforcing material not only has good high compressive strength performance but also has good corrosion resistance.

[0122] The above has described a detailed description of an embodiment of the present invention, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. A high-strength ceramic body, characterized in that: It includes the following raw materials in parts by weight: The ceramic body comprises the following raw materials in parts by weight: 50-70 parts of kaolin, 15-20 parts of potassium feldspar, 16-20 parts of quartz powder, 3-5 parts of α-alumina, 0.5-1.5 parts of bentonite, 0.6-1.0 parts of talc, 0.05-0.15 parts of sodium humate, 0.2-0.4 parts of water glass, and 0.5-1.5 parts of reinforcing material; The preparation process of the reinforcing material comprises the following steps: The aluminum silicate fiber is modified by a titanate coupling agent in deionized water at 90-120° C. for 6 hours to obtain modified aluminum silicate fiber.

2. A high-strength ceramic body according to claim 1, characterized in that: The mass ratio of aluminum silicate fiber, titanate coupling agent and deionized water is 100:1-3:10-60.

3. The anti-fouling ceramic glaze according to claim 2, characterized in that: The aluminum silicate fiber is composed of long aluminum silicate fiber and short aluminum silicate fiber in a mass ratio of 2:

1.

4. A high-strength ceramic body according to claim 3, characterized in that: The monofilament diameter of the long aluminum silicate fiber is 100-120 μm, and the aspect ratio is 40-45:

1.

5. A high-strength ceramic body according to claim 4, characterized in that: The monofilament diameter of the short aluminum silicate fiber is 50-60 μm, and the aspect ratio is 40-45:

1.

6. A method for preparing a high-strength ceramic body, characterized in that: The following steps are involved: After the powder is pressed into shape, it is kept warm at 1200-1400°C in a nitrogen atmosphere for 30-90 minutes. After the heat preservation is completed, it is naturally cooled to room temperature in the furnace to obtain a high-strength ceramic body.

7. The method for preparing a high-strength ceramic body according to claim 4, characterized in that: The preparation process of the powder comprises the following steps: The raw materials are weighed according to the proportions, and then wet ball milled to obtain slurry, which is then dried, ground and sieved to obtain powder.

8. The method for preparing a high-strength ceramic body according to claim 4, characterized in that: The temperature was raised from room temperature to 1200-1400°C at a heating rate of 10-20°C / min.

9. The method for preparing a high-strength ceramic body according to claim 4, characterized in that: The titanate coupling agent generates highly active carbon residue during the heating process. The highly active carbon residue and active oxygen silicon aluminum are tightly adhered to the surface and surface pores of the blank, and react with the participation of nitrogen to form Al ON layer and Si ON layer.

10. Application of a high-strength ceramic body, characterized in that: The ceramic body is used in the fields of building tiles and ceramic bearings.

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