A preparation process of wear-resistant quartz sand ceramic material

Abstract

The present invention provides a preparation process of wear-resistant quartz sand ceramic material, relating to the technical field of ceramic materials. The preparation process comprises: pre-treating quartz sand and uniformly mixing it with iron oxide-modified kaolin, barium carbonate, titanium diboride, aluminum nitride, aluminum oxide and titanium dioxide to obtain a base material, adding 3-7% of an additive relative to the weight of the base material and stirring and dispersing it to obtain a mixed powder, placing the mixed powder into a mold and pressing it to obtain a ceramic body, which is naturally cooled to room temperature after sintering. The present invention optimizes the raw material ratio, improves the preparation process and adds specific additives. The quartz sand ceramic material prepared has excellent mechanical properties, wear resistance and high-temperature cycle stability, providing strong technical support for the development of related fields.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant materials, and in particular to a preparation process of a wear-resistant quartz sand ceramic material. Background Art

[0002] Quartz sand, a silicate raw material, is widely used in ceramics, glass, casting, construction, chemicals, and abrasives due to its high hardness, wear resistance, and chemical stability. However, natural quartz sand often contains various impurities, requiring specialized purification processes to meet the demands of high-quality products. In the preparation of ceramic materials, the purity and particle size of quartz sand have a crucial impact on the performance of the final product.

[0003] When preparing wear-resistant quartz sand ceramic materials, in addition to requiring high-purity raw materials, attention must also be paid to their wear resistance, stability at different temperatures, and weather resistance. Traditional quartz ceramic materials have deficiencies in wear resistance, high-temperature stability, and weather resistance, making them difficult to meet the high demands of certain specific applications. Based on this, the present invention provides a process for preparing wear-resistant quartz sand ceramic materials. Summary of the Invention

[0004] The object of the present invention is to provide a preparation process of a wear-resistant quartz sand ceramic material, wherein the prepared quartz sand ceramic material has excellent mechanical properties, wear resistance and high-temperature cycle stability.

[0005] On the one hand, the present invention provides a preparation process for wear-resistant quartz sand ceramic material, comprising the following steps: pre-treating quartz sand and uniformly mixing it with iron oxide-modified kaolin, barium carbonate, titanium diboride, aluminum nitride, aluminum oxide and titanium dioxide to obtain a base material; adding 3-7% of an additive by weight relative to the base material, stirring and dispersing the mixture to obtain a mixed powder; placing the mixed powder into a mold and pressing the mold to obtain a ceramic green body; and sintering and then naturally cooling the green body to room temperature.

[0006] Furthermore, the quartz sand pretreatment step includes: soaking the quartz sand in a 20-30% HCl aqueous solution for 24-26 hours, rinsing with deionized water until neutral, drying and grinding at 60-80° C., and finally passing through a 100-200 mesh sieve.

[0007] Furthermore, the preparation method of the iron oxide-modified kaolin includes: calcining kaolin with a particle size of 70-80 μm at 800-840° C. for 2-3 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at a temperature of 60-80° C. and a stirring speed of 140-160 rpm, continuing to stir for 120-140 minutes, drying at 100-110° C. to constant weight, and grinding to obtain the product.

[0008] Furthermore, the weight ratio of the kaolin, cocamidopropyl betaine, ethanol and iron oxide is (1-2): (0.2-0.3): (2-3): (0.5-1).

[0009] Furthermore, the base material includes the following materials in parts by weight: 8-12 parts of pretreated quartz sand, 10-12 parts of iron oxide modified kaolin, 4-6 parts of barium carbonate, 2-4 parts of titanium diboride, 3-5 parts of aluminum nitride, 4-6 parts of aluminum oxide, and 6-10 parts of titanium dioxide.

[0010] Furthermore, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of (20-50): (5-10): (1-5): (6-30).

[0011] Furthermore, the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid.

[0012] Furthermore, the dispersant includes sodium dodecylbenzenesulfonate and polyacrylate in a weight ratio of 1:5.

[0013] Furthermore, the pressure during pressing is 60-80 MPa.

[0014] Furthermore, the sintering step includes: firing at 200-300°C for 4-6 hours, heating to 700-800°C at a heating rate of 3-5°C / min, keeping warm and firing for 2-4 hours, then heating to 1100-1200°C at a heating rate of 3-5°C / min, and keeping warm and firing for 2-4 hours.

[0015] The beneficial effects of the present invention are:

[0016] The present invention pre-treats the quartz sand by immersing it in an aqueous HCl solution, effectively removing impurities and attachments from the sand's surface while also slightly etching the surface to increase its binding strength with other components. The dried and ground quartz sand particles are evenly distributed, helping to improve the overall density and strength of the ceramic material.

[0017] The addition of hard phase components such as titanium diboride and aluminum nitride significantly improves the hardness and wear resistance of the ceramic material. These hard phases act as a "skeleton" within the ceramic material, resisting external wear and scratches. The addition of components such as aluminum oxide and titanium dioxide enhances the ceramic material's stability at high temperatures. These components have high melting points and good thermal stability, enabling them to maintain stable performance in high-temperature environments.

[0018] The present invention uses iron oxide-modified kaolin as the main raw material. After high-temperature calcination, the crystal water in the kaolin is removed, and the crystal structure is changed, thereby becoming more stable. The calcination process also changes the surface properties of the kaolin, making it easier to combine with iron oxide; the calcined kaolin is mixed with cocamidopropyl betaine and ethanol to form a high-quality dispersion system. The addition of iron oxide not only improves the performance of kaolin, but also enhances the hardness and wear resistance of the ceramic material; cocamidopropyl betaine, as a surfactant, promotes the uniform mixing of the components, further improving the overall performance of the ceramic material.

[0019] Iron oxide inherently possesses excellent wear resistance, and its introduction significantly enhances the wear resistance of quartz sand ceramic materials. The uniform distribution of iron oxide-modified kaolin in the ceramic material helps reduce wear points and extend the material's service life. Furthermore, iron oxide and kaolin form a chemical bond, creating a stable chemical bond. This bond further enhances the structural stability of kaolin, making it less susceptible to decomposition or phase transitions at high temperatures. The distribution of iron oxide particles on the surface or between layers of kaolin creates a thermal barrier, slowing the transfer of heat into the kaolin. This helps reduce the thermal stress of kaolin at high temperatures, thereby minimizing the possibility of structural damage.

[0020] The additives used in the present invention include a binder, a plasticizer, a lubricant and a dispersant. The binder polyvinyl alcohol can enhance the cohesion of the ceramic material and make it stronger; the plasticizer emulsified paraffin can improve the plasticity of the ceramic material and make it easier to shape; the lubricant oleic acid can reduce the friction resistance of the ceramic material during the pressing process and improve the pressing efficiency; and the dispersants such as sodium dodecylbenzene sulfonate and polyacrylate can ensure that the various raw materials are evenly dispersed during the mixing process to avoid the occurrence of agglomeration.

[0021] In the present invention, sodium dodecylbenzene sulfonate and polyvinyl ester are composited as dispersants, wherein sodium dodecylbenzene sulfonate can be adsorbed on the quartz sand particle surface in the preparation process of quartz sand ceramic material, forms a wetting film, and this layer of film can stop the reunion between the particles, makes the quartz sand particles uniformly dispersed in water, thereby improves the uniformity and the compactness of the material. And the molecular structure of sodium dodecylbenzene sulfonate enables it to form chemical bonding or physical adsorption with the inorganic components in the ceramic material, and this combination can strengthen the interfacial bonding force between the quartz sand particles and the ceramic matrix, thereby improves the mechanical property of the material. And the adding of polyvinyl ester can increase the toughness of the material, enables it to absorb and disperse energy better when being subjected to external force, thereby reduces the wear and tear of the material surface and peels off, improves wear resistance. On this basis, the composite of sodium dodecylbenzene sulfonate and polyvinyl ester can produce synergistic effect, brings into play advantage separately, complements each other, and this composite dispersant can more effectively reduce the agglomeration phenomenon between the quartz sand particles, improves the uniformity and the compactness of the material. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] It should be noted that the model of the polyvinyl alcohol in the present invention is PVA-1788, the model of the emulsified paraffin is E-200, and the model of the polyvinyl ester is EEA A713.

[0024] Example 1

[0025] This embodiment provides a preparation process of a wear-resistant quartz sand ceramic material, the steps comprising:

[0026] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0027] The preparation method of iron oxide-modified kaolin includes: calcining kaolin with a particle size of 75 μm at 820° C. for 2.5 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 70° C. and stirring at 150 rpm, continuing stirring for 130 minutes, drying at 105° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the kaolin, cocamidopropyl betaine, ethanol, and iron oxide is 0.5:0.25:2.5:0.7;

[0028] Preparation of wear-resistant quartz sand ceramic material: According to weight parts, 10 parts of pretreated quartz sand, 11 parts of iron oxide modified kaolin, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly to obtain a base material, and 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder. The mixed powder is loaded into a mold and pressed under a pressure of 70 MPa to obtain a ceramic body, which is fired at 250°C for 5 hours, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3 hours, and then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3 hours. After sintering, it is naturally cooled to room temperature.

[0029] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0030] Example 2

[0031] This embodiment provides a preparation process of a wear-resistant quartz sand ceramic material, the steps comprising:

[0032] The quartz sand pretreatment steps include: immersing the quartz sand in a 20% HCl aqueous solution for 26 hours, rinsing with deionized water until neutral, drying and grinding at 80° C., and finally passing through a 100-mesh sieve;

[0033] The preparation method of iron oxide-modified kaolin includes: calcining kaolin with a particle size of 70 μm at 820° C. for 2 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 80° C. and stirring at 140 rpm, continuing stirring for 140 minutes, drying at 100° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the kaolin, cocamidopropyl betaine, ethanol, and iron oxide is 1:0.2:2:0.5;

[0034] Preparation of wear-resistant quartz sand ceramic material: 9 parts of pretreated quartz sand, 10 parts of iron oxide modified kaolin, 5 parts of barium carbonate, 2 parts of titanium diboride, 3 parts of aluminum nitride, 4 parts of aluminum oxide, and 7 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, and 4% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder. The mixed powder is loaded into a mold and pressed at a pressure of 65 MPa to obtain a ceramic body, which is fired at 240°C for 4 hours, heated to 700°C at a heating rate of 5°C / min, kept warm and fired for 2 hours, and then heated to 1100°C at a heating rate of 5°C / min, kept warm and fired for 4 hours. After sintering, it is naturally cooled to room temperature.

[0035] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 30:6:3:15; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0036] Example 3

[0037] This embodiment provides a preparation process of a wear-resistant quartz sand ceramic material, the steps comprising:

[0038] The quartz sand pretreatment steps include: immersing the quartz sand in a 30% HCl aqueous solution for 24 hours, rinsing with deionized water until neutral, drying and grinding at 80° C., and finally passing through a 100-mesh sieve;

[0039] The preparation method of iron oxide-modified kaolin includes: calcining kaolin with a particle size of 80 μm at 840° C. for 2 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 70° C. and stirring at 140 rpm, continuing stirring for 140 minutes, drying at 100° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the kaolin, cocamidopropyl betaine, ethanol, and iron oxide is 2:0.3:3:0.6;

[0040] Preparation of wear-resistant quartz sand ceramic material: 11 parts of pretreated quartz sand, 10 parts of iron oxide modified kaolin, 6 parts of barium carbonate, 4 parts of titanium diboride, 3 parts of aluminum nitride, 6 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, and 6% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder. The mixed powder is loaded into a mold and pressed at a pressure of 80 MPa to obtain a ceramic body, which is fired at 300°C for 4 hours, heated to 700°C at a heating rate of 3°C / min, kept warm and fired for 2 hours, and then heated to 1200°C at a heating rate of 3°C / min, kept warm and fired for 2 hours. After sintering, it is naturally cooled to room temperature.

[0041] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 40:8:4:20; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0042] Example 4

[0043] This embodiment provides a preparation process of a wear-resistant quartz sand ceramic material, the steps comprising:

[0044] The pretreatment steps of the quartz sand include: immersing the quartz sand in a 25% HCl aqueous solution for 26 hours, rinsing with deionized water until neutral, drying and grinding at 80° C., and finally passing through a 200-mesh sieve;

[0045] The preparation method of iron oxide-modified kaolin includes: calcining kaolin with a particle size of 80 μm at 840° C. for 2 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 80° C. and stirring at 140 rpm, continuing stirring for 140 minutes, drying at 100° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the kaolin, cocamidopropyl betaine, ethanol, and iron oxide is 1.5:0.2:2:1;

[0046] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of iron oxide modified kaolin, 6 parts of barium carbonate, 4 parts of titanium diboride, 5 parts of aluminum nitride, 4 parts of aluminum oxide, and 6 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder, the mixed powder is loaded into a mold and pressed under a pressure of 80 MPa to obtain a ceramic body, fired at 300°C for 4h, heated to 700°C at a heating rate of 5°C / min, kept warm and fired for 4h, then heated to 1100°C at a heating rate of 3°C / min, kept warm and fired for 4h, and naturally cooled to room temperature after sintering.

[0047] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 25:7:4:16; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0048] Comparative Example 1

[0049] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0050] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0051] The preparation method of iron oxide modified kaolin comprises: calcining kaolin with a particle size of 75 μm at 820° C. for 2.5 hours, cooling to room temperature, mixing with a silane coupling agent KH560 and ethanol, adding iron oxide at 70° C. and a stirring speed of 150 rpm, continuing stirring for 130 minutes, drying at 1050° C. to constant weight, and grinding to obtain the product; the weight ratio of the kaolin, silane coupling agent KH560, ethanol, and iron oxide is 0.5:0.25:2.5:0.7;

[0052] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of iron oxide modified kaolin, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder, the mixed powder is loaded into a mold and pressed under a pressure of 70 MPa to obtain a ceramic body, fired at 250°C for 5h, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3h, then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3h, and naturally cooled to room temperature after sintering.

[0053] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0054] Comparative Example 2

[0055] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0056] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0057] The preparation method of iron oxide-modified bentonite includes: calcining bentonite with a particle size of 75 μm at 820° C. for 2.5 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 70° C. and stirring at 150 rpm, continuing stirring for 130 minutes, drying at 1050° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the bentonite, cocamidopropyl betaine, ethanol, and iron oxide is 0.5:0.25:2.5:0.7;

[0058] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of iron oxide modified bentonite, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder, the mixed powder is loaded into a mold and pressed under a pressure of 70 MPa to obtain a ceramic body, fired at 250°C for 5h, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3h, then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3h, and naturally cooled to room temperature after sintering.

[0059] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0060] Comparative Example 3

[0061] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0062] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0063] The preparation method of iron oxide-modified attapulgite includes: calcining attapulgite with a particle size of 75 μm at 820° C. for 2.5 hours, cooling to room temperature, mixing with cocamidopropyl betaine and ethanol, adding iron oxide at 70° C. and stirring at 150 rpm, continuing stirring for 130 minutes, drying at 1050° C. to constant weight, and grinding to obtain the obtained product; the weight ratio of the attapulgite, cocamidopropyl betaine, ethanol, and iron oxide is 0.5:0.25:2.5:0.7;

[0064] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of iron oxide modified attapulgite, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, and 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder. The mixed powder is loaded into a mold and pressed at a pressure of 70 MPa to obtain a ceramic body, which is fired at 250°C for 5 hours, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3 hours, and then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3 hours. After sintering, it is naturally cooled to room temperature.

[0065] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0066] Comparative Example 4

[0067] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0068] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0069] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of iron oxide and kaolin, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, and 5% of additives relative to the weight of the base material are added and stirred and dispersed to obtain a mixed powder. The mixed powder is loaded into a mold and pressed at a pressure of 70 MPa to obtain a ceramic body, which is fired at 250°C for 5 hours, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3 hours, and then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3 hours. After sintering, it is naturally cooled to room temperature.

[0070] Among them, the weight ratio of iron oxide and kaolin is 5:7, and the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0071] Comparative Example 5

[0072] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0073] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0074] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 11 parts of kaolin, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, 5% of an additive relative to the weight of the base material is added and stirred and dispersed to obtain a mixed powder, the mixed powder is loaded into a mold and pressed under a pressure of 70 MPa to obtain a ceramic body, fired at 250°C for 5h, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3h, then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3h, and naturally cooled to room temperature after sintering.

[0075] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0076] Comparative Example 6

[0077] This comparative example provides a preparation process for a wear-resistant quartz sand ceramic material, comprising the following steps:

[0078] The quartz sand pretreatment steps include: immersing the quartz sand in a 25% HCl aqueous solution for 25 hours, rinsing with deionized water until neutral, drying and grinding at 70° C., and finally passing through a 150-mesh sieve;

[0079] Preparation of wear-resistant quartz sand ceramic material: 10 parts of pretreated quartz sand, 5 parts of barium carbonate, 3 parts of titanium diboride, 4 parts of aluminum nitride, 5 parts of aluminum oxide, and 8 parts of titanium dioxide are mixed evenly according to weight to obtain a base material, 5% of an additive relative to the weight of the base material is added and stirred and dispersed to obtain a mixed powder, the mixed powder is loaded into a mold and pressed under a pressure of 70 MPa to obtain a ceramic body, fired at 250°C for 5h, heated to 750°C at a heating rate of 4°C / min, kept warm and fired for 3h, then heated to 1150°C at a heating rate of 4°C / min, kept warm and fired for 3h, and naturally cooled to room temperature after sintering.

[0080] Among them, the additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of 35:7.5:3:18; the binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid; the dispersant includes sodium dodecylbenzene sulfonate and polyvinyl ester in a weight ratio of 1:5.

[0081] Test Example: The wear-resistant quartz sand ceramic materials prepared in the above-mentioned Examples 1-4 and Comparative Examples 1-6 were subjected to the following tests.

[0082] 1. Compressive strength: tested in accordance with GB / T17671-1999 standard;

[0083] 2. Wear resistance: Tested in accordance with GB / T3810.7 standard; wear resistance grade is 1-5, with grade 5 being the best and grade 1 being the worst. Grade 0: wear begins to appear at a grinding speed of 100; Grade 1: wear begins to appear at a grinding speed of 150; Grade 2: wear begins to appear at a grinding speed of 600; Grade 3: wear begins to appear at a grinding speed of 755; Grade 4: wear begins to appear at a grinding speed of 2100; Grade 5: wear begins to appear at a grinding speed greater than 12000;

[0084] 3. Thermal stability: Repeatedly raise and lower the temperature of the sample between room temperature and 500℃ for 100 times, and then use a metal crack detector to detect cracks. A small number of cracks: the number of cracks per cubic centimeter is 1 to 5; fine cracks: the number of cracks per cubic centimeter is more than 10.

[0085] The test results are shown in Table 1:

[0086] Table 1: Effect test

[0087]

[0088]

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A process for preparing wear-resistant quartz sand ceramic material, characterized in that the steps include: After pre-treatment, quartz sand is mixed with iron oxide modified kaolin, barium carbonate, titanium diboride, aluminum nitride, aluminum oxide and titanium dioxide to obtain a base material; 3-7% of additives relative to the weight of the base material are added, and the mixture is stirred and dispersed to obtain a mixed powder; the mixed powder is placed in a mold and pressed to obtain a ceramic body, which is sintered and then naturally cooled to room temperature to obtain a ceramic body; wherein the preparation method of the iron oxide modified kaolin comprises: calcining kaolin with a particle size of 70-80 μm at 800-840 ° C; The mixture is calcined for 2-3 hours, cooled to room temperature, mixed with cocamidopropyl betaine and ethanol, and iron oxide is added at a temperature of 60-80°C and a stirring speed of 140-160 rpm. The mixture is stirred for 120-140 minutes, dried at 100-110°C to constant weight, and ground to obtain the product. The weight ratio of the kaolin, cocamidopropyl betaine, ethanol and iron oxide is (1-2): (0.2-0.3): (2-3): (0.5-1).

2. The preparation process of a wear-resistant quartz sand ceramic material according to claim 1, characterized in that: The pretreatment steps of the quartz sand include: immersing the quartz sand in a 20-30% HCl aqueous solution for 24-26 hours, rinsing with deionized water until neutral, drying and grinding at 60-80° C., and finally passing through a 100-200 mesh sieve.

3. The preparation process of a wear-resistant quartz sand ceramic material according to claim 1, characterized in that: The base material comprises the following materials in parts by weight: 8-12 parts of pretreated quartz sand, 10-12 parts of iron oxide modified kaolin, 4-6 parts of barium carbonate, 2-4 parts of titanium diboride, 3-5 parts of aluminum nitride, 4-6 parts of aluminum oxide, and 6-10 parts of titanium dioxide.

4. The preparation process of a wear-resistant quartz sand ceramic material according to claim 3, characterized in that: The additives include a binder, a plasticizer, a lubricant and a dispersant in a weight ratio of (20-50): (5-10): (1-5): (6-30).

5. The preparation process of a wear-resistant quartz sand ceramic material according to claim 4, characterized in that: The binder is polyvinyl alcohol, the plasticizer is emulsified paraffin, and the lubricant is oleic acid.

6. The preparation process of a wear-resistant quartz sand ceramic material according to claim 5, characterized in that: The dispersant comprises sodium dodecylbenzenesulfonate and polyacrylate in a weight ratio of 1:

5.

7. The preparation process of a wear-resistant quartz sand ceramic material according to claim 1, characterized in that: The pressure during the pressing is 60-80 MPa.

8. The preparation process of a wear-resistant quartz sand ceramic material according to claim 1, characterized in that: The sintering steps include: firing at 200-300°C for 4-6 hours, heating to 700-800°C at a heating rate of 3-5°C / min, keeping warm and firing for 2-4 hours, then heating to 1100-1200°C at a heating rate of 3-5°C / min, and keeping warm and firing for 2-4 hours.

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