Environmentally friendly corrosion-resistant ceramic and preparation method thereof

Abstract

The invention discloses an environmentally friendly corrosion-resistant ceramic and a preparation method thereof, belonging to the field of ceramics, and the method comprises: step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixture; stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride and zirconium oxide to obtain a second mixture; adding the first mixture and the second mixture to a dispersed solution to obtain a mixed slurry; step S2: the slurry is made into an embryo; step S3: placing the embryo in a sintering furnace and heating it to 320-450°C for 1-2.5h in a first atmosphere environment; step S4: heating it to 1060-1250°C for 2-7h in a second atmosphere environment; step S5: then heating it to 1350-1420°C for 4-8h in a third atmosphere environment; the first atmosphere environment, the second atmosphere environment and the third atmosphere environment include a vacuum environment or an inert atmosphere. The ceramic prepared by the method is corrosion-resistant, has high mechanical strength and good wear resistance.

Description

Technical Field

[0001] The invention belongs to the field of ceramics, and in particular relates to an environmentally friendly corrosion-resistant ceramic and a preparation method thereof. Background Art

[0002] With the development of ceramic materials, the performance of ceramic materials is getting better and better, and the application environment of ceramics is also increasing. Ceramics can be prepared into art ornaments, ceramic kitchen utensils, utensils, etc. Since ceramics have excellent performance in mechanical strength, high temperature resistance, wear resistance, insulation, etc., they can be applied to many fields and are widely used in metallurgy, chemical industry, electrical, aerospace, new energy, machinery and other fields. The performance requirements for ceramics are different in different use environments. For example, in the electrical field, ceramics need to have good insulation. During use, in addition to having strong mechanical strength, ceramics also need to meet corrosion resistance requirements under some acidic and alkaline conditions. However, the corrosion resistance of ceramics prepared by existing technology processes is not good and cannot meet the use requirements. Summary of the invention

[0003] The invention provides an environmentally friendly corrosion-resistant ceramic and a preparation method thereof, which are used to solve the problem that the corrosion resistance of the ceramic is poor.

[0004] The present invention provides a method for preparing an environmentally friendly corrosion-resistant ceramic, comprising:

[0005] Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material;

[0006] Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture;

[0007] Then, the first mixed material and the second mixed material are added into the dispersion solution and mixed to obtain a mixed slurry;

[0008] Step S2: preparing an embryo body from the mixed slurry;

[0009] Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 320-450° C. in a first atmosphere for 1-2.5 hours;

[0010] Step S4: raising the temperature of the sintering furnace from the first temperature of 320-450° C. to the second temperature of 1060-1250° C. in the second atmosphere for 2-7 hours;

[0011] Step S5: raising the temperature of the sintering furnace from the second temperature 1060-1250° C. to the third temperature 1350-1420° C. and treating in a third atmosphere for 4-8 hours;

[0012] The first atmosphere environment includes a vacuum environment or an inert atmosphere, the second atmosphere environment includes a vacuum environment or an inert atmosphere, and the third atmosphere environment includes a vacuum environment or an inert atmosphere.

[0013] Optionally, the raw material components include:

[0014] Kaolin 7-16 parts by weight;

[0015] 4-9 parts by weight of silicon dioxide;

[0016] 4-8 parts by weight of titanium dioxide;

[0017] Alumina 3-7 parts by weight;

[0018] 2-5 parts by weight of titanium boride;

[0019] 2-6 parts by weight of zirconium oxide;

[0020] Boron oxide 4-9 parts by weight;

[0021] Boron 1-2.8 parts by weight;

[0022] Magnesium 0.6-1.6 parts by weight;

[0023] Aluminum 0.5-1.5 parts by weight;

[0024] Silicon 0.5-1.2 parts by weight;

[0025] Carbon powder 0.7-1.8 parts by weight.

[0026] Optionally, the second atmosphere includes argon and nitrogen.

[0027] Optionally, step S4 includes:

[0028] The sintering furnace is first heated from the first temperature of 320-450°C to the treatment temperature of 950-1030°C and treated in the treatment gas for 1-3 hours;

[0029] Then, the temperature is raised from the treatment temperature of 950-1030° C. to a second temperature of 1060-1250° C. and treated in a second atmosphere for 1-4 hours;

[0030] The processing gas includes nitrogen and argon, and the second atmosphere environment includes argon, nitrogen, methane, and diborane.

[0031] Optionally, the third atmosphere environment includes argon gas and nitrogen gas.

[0032] Optionally, the kaolin is modified kaolin, and the preparation method of the modified kaolin includes:

[0033] The kaolin is washed with water and dried;

[0034] Placing kaolin in a first treatment atmosphere at 700-950° C. for 0.5-1.5 h;

[0035] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0036] The mixed powder is placed in a second treatment atmosphere at 1300-1650° C. for 1-2.5 hours;

[0037] After cooling, grinding is performed to obtain modified kaolin;

[0038] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 3-8%;

[0039] The titanium powder in the mixed powder is 0.2-0.6% of the mass of kaolin, the second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane, the volume of boron trichloride in the second treatment atmosphere is 6-12%, the volume of methane in the second treatment atmosphere is 5-15%, and the volume of silane in the second treatment atmosphere is 3-7%. Optionally, the third atmosphere environment also includes methane and silane.

[0040] Optionally, after step S5, the method further includes:

[0041] Step S6: adjusting the temperature of the sintering furnace to 1450-1560° C. and treating in the fourth atmosphere for 1-3 hours;

[0042] The fourth atmosphere includes nitrogen, boron trichloride and methane.

[0043] Optionally, the fourth atmosphere is a mixture of nitrogen, boron trichloride and methane, the volume of boron trichloride is 6-12% of the volume of the mixture, and the volume of methane is 5-15% of the volume of the mixture.

[0044] Optionally, after step S5 and before step S6, the method further includes:

[0045] Cool the embryo in the sintering furnace to 30-70°C and place it in acidic gas for 0.2-1h;

[0046] The sintering furnace is evacuated;

[0047] The sintered embryo body is adjusted to a temperature of 50-90°C and placed in ammonia for 0.5-1h;

[0048] Then adjust the temperature of the embryo in the sintering furnace to 1240-1320°C and place it in nitrogen for 0.5-2h.

[0049] The environmentally friendly corrosion-resistant ceramics according to the embodiments of the present invention are prepared by the preparation method described in the above embodiments.

[0050] The preparation method of the environmentally friendly corrosion-resistant ceramic of the embodiment of the present invention comprises: step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixture; stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride and zirconium oxide to obtain a second mixture; then adding the first mixture and the second mixture into a dispersed solution and mixing them to obtain a mixed slurry; step S2: making the mixed slurry into an embryo body; step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 320-450° C. in a first atmosphere Step S4: heating the sintering furnace from the first temperature 320-450°C to the second temperature 1060-1250°C and treating it in the second atmosphere for 2-7h; Step S5: heating the sintering furnace from the second temperature 1060-1250°C to the third temperature 1350-1420°C and treating it in the third atmosphere for 4-8h; the first atmosphere includes a vacuum environment or an inert atmosphere, the second atmosphere includes a vacuum environment or an inert atmosphere, and the third atmosphere includes a vacuum environment or an inert atmosphere. The ceramic prepared by the method of the present invention has good corrosion resistance, is not easy to corrode during use, can keep the outer surface stable and intact, has high mechanical strength and good wear resistance, and can meet the use requirements in various environments. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described below in conjunction with the embodiments of the present invention. The embodiments described in the present invention are part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The method for preparing the environmentally friendly corrosion-resistant ceramic according to the embodiment of the present invention comprises:

[0053] Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material;

[0054] Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture;

[0055] Then, the first mixed material and the second mixed material are added into a dispersion solution and mixed to obtain a mixed slurry; the dispersion solution may be an aqueous solution of ethanol;

[0056] Step S2: preparing an embryo body from the mixed slurry;

[0057] Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 320-450° C. in a first atmosphere for 1-2.5 hours;

[0058] Step S4: raising the temperature of the sintering furnace from the first temperature of 320-450° C. to the second temperature of 1060-1250° C. in the second atmosphere for 2-7 hours;

[0059] Step S5: raising the temperature of the sintering furnace from the second temperature 1060-1250° C. to the third temperature 1350-1420° C. and treating in a third atmosphere for 4-8 hours;

[0060] The first atmosphere environment includes a vacuum environment or an inert atmosphere, the second atmosphere environment includes a vacuum environment or an inert atmosphere, and the third atmosphere environment includes a vacuum environment or an inert atmosphere.

[0061] The ceramic prepared by the method of the present invention has good corrosion resistance, is not easy to corrode during use, can maintain the stability and integrity of the outer surface, has high mechanical strength and good wear resistance, and can meet the use requirements in various environments.

[0062] In an embodiment of the present invention, the raw material components may include:

[0063] Kaolin 7-16 parts by weight;

[0064] 4-9 parts by weight of silicon dioxide;

[0065] 4-8 parts by weight of titanium dioxide;

[0066] Alumina 3-7 parts by weight;

[0067] 2-5 parts by weight of titanium boride;

[0068] 2-6 parts by weight of zirconium oxide;

[0069] Boron oxide 4-9 parts by weight;

[0070] Boron 1-2.8 parts by weight;

[0071] Magnesium 0.6-1.6 parts by weight;

[0072] Aluminum 0.5-1.5 parts by weight;

[0073] Silicon 0.5-1.2 parts by weight;

[0074] Carbon powder 0.7-1.8 parts by weight.

[0075] The raw material components may be ground into powder form, and the mixing may be performed by grinding.

[0076] In an embodiment of the present invention, the second atmosphere may include argon and nitrogen.

[0077] According to some embodiments, step S4 may include:

[0078] The sintering furnace is first heated from the first temperature of 320-450°C to the treatment temperature of 950-1030°C and treated in the treatment gas for 1-3 hours;

[0079] Then, the temperature is raised from the treatment temperature of 950-1030° C. to a second temperature of 1060-1250° C. and treated in a second atmosphere for 1-4 hours;

[0080] The processing gas may include nitrogen and argon, and the second atmosphere environment includes argon, nitrogen, methane, and diborane. The processing gas may be a mixture of nitrogen and argon, and the volume of nitrogen in the processing gas may be 8-13% of the volume of the mixture; the second atmosphere environment may be a mixture of argon, nitrogen, methane, and diborane, and the volume of nitrogen in the mixture may be 4-9% of the volume of the mixture, the volume of methane in the mixture may be 5-14% of the volume of the mixture, and the volume of diborane in the mixture may be 3-10% of the volume of the mixture.

[0081] According to some embodiments of the present invention, the third atmosphere environment includes argon gas and nitrogen gas.

[0082] In some embodiments of the present invention, the kaolin is modified kaolin, and the preparation method of the modified kaolin includes:

[0083] The kaolin is washed with water and dried;

[0084] Placing kaolin in a first treatment atmosphere at 700-950° C. for 0.5-1.5 h;

[0085] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0086] The mixed powder is placed in a second treatment atmosphere at 1300-1650° C. for 1-2.5 hours;

[0087] After cooling, grinding is performed to obtain modified kaolin;

[0088] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 3-8%;

[0089] The titanium powder in the mixed powder is 0.2-0.6% of the mass of kaolin, and the second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 6-12%, the volume of methane in the second treatment atmosphere is 5-15%, and the volume of silane in the second treatment atmosphere is 3-7%. The decomposition products of boron trichloride, methane and silane in the treatment gas can react with the raw material components, and the interaction between the products and the components is conducive to improving the structure of the ceramic crystal and the performance of the ceramic.

[0090] In an embodiment of the present invention, the third atmosphere environment further includes methane and silane.

[0091] According to some other embodiments, after step S5, the following steps may also be included:

[0092] Step S6: adjusting the temperature of the sintering furnace to 1450-1560° C. and treating in the fourth atmosphere for 1-3 hours;

[0093] The fourth atmosphere includes nitrogen, boron trichloride and methane.

[0094] In some embodiments, the fourth atmosphere is a mixture of nitrogen, boron trichloride and methane, the volume of boron trichloride is 6-12% of the volume of the mixture, and the volume of methane is 5-15% of the volume of the mixture.

[0095] In an embodiment of the present invention, after step S5 and before step S6, the following may also be included:

[0096] Cool the embryo in the sintering furnace to 30-70°C and place it in acidic gas for 0.2-1h;

[0097] The sintering furnace is evacuated;

[0098] The sintered embryo body is adjusted to a temperature of 50-90°C and placed in ammonia for 0.5-1h;

[0099] Then adjust the temperature of the embryo in the sintering furnace to 1240-1320°C and place it in nitrogen for 0.5-2h. The acidic gas can be hydrogen chloride gas, nitric acid gas, etc. The acidic and alkaline gases can remove the exposed corrosion-resistant components, and at the same time make the surface easy to combine with subsequent components or compounds, thereby improving the bonding strength.

[0100] The ceramics according to the embodiments of the present invention are prepared by the preparation methods described in the above embodiments.

[0101] Some specific embodiments of the present invention are as follows. Example 1

[0102] The method for preparing environmentally friendly corrosion-resistant ceramics comprises the following steps:

[0103] Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material;

[0104] Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture;

[0105] Then, the first mixed material and the second mixed material are added into the dispersion solution and mixed to obtain a mixed slurry; the dispersion solution is an aqueous solution of ethanol;

[0106] Step S2: preparing an embryo body from the mixed slurry;

[0107] Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 320° C. in a first atmosphere for 2.5 hours;

[0108] Step S4: raising the temperature of the sintering furnace from the first temperature of 320° C. to the second temperature of 1060° C. in the second atmosphere for 7 hours;

[0109] Step S5: raising the temperature of the sintering furnace from the second temperature 1060° C. to the third temperature 1420° C. and treating in the third atmosphere for 4 hours;

[0110] The first atmosphere is a vacuum environment; the second atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 7% of the volume of the mixture; the third atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 12% of the volume of the mixture;

[0111] Among them, the raw material components include:

[0112] 7 parts by weight of kaolin, 4 parts by weight of silicon dioxide, 8 parts by weight of titanium dioxide,

[0113] 3 parts by weight of aluminum oxide, 5 parts by weight of titanium boride, 2 parts by weight of zirconium oxide,

[0114] 9 parts by weight of boron oxide, 1 part by weight of boron, 0.6 parts by weight of magnesium,

[0115] 0.5 parts by weight of aluminum, 1.2 parts by weight of silicon, and 0.7 parts by weight of carbon powder. Example 2

[0116] The method for preparing environmentally friendly corrosion-resistant ceramics comprises the following steps:

[0117] Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material;

[0118] Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture;

[0119] Then, the first mixed material and the second mixed material are added into the dispersion solution and mixed to obtain a mixed slurry; the dispersion solution is an aqueous solution of ethanol;

[0120] Step S2: preparing an embryo body from the mixed slurry;

[0121] Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 450° C. in a first atmosphere for 1 hour;

[0122] Step S4: raising the temperature of the sintering furnace from the first temperature of 450° C. to the second temperature of 1250° C. in the second atmosphere for 2 hours;

[0123] Step S5: raising the temperature of the sintering furnace from the second temperature of 1250° C. to the third temperature of 1350° C. and treating in a third atmosphere for 8 hours;

[0124] The first atmosphere is a vacuum environment; the second atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 15% of the volume of the mixture; the third atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 5% of the volume of the mixture;

[0125] Among them, the raw material components include:

[0126] 16 parts by weight of kaolin, 9 parts by weight of silicon dioxide, 4 parts by weight of titanium dioxide,

[0127] 7 parts by weight of aluminum oxide, 2 parts by weight of titanium boride, 6 parts by weight of zirconium oxide,

[0128] 4 parts by weight of boron oxide, 2.8 parts by weight of boron, 1.6 parts by weight of magnesium,

[0129] 1.5 parts by weight of aluminum, 0.5 parts by weight of silicon, and 1.8 parts by weight of carbon powder. Example 3

[0130] The method for preparing environmentally friendly corrosion-resistant ceramics comprises the following steps:

[0131] Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material;

[0132] Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture;

[0133] Then, the first mixed material and the second mixed material are added into the dispersion solution and mixed to obtain a mixed slurry; the dispersion solution is an aqueous solution of ethanol;

[0134] Step S2: preparing an embryo body from the mixed slurry;

[0135] Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 380° C. in a first atmosphere for 1.5 hours;

[0136] Step S4: raising the temperature of the sintering furnace from the first temperature of 380° C. to the second temperature of 1150° C. in the second atmosphere for 4 hours;

[0137] Step S5: raising the temperature of the sintering furnace from the second temperature of 1150° C. to the third temperature of 1380° C. in a third atmosphere for 6 hours;

[0138] The first atmosphere is a vacuum environment; the second atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 9% of the volume of the mixture; the third atmosphere is a mixture of argon and nitrogen, with the volume of nitrogen accounting for 8% of the volume of the mixture;

[0139] Among them, the raw material components include:

[0140] 13 parts by weight of kaolin, 6 parts by weight of silicon dioxide, 6 parts by weight of titanium dioxide,

[0141] 5 parts by weight of aluminum oxide, 3 parts by weight of titanium boride, 3 parts by weight of zirconium oxide,

[0142] 6 parts by weight of boron oxide, 1.6 parts by weight of boron, 0.9 parts by weight of magnesium,

[0143] 0.8 parts by weight of aluminum, 0.7 parts by weight of silicon, and 1.1 parts by weight of carbon powder. Example 4

[0144] The difference between Example 4 and Example 3 is that:

[0145] In step S4, step S4 includes:

[0146] The sintering furnace is first heated from the first temperature of 380°C to the treatment temperature of 950°C and treated in the treatment gas for 3 hours;

[0147] Then the temperature is raised from the treatment temperature of 950° C. to a second temperature of 1150° C. and treated in a second atmosphere for 1 hour;

[0148] The processing gas is a mixture of nitrogen and argon, and the volume of nitrogen in the processing gas is 8% of the volume of the mixture; the second atmosphere environment is a mixture of argon, nitrogen, methane, and diborane, and the volume of nitrogen in the mixture is 9% of the volume of the mixture, the volume of methane in the mixture is 14% of the volume of the mixture, and the volume of diborane in the mixture is 3% of the volume of the mixture. Example 5

[0149] The difference between Example 5 and Example 3 is that:

[0150] In step S4, step S4 includes:

[0151] The sintering furnace is first heated from the first temperature of 380°C to the treatment temperature of 1030°C and treated in the treatment gas for 1 hour;

[0152] Then the temperature is raised from the treatment temperature of 1030° C. to a second temperature of 1150° C. and treated in a second atmosphere for 1 hour;

[0153] The processing gas is a mixture of nitrogen and argon, and the volume of nitrogen in the processing gas is 13% of the volume of the mixture; the second atmosphere environment is a mixture of argon, nitrogen, methane, and diborane, and the volume of nitrogen in the mixture is 4% of the volume of the mixture, the volume of methane in the mixture is 5% of the volume of the mixture, and the volume of diborane in the mixture is 10% of the volume of the mixture. Example 6

[0154] The difference between Example 6 and Example 3 is that:

[0155] The third atmosphere environment is a mixture of argon, nitrogen, methane and silane, wherein the volume of nitrogen is 5% of the volume of the mixture, the volume of methane is 7% of the volume of the mixture, and the volume of silane is 5% of the volume of the mixture. Example 7

[0156] The difference between Example 7 and Example 3 is that:

[0157] The third atmosphere environment is a mixture of argon, nitrogen, methane and silane, wherein the volume of nitrogen is 9% of the volume of the mixture, the volume of methane is 4% of the volume of the mixture, and the volume of silane is 8% of the volume of the mixture. Example 8

[0158] The difference between Example 8 and Example 7 is that:

[0159] After step S5, the method further includes:

[0160] Step S6: adjusting the sintering furnace temperature to 1450° C. and treating in the fourth atmosphere for 3 hours;

[0161] The fourth atmosphere environment is a mixture of nitrogen, boron trichloride and methane, wherein the volume of boron trichloride is 6% of the volume of the mixture, and the volume of methane is 5% of the volume of the mixture. Example 9

[0162] The difference between Example 9 and Example 7 is that:

[0163] After step S5, the method further includes:

[0164] Step S6: adjusting the sintering furnace temperature to 1560° C. and treating in the fourth atmosphere for 1 hour;

[0165] The fourth atmosphere environment is a mixture of nitrogen, boron trichloride and methane, wherein the volume of boron trichloride is 12% of the volume of the mixture, and the volume of methane is 15% of the volume of the mixture. Example 10

[0166] The difference between Example 10 and Example 8 is that:

[0167] After step S5 and before step S6, the method further includes:

[0168] The embryo body in the sintering furnace was cooled to 30°C and placed in hydrogen chloride gas for 1 hour;

[0169] The sintering furnace is evacuated;

[0170] The sintered embryo body was adjusted to 50°C and placed in ammonia for 1 hour;

[0171] The temperature of the embryo in the sintering furnace was then adjusted to 1240°C and placed in nitrogen for 2 hours. Embodiment 11

[0172] The difference between Example 11 and Example 8 is that:

[0173] After step S5 and before step S6, the method further includes:

[0174] The embryo body in the sintering furnace was cooled to 70°C and placed in hydrogen chloride gas for 0.2h;

[0175] The sintering furnace is evacuated;

[0176] The sintered embryo body was adjusted to 90°C and placed in ammonia for 0.5h;

[0177] The temperature of the embryo in the sintering furnace was then adjusted to 1320° C. and placed in nitrogen for 0.5 h. Example 12

[0178] The difference between Example 12 and Example 3 is that:

[0179] The kaolin is modified kaolin, and the preparation method of the modified kaolin is:

[0180] The kaolin is washed with water and dried;

[0181] The kaolin is placed in a first treatment atmosphere and treated at 700° C. for 1.5 h;

[0182] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0183] The mixed powder is placed in a second treatment atmosphere and treated at 1650° C. for 1 h;

[0184] After cooling, grinding is performed to obtain modified kaolin;

[0185] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 3%;

[0186] The titanium powder in the mixed powder is 0.6% of the mass of kaolin. The second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 12%, the volume of methane in the second treatment atmosphere is 15%, and the volume of silane in the second treatment atmosphere is 3%. Example 13

[0187] The difference between Example 13 and Example 3 is that:

[0188] The kaolin is modified kaolin, and the preparation method of the modified kaolin is:

[0189] The kaolin is washed with water and dried;

[0190] The kaolin is placed in a first treatment atmosphere and treated at 950° C. for 0.5 h;

[0191] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0192] The mixed powder is placed in a second treatment atmosphere and treated at 1300° C. for 2.5 h;

[0193] After cooling, grinding is performed to obtain modified kaolin;

[0194] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 8%;

[0195] The titanium powder in the mixed powder accounts for 0.6% of the mass of kaolin. The second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 6%, the volume of methane in the second treatment atmosphere is 5%, and the volume of silane in the second treatment atmosphere is 7%. Embodiment 14

[0196] The difference between Example 14 and Example 8 is that:

[0197] The kaolin is modified kaolin, and the preparation method of the modified kaolin is:

[0198] The kaolin is washed with water and dried;

[0199] The kaolin is placed in a first treatment atmosphere and treated at 700° C. for 1.5 h;

[0200] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0201] The mixed powder is placed in a second treatment atmosphere and treated at 1650° C. for 1 h;

[0202] After cooling, grinding is performed to obtain modified kaolin;

[0203] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 3%;

[0204] The titanium powder in the mixed powder is 0.6% of the mass of kaolin. The second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 12%, the volume of methane in the second treatment atmosphere is 15%, and the volume of silane in the second treatment atmosphere is 3%. Embodiment 15

[0205] The difference between Example 15 and Example 8 is that:

[0206] The kaolin is modified kaolin, and the preparation method of the modified kaolin is:

[0207] The kaolin is washed with water and dried;

[0208] The kaolin is placed in a first treatment atmosphere and treated at 950° C. for 0.5 h;

[0209] Grinding and mixing kaolin and titanium powder to obtain mixed powder;

[0210] The mixed powder is placed in a second treatment atmosphere and treated at 1300° C. for 2.5 h;

[0211] After cooling, grinding is performed to obtain modified kaolin;

[0212] The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 8%;

[0213] The titanium powder in the mixed powder accounts for 0.6% of the mass of kaolin. The second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 6%, the volume of methane in the second treatment atmosphere is 5%, and the volume of silane in the second treatment atmosphere is 7%.

[0214] The performance of the ceramics prepared in the above examples was tested, and the specific test results are shown in Table 1.

[0215] Acid resistance test: Wash the ceramic with deionized water and dry it, weigh the ceramic, soak the ceramic in a 0.8 mol / L hydrochloric acid solution at 30°C for 120 hours, wash it with deionized water, dry it, weigh the ceramic again, and compare the mass changes before and after.

[0216] Alkali resistance test: Wash the ceramic with deionized water and dry it, weigh the ceramic, soak the ceramic in a 0.8 mol / L sodium hydroxide solution at 30°C for 120 hours, take it out and wash it with deionized water, then dry it, weigh the ceramic again, and compare the mass changes before and after.

[0217]

[0218] It can be seen from Table 1 that the ceramics prepared by the method in the above embodiment of the present invention have good wear resistance, high tensile strength, high mechanical strength, no cracks, strong corrosion resistance, can meet the use under various conditions, have good durability, and good long-term stability.

[0219] Some specific embodiments of the present invention are provided above and described in detail. The protection scope of the present invention is not limited to the above specific embodiments. Improvements made by those skilled in the art based on common knowledge or conventional techniques also fall within the protection scope of the present invention.

Claims

1. A method for preparing environmentally friendly corrosion-resistant ceramics, characterized in that: include: Step S1: mixing boron oxide, boron, magnesium, aluminum, silicon and carbon powder to obtain a first mixed material; Stirring and mixing kaolin, silicon dioxide, titanium dioxide, aluminum oxide, titanium boride, and zirconium oxide to obtain a second mixture; Then, the first mixed material and the second mixed material are added into the dispersion solution and mixed to obtain a mixed slurry; Step S2: preparing an embryo body from the mixed slurry; Step S3: placing the embryo body in a sintering furnace and heating it to a first temperature of 320-450° C. in a first atmosphere for 1-2.5 hours; Step S4: raising the temperature of the sintering furnace from the first temperature of 320-450° C. to the second temperature of 1060-1250° C. in the second atmosphere for 2-7 hours; Step S5: raising the temperature of the sintering furnace from the second temperature 1060-1250° C. to the third temperature 1350-1420° C. and treating in a third atmosphere for 4-8 hours; The first atmosphere environment includes a vacuum environment or an inert atmosphere, and the second atmosphere environment includes a vacuum environment or an inert atmosphere; The raw material components for preparing ceramics include: Kaolin 7-16 parts by weight; 4-9 parts by weight of silicon dioxide; 4-8 parts by weight of titanium dioxide; Alumina 3-7 parts by weight; 2-5 parts by weight of titanium boride; 2-6 parts by weight of zirconium oxide; Boron oxide 4-9 parts by weight; Boron 1-2.8 parts by weight; Magnesium 0.6-1.6 parts by weight; Aluminum 0.5-1.5 parts by weight; Silicon 0.5-1.2 parts by weight; Carbon powder 0.7-1.8 parts by weight; The third atmosphere environment includes argon and nitrogen; The kaolin is modified kaolin, and the preparation method of the modified kaolin includes: The kaolin is washed with water and dried; Placing kaolin in a first treatment atmosphere at 700-950° C. for 0.5-1.5 h; Grinding and mixing kaolin and titanium powder to obtain mixed powder; The mixed powder is placed in a second treatment atmosphere at 1300-1650° C. for 1-2.5 hours; After cooling, grinding is performed to obtain modified kaolin; The first processing atmosphere is a mixture of nitrogen and methane, and the volume of methane in the first processing atmosphere is 3-8%; The titanium powder in the mixed powder is 0.2-0.6% of the mass of kaolin, and the second treatment atmosphere is a mixture of nitrogen, boron trichloride, methane and silane. The volume of boron trichloride in the second treatment atmosphere is 6-12%, the volume of methane in the second treatment atmosphere is 5-15%, and the volume of silane in the second treatment atmosphere is 3-7%.

2. The preparation method according to claim 1, characterized in that: After step S5, the method further includes: Step S6: adjusting the temperature of the sintering furnace to 1450-1560° C. and treating in the fourth atmosphere for 1-3 hours; The fourth atmosphere includes nitrogen, boron trichloride and methane.

3. The preparation method according to claim 2, characterized in that: The fourth atmosphere is a mixture of nitrogen, boron trichloride and methane, wherein the volume of boron trichloride is 6-12% of the volume of the mixture, and the volume of methane is 5-15% of the volume of the mixture.

4. The preparation method according to claim 2, characterized in that: After step S5 and before step S6, the method further includes: Cool the embryo in the sintering furnace to 30-70°C and place it in acidic gas for 0.2-1h; The sintering furnace is evacuated; The sintered embryo body is adjusted to a temperature of 50-90°C and placed in ammonia for 0.5-1h; Then adjust the temperature of the embryo in the sintering furnace to 1240-1320°C and place it in nitrogen for 0.5-2h.

5. An environmentally friendly corrosion-resistant ceramic, characterized in that: Prepared by the preparation method described in any one of claims 1 to 4.

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