CN111439999A - Silicon nitride and silicon carbide combined refractory material and preparation method thereof - Google Patents
Silicon nitride and silicon carbide combined refractory material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a silicon nitride and silicon carbide combined refractory material and a preparation method thereof, wherein the silicon nitride and silicon carbide combined refractory material comprises the following raw materials: silicon nitride, silicon carbide, magnesia, modified ceramic particles, glass fiber, attapulgite, talc, graphene and aluminum silicate; the silicon nitride and silicon carbide combined refractory material has better refractory performance and corrosion resistance, can avoid chemical corrosion and mechanical abrasion of the refractory material, and has the capabilities of resisting stress and coping with temperature change in high-temperature and corrosive environments, thereby having longer service life.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a silicon nitride and silicon carbide combined refractory material and a preparation method thereof.
Background
The refractory material prepared by combining silicon nitride and silicon carbide at present is more and more widely applied, and the refractory material has better strength and heat resistance on one hand, can save energy, reduce consumption and has longer service life on the other hand. However, long-term tests and practical use find that the silicon nitride-bonded silicon carbide refractory material has certain defects in the performance of resisting corrosion of molten metal liquid, slag and the like, the service life of the silicon nitride-bonded silicon carbide refractory material is seriously threatened when the silicon nitride-bonded silicon carbide refractory material is in a high-temperature and corrosion environment for a long time, and meanwhile, the refractory material is easily damaged due to long-term high heat and corrosion and is not easy to repair, so that the cost is easily increased, and economic loss is caused.
Chinese patent CN102838361A discloses a MgCa-SiC-C refractory material, belonging to the technical field of refractory materials. The MgCa-SiC-C refractory material comprises: electrically fused or sintered magnesia-calcium sand or magnesia-dolomite sand particles, electrically fused or sintered magnesia fine powder, silicon carbide, graphite, an additive and an anhydrous resin bonding agent. The invention also discloses a preparation method of the MgCa-SiC-C refractory material. The MgCa-SiC-C refractory material can be applied to a high-temperature vessel for ferrous metallurgy, particularly can be used as the lining of a ladle for iron making, and can meet the smelting requirement of a pretreated ladle.
Chinese patent CN101798232B discloses a preparation method of sialon-silicon carbide-corundum composite refractory material. The raw materials comprise: corundum, silicon carbide particles, silicon carbide fine powder and sialon. Adding silicon carbide particles into a planetary mixer, mixing for 4-6 minutes, adding silicon carbide fine powder, corundum and sialon, mixing for 8-12 minutes, adding a bonding agent accounting for 3-4% of the total mass of the raw materials, and mixing for 25-35 minutes in the planetary mixer; pressing into a refractory brick blank; drying at 30-150 deg.C; placing the mixture in a nitriding furnace, filling high-purity nitrogen, continuously heating, sintering, cooling and cooling. The invention improves the service performance of the refractory brick by the sialon binding phase and obtains obvious use effect, however, the composite refractory material of the invention has lower refractoriness and limited application field.
Chinese patent CN108623313A discloses a preparation method of a silicon nitride and silicon carbide combined refractory material, which comprises the steps of mixing silicon carbide, silicon nitride and a coupling agent, and grinding to obtain surface-modified silicon carbide and silicon nitride; carrying out grafting reaction on the calcium sulfate crystal whisker by using an organic monomer to obtain a modified calcium sulfate crystal whisker; finally, adding the surface-modified silicon carbide, silicon nitride, modified calcium sulfate whiskers, silicon dioxide micropowder, mullite, andalusite and diatomite into an aqueous solution of a binding agent, uniformly stirring, injecting into a mold for molding, demolding, placing into an ethanol aqueous solution for dehydration, and drying after dehydration to obtain a blank; and (4) placing the dried green body into a high-temperature furnace for firing to obtain the ceramic material. The invention takes mullite as aggregate and silicon carbide, silicon nitride and modified calcium sulfate whisker as reinforcing phases to prepare the refractory material, and the obtained refractory material has good physical properties, but the composite refractory material has general corrosion resistance and short service life.
In summary, how to prepare a refractory material by combining silicon nitride and silicon carbide, which has good heat resistance and fire resistance and can always maintain excellent mechanical properties and comprehensive properties in an erosion environment for a long time, is a problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a silicon nitride and silicon carbide combined refractory material, which solves the problems of short service life and poor comprehensive performance of the refractory material prepared by combining silicon nitride and silicon carbide under high-temperature and corrosive environments at present.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a silicon nitride-silicon carbide refractory material comprises the following raw materials in parts by weight: 23 to 46 parts of silicon nitride, 16 to 36 parts of silicon carbide, 2.5 to 3.4 parts of magnesia, 1.6 to 2.2 parts of modified ceramic particles, 3.2 to 4.2 parts of glass fiber, 1.2 to 1.8 parts of attapulgite, 0.85 to 1.25 parts of talcum, 0.36 to 0.46 part of graphene and 1.3 to 2.3 parts of aluminum silicate. The silicon nitride is combined with the silicon carbide, and the magnesia is added, so that the prepared refractory material has better fire resistance and thermal expansion coefficient under the high-temperature environment, and the modified ceramic particles are further added to enhance the binding force and the thermal shock stability and improve the high-temperature resistance; the glass fiber, the attapulgite and the talc can enhance the mechanical property of the invention and improve the wear resistance and the corrosion resistance; the graphene can further improve the high-temperature stability and the fire resistance and improve the comprehensive performance, and the aluminum silicate can enhance the close combination of all the components, improve the stability and enhance the thermal shock stability.
Further, the silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 26 to 42 parts of silicon nitride, 18 to 33 parts of silicon carbide, 2.7 to 3.2 parts of magnesia, 1.8 to 2.1 parts of modified ceramic particles, 3.5 to 4.0 parts of glass fiber, 1.3 to 1.7 parts of attapulgite, 0.92 to 1.18 parts of talcum, 0.37 to 0.42 part of graphene and 1.5 to 2.1 parts of aluminum silicate.
Further, the preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.1-1.6, shaking at 45-55 ℃ for 35-40 min, drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and magnetically stirring at 75-85 ℃ for 20-40 min to obtain the modified ceramic particles.
Further, the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 0.8-1: 0.5: 2.2: 1.2 to 1.6.
Furthermore, the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.6 to 0.8
Furthermore, the content of sodium oxide in the glass fiber is 8.5-9.5%.
In another aspect, the present invention provides a method for preparing the silicon nitride-bonded silicon carbide refractory material, including the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 60-100 meshes, then respectively grinding for 3-6 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 2-4 hours to obtain a composition A for later use;
secondly, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 100-120 meshes, mixing, and calcining at 720-780 ℃ for 1.5-2.5 hours to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing at the speed of 350 r/min-650 r/min for 15 min-25 min, then adding the modified ceramic particles, graphene and aluminum silicate in parts by weight, continuously stirring for 25 min-30 min, then injecting the mixture into a mold for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 4.5% -6.5%, thus obtaining the silicon nitride-silicon carbide combined refractory material.
Further, in the second step, the temperature is kept for 0.5 to 1.0 hour at the temperature of 420 to 500 ℃ before calcination.
Further, in the third step, the molding temperature of the model is 65-85 ℃.
Furthermore, in the third step, the firing process is as follows: firstly, firing for 1.0 to 1.5 hours at the temperature of 760 to 880 ℃, then raising the temperature to 1370 to 1520 ℃ at a constant speed, continuing to calcine for 4.5 to 6.5 hours, and finally cooling along with the furnace.
The invention has the beneficial effects that:
(1) the silicon nitride and silicon carbide combined refractory material has better refractory performance and corrosion resistance, can avoid chemical corrosion and mechanical abrasion of the refractory material, and has the capabilities of resisting stress and coping with temperature change in high-heat and corrosion environments, thereby having longer service life;
(2) the silicon nitride and silicon carbide combined refractory material is added with modified ceramic particles, attapulgite, talc and other fillers, so that the thermal stability and the chemical stability of the silicon nitride and silicon carbide combined refractory material can be improved, and meanwhile, the wear resistance and the spalling resistance are enhanced, thereby expanding the application field;
(3) the silicon nitride and silicon carbide combined refractory material has high refractoriness, low thermal expansion coefficient, good thermal shock stability, rich raw material sources, simple preparation method, low production cost and better economic benefit, and is suitable for wide popularization.
Detailed Description
In order to make the objects, technical solutions and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention.
It should be noted that the described embodiments of the invention are only preferred ways of implementing the invention, and that all obvious modifications, which are within the scope of the invention, are all included in the present general inventive concept.
Example 1
Silicon nitride and silicon carbide combined refractory material
The silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 23kg of silicon nitride, 16kg of silicon carbide, 2.5kg of magnesia, 1.6kg of modified ceramic particles, 3.2kg of glass fibers, 1.2kg of attapulgite, 0.85kg of talc, 0.36kg of graphene and 1.3kg of aluminum silicate.
The preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.1, mixing, shaking for 35min at the temperature of 45 ℃, then drying, stirring and mixing the dried ceramic particles and phenylaminomethyl triethoxysilane, and then magnetically stirring for 20min at the temperature of 75 ℃ to obtain the modified ceramic particles; the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 0.8: 0.5: 2.2: 1.2; the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.6; the content of sodium oxide in the glass fiber was 8.5%.
The preparation method comprises the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 60 meshes, then respectively grinding for 3 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 2 hours to obtain a composition A for later use;
step two, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 100 meshes, mixing, keeping the temperature for 0.5 hour at the temperature of 420 ℃, and then calcining for 1.5 hours at the temperature of 720 ℃ to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing for 15min at the speed of 350r/min, then adding the modified ceramic particles, the graphene and the aluminum silicate in parts by weight, continuously stirring for 25min, then injecting the mixture into a mold at the temperature of 65 ℃ for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 4.5% to obtain the silicon nitride-silicon carbide combined refractory material.
Wherein the firing process comprises the following steps: firstly, firing for 1.0 hour at the temperature of 760 ℃, then uniformly heating to 1370 ℃, continuing to calcine for 4.5 hours, and finally cooling along with the furnace.
Example 2
Silicon nitride and silicon carbide combined refractory material
The silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 46kg of silicon nitride, 36kg of silicon carbide, 3.4kg of magnesia, 2.2kg of modified ceramic particles, 4.2kg of glass fibers, 1.8kg of attapulgite, 1.25kg of talc, 0.46kg of graphene and 2.3kg of aluminum silicate.
The preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.6, shaking for 40min at the temperature of 55 ℃, then drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and then magnetically stirring for 40min at the temperature of 85 ℃ to obtain the modified ceramic particles; the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 1: 0.5: 2.2: 1.6; the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.8; the content of sodium oxide in the glass fiber was 9.5%.
The preparation method comprises the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 100 meshes, then respectively grinding for 6 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 4 hours to obtain a composition A for later use;
step two, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 120 meshes, mixing, keeping the temperature at 500 ℃ for 1.0 hour, and then calcining at 780 ℃ for 2.5 hours to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing at the speed of 650r/min for 25min, then adding the modified ceramic particles, the graphene and the aluminum silicate in parts by weight, continuously stirring for 30min, then injecting the mixture into a mold at the temperature of 85 ℃ for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 6.5% to obtain the silicon nitride-silicon carbide combined refractory material.
Wherein the firing process comprises the following steps: firstly, firing for 1.5 hours at 880 ℃, then uniformly heating to 1520 ℃, continuing to calcine for 6.5 hours, and finally cooling along with the furnace.
Example 3
Silicon nitride and silicon carbide combined refractory material
The silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 26kg of silicon nitride, 18kg of silicon carbide, 2.7kg of magnesia, 1.8kg of modified ceramic particles, 3.5kg of glass fibers, 1.3kg of attapulgite, 0.92kg of talc, 0.37kg of graphene and 1.5kg of aluminum silicate.
The preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.2, mixing, shaking for 36min at the temperature of 48 ℃, then drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and then magnetically stirring for 25min at the temperature of 77 ℃ to obtain the modified ceramic particles; the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 1: 0.5: 2.2: 1.2; the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.8; the content of sodium oxide in the glass fiber was 8.7%.
The preparation method comprises the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 70 meshes, then respectively grinding for 4 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 2.5 hours to obtain a composition A for later use;
step two, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 120 meshes, mixing, preserving heat for 1.0 hour at the temperature of 430 ℃, and then calcining for 2.5 hours at the temperature of 730 ℃ to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing for 17min at the speed of 400r/min, then adding the modified ceramic particles, the graphene and the aluminum silicate in parts by weight, continuing stirring for 26min, then injecting the mixture into a mold at the temperature of 70 ℃ for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 5.0%, thus obtaining the silicon nitride-silicon carbide combined refractory material.
Wherein the firing process comprises the following steps: firstly, firing for 1.5 hours at 780 ℃, then raising the temperature to 1390 ℃ at a constant speed, continuing to calcine for 5.0 hours, and finally cooling along with the furnace.
Example 4
Silicon nitride and silicon carbide combined refractory material
The silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 42kg of silicon nitride, 33kg of silicon carbide, 3.2kg of magnesia, 2.1kg of modified ceramic particles, 4.0kg of glass fibers, 1.7kg of attapulgite, 1.18kg of talc, 0.42kg of graphene and 2.1kg of aluminum silicate.
The preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.5, shaking for 39min at the temperature of 53 ℃, then drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and then magnetically stirring for 35min at the temperature of 83 ℃ to obtain the modified ceramic particles; the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 0.8: 0.5: 2.2: 1.5; the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.6; the content of sodium oxide in the glass fiber was 9.2%.
The preparation method comprises the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 90 meshes, then respectively grinding for 5 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 3.5 hours to obtain a composition A for later use;
step two, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 100 meshes, mixing, keeping the temperature for 0.5 hour at 490 ℃, and then calcining for 1.5 hours at 760 ℃ to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing at the speed of 550r/min for 23min, then adding the modified ceramic particles, the graphene and the aluminum silicate in parts by weight, continuously stirring for 29min, then injecting the mixture into a mold at the temperature of 80 ℃ for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 6.0% to obtain the silicon nitride-silicon carbide combined refractory material.
Wherein the firing process comprises the following steps: firstly, firing for 1.0 hour at the temperature of 840 ℃, then raising the temperature to 1500 ℃ at a constant speed, continuing to calcine for 6.0 hours, and finally cooling along with the furnace.
Example 5
Silicon nitride and silicon carbide combined refractory material
The silicon nitride and silicon carbide combined refractory material comprises the following raw materials in parts by weight: 34kg of silicon nitride, 26kg of silicon carbide, 2.9kg of magnesia, 1.9kg of modified ceramic particles, 3.8kg of glass fibers, 1.5kg of attapulgite, 1.08kg of talc, 0.39kg of graphene and 1.8kg of aluminum silicate.
The preparation process of the modified ceramic particles comprises the following steps: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.4, mixing, shaking for 37min at the temperature of 50 ℃, then drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and then magnetically stirring for 30min at the temperature of 80 ℃ to obtain the modified ceramic particles; the volume ratio of kaolin, clay, feldspar and quartz in the ceramic particles is 0.9: 0.5: 2.2: 1.4; the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.7; the content of sodium oxide in the glass fiber was 9.0%.
The preparation method comprises the following steps:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 80 meshes, then respectively grinding for 4.5 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 3 hours to obtain a composition A for later use;
step two, crushing the glass fiber, the attapulgite and the talc in parts by weight to 110 meshes, mixing, keeping the temperature at 460 ℃ for 0.8 hour, and then calcining at 750 ℃ for 2.0 hours to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing at the speed of 500r/min for 20min, then adding the modified ceramic particles, the graphene and the aluminum silicate in parts by weight, continuously stirring for 28min, then injecting the mixture into a mold at the temperature of 75 ℃ for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 5.5% to obtain the silicon nitride-silicon carbide combined refractory material.
Wherein the firing process comprises the following steps: firstly, firing for 1.3 hours at the temperature of 800 ℃, then raising the temperature to 1420 ℃ at a constant speed, continuing to calcine for 5.5 hours, and finally cooling along with the furnace.
Examples of the experiments
Performing basic performance test on the silicon nitride and silicon carbide combined refractory material prepared in the embodiment 1-5, wherein the volume density and the apparent porosity are measured according to GB/T2997-2000; the normal temperature compressive strength is measured according to GB/T5072-2008; measuring the high-temperature rupture strength according to GB/T3002-2004; the thermal conductivity was also measured. The results are shown in Table 1:
TABLE 1 statistics of the performance of silicon nitride bonded silicon carbide refractory materials prepared in examples 1-5 of the present invention
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Bulk Density (g/cm)3) | 2.12 | 2.35 | 2.26 | 2.18 | 2.24 |
| Apparent porosity (%) | 22.4 | 21.8 | 24.1 | 23.6 | 21.8 |
| Normal temperature compressive strength (MPa) | 77.5 | 78.2 | 80.2 | 81.4 | 79.8 |
| High temperature rupture strength (MPa) | 19.5 | 21.4 | 22.5 | 24.0 | 23.8 |
| Coefficient of thermal conductivity (W/m. K) | 2.85 | 2.73 | 2.86 | 2.79 | 2.88 |
The results in table 1 show that the silicon nitride-bonded silicon carbide refractory materials prepared in embodiments 1 to 5 of the present invention have good room temperature compressive strength and high temperature rupture strength, small thermal conductivity, good comprehensive properties, long service life, and high safety.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The silicon nitride-bonded silicon carbide refractory material is characterized by comprising the following raw materials in parts by weight: 23 to 46 parts of silicon nitride, 16 to 36 parts of silicon carbide, 2.5 to 3.4 parts of magnesia, 1.6 to 2.2 parts of modified ceramic particles, 3.2 to 4.2 parts of glass fiber, 1.2 to 1.8 parts of attapulgite, 0.85 to 1.25 parts of talcum, 0.36 to 0.46 part of graphene and 1.3 to 2.3 parts of aluminum silicate.
2. The silicon nitride-bonded silicon carbide refractory material of claim 1, wherein the silicon nitride-bonded silicon carbide refractory material comprises the following raw materials in parts by weight: 26 to 42 parts of silicon nitride, 18 to 33 parts of silicon carbide, 2.7 to 3.2 parts of magnesia, 1.8 to 2.1 parts of modified ceramic particles, 3.5 to 4.0 parts of glass fiber, 1.3 to 1.7 parts of attapulgite, 0.92 to 1.18 parts of talcum, 0.37 to 0.42 part of graphene and 1.5 to 2.1 parts of aluminum silicate.
3. The silicon nitride-bonded silicon carbide refractory material of claim 1, wherein the modified ceramic particles are prepared by: mixing ceramic particles and ethanol according to a mass ratio of 1: 1.1-1.6, shaking at 45-55 ℃ for 35-40 min, drying, stirring and mixing the dried ceramic particles with phenylaminomethyl triethoxysilane, and magnetically stirring at 75-85 ℃ for 20-40 min to obtain the modified ceramic particles.
4. The silicon nitride-bonded silicon carbide refractory according to claim 3, wherein the ceramic particles have a volume ratio of kaolin, clay, feldspar and quartz of 0.8 to 1: 0.5: 2.2: 1.2 to 1.6.
5. The silicon nitride-bonded silicon carbide refractory according to claim 3, wherein the mass ratio of the ceramic particles to the phenylaminomethyltriethoxysilane is 1: 0.6 to 0.8.
6. The silicon nitride-bonded silicon carbide refractory according to claim 1, wherein the content of sodium oxide in the glass fiber is 8.5% to 9.5%.
7. A method for producing the silicon nitride-bonded silicon carbide refractory according to any one of claims 1 to 6, characterized by comprising the steps of:
step one, respectively crushing the silicon nitride and the silicon carbide in parts by weight to 60-100 meshes, then respectively grinding for 3-6 hours, then mixing and adding the magnesia in parts by weight, and mixing and grinding for 2-4 hours to obtain a composition A for later use;
secondly, crushing the glass fiber, the attapulgite and the talcum powder in parts by weight to 100-120 meshes, mixing, and calcining at 720-780 ℃ for 1.5-2.5 hours to obtain a composition B for later use;
and step three, adding the composition B in the step two into the composition A in the step one, stirring and mixing at the speed of 350 r/min-650 r/min for 15 min-25 min, then adding the modified ceramic particles, graphene and aluminum silicate in parts by weight, continuously stirring for 25 min-30 min, then injecting the mixture into a mold for molding to obtain a refractory plate blank, and baking the blank until the moisture content is 4.5% -6.5%, thus obtaining the silicon nitride-silicon carbide combined refractory material.
8. The method of claim 7, wherein in step two, the calcination is carried out at a temperature of 420 ℃ to 500 ℃ for 0.5 hour to 1.0 hour.
9. The method of claim 7, wherein in step three, the mold forming temperature is 65 ℃ to 85 ℃.
10. The method of claim 7, wherein in step three, the firing process is: firstly, firing for 1.0 to 1.5 hours at the temperature of 760 to 880 ℃, then raising the temperature to 1370 to 1520 ℃ at a constant speed, continuing to calcine for 4.5 to 6.5 hours, and finally cooling along with the furnace.
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