CN112028645A - High-performance sialon corundum composite silicon carbide castable and preparation method thereof - Google Patents
High-performance sialon corundum composite silicon carbide castable and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance sialon corundum composite silicon carbide castable which is prepared from the following raw materials in parts by weight: 45-50 parts of aggregate and industrial Si3N425-45 parts of-SiC powder and 2-15 parts of matrix powder bonding agent. The preparation method of the high-performance sialon corundum composite silicon carbide castable comprises the following steps: (1) preparing raw materials; (2) crushing and grinding raw materials; (3) primary mixing; (4) preheating; (5) sintering; (6) cooling; (7) mixing materials in a second stage; (8) and (5) grinding the finished product. The sialon corundum composite silicon carbide castable in the application has the characteristics of low energy consumption, environmental protection, energy conservation, high strength, good wear resistance, good erosion resistance, good thermal shock resistance, creep reduction, high thermal shock resistance and the like compared with the production process.
Description
Technical Field
The invention relates to the technical field of refractory castable, in particular to a high-performance sialon corundum composite silicon carbide castable and a preparation method thereof.
Background
Along with the development of society, the industry develops more and more rapidly, various buildings and road measures are continuously perfected, in the application process, no matter the buildings are roads or houses, the development of the buildings and the buildings can not be separated from steel, cement and even glass ceramics, no matter the buildings are steel, cement, glass or ceramics, the production of the buildings and the buildings can relate to the application of a kiln, and in the calcining process of the kiln, in order to facilitate heat preservation and reduce heat loss, a layer of castable is additionally arranged on the inner wall of the kiln. However, the traditional castable has the defects of high production energy consumption, large pollution, and insufficient strength, wear resistance, corrosion resistance, thermal shock resistance, high temperature resistance, creep deformation and thermal shock resistance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-performance sialon corundum composite silicon carbide castable and a preparation method thereof.
In order to solve the technical problem, the scheme of the invention is as follows:
a high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: 45-50 parts of aggregate and industrial Si3N425-45 parts of-SiC powder and 2-15 parts of matrix powder bonding agent, wherein the aggregate comprises 45-50 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is composed of the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
The composite material consists of the following raw materials in parts by weight: 46-48 parts of aggregate and industrial Si3N430-40 parts of-SiC powder and 7-10 parts of matrix powder bonding agent.
The composite material consists of the following raw materials in parts by weight: 47 parts of aggregate and industrial Si3N435 parts of SiC powder and 8 parts of matrix powder bonding agent.
A preparation method of a high-performance sialon corundum composite silicon carbide castable comprises the following steps:
(1) preparing raw materials: enough aggregate and industrial Si are prepared3N4-SiC waste and matrix powder binder;
(2) crushing and grinding raw materials: prepared aggregate and industrial Si3N4Respectively crushing and grinding the-SiC waste to obtain aggregate powder and Si3N4-SiC powder;
(3) primary mixing: taking out the ground aggregate powder and Si according to a proper proportion3N4Evenly stirring SiC powder through mixing equipment to obtain primary mixed material;
(4) preheating: introducing the obtained primary mixed material into preheating equipment for preheating to obtain a preheated material;
(5) and (3) sintering: after the preheated material is discharged, the material is immediately led into high-temperature heating equipment to sinter the preheated material so as to ensure that Si is contained3N4the-SiC and the aluminum-rich synthetic spinel in the aggregate are mutually solid-dissolved to form sialon, and a sintered material is obtained;
(6) and (3) cooling: after the sintered material is led out, quickly performing air cooling until the temperature is reduced to be lower than the cooling temperature to obtain a cooled material;
(7) and (3) secondary material mixing: adding a proper amount of matrix powder bonding agent into the obtained cooling material, and introducing the cooling material into mixing equipment for mixing again to obtain a secondary mixed material;
(8) grinding of finished products: and (4) introducing the obtained secondary mixture into crushing equipment for grinding finished products to obtain finished products.
The preheating temperature of the preheating in the step (4) is 200-450 ℃.
The sintering temperature of the sintering in the step (5) is 1300-1600 ℃.
The cooling temperature in the step (6) is 60 ℃.
Compared with the prior art, the invention has the beneficial effects that:
in the present application, by Si3N4SiC and aluminum-rich synthetic spinel in the aggregate are mutually solid-dissolved to form Sialon (Sialon), so that the castable has high hardness, high melting point (2054 ℃) and high boiling point (2980 ℃) in alumina, and has the stability, higher thermal conductivity, smaller thermal expansion coefficient and good wear resistance of silicon carbide; meanwhile, the formed Sialon (Sialon) also has the physical properties of good mechanical strength, hardness and the like, and has strong wear resistance and good thermal stability. Therefore, it is not only easy to useThe sialon corundum composite silicon carbide castable has the advantages of being low in energy consumption, environment-friendly, energy-saving, high in strength, good in wear resistance, good in erosion resistance, good in thermal shock resistance, creep reduction, high in thermal shock resistance and the like.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: 45 parts of aggregate and industrial Si3N445 parts of SiC powder and 15 parts of matrix powder bonding agent, wherein the aggregate comprises 50 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is composed of the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
Example 2
A high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: aggregate 50 parts, industrial Si3N425 parts of SiC powder and 2 parts of matrix powder binder, wherein the aggregate comprises 45 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is prepared from the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
Example 3
A high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: 46 parts of aggregate and industrial Si3N440 parts of SiC powder and 10 parts of matrix powder bonding agent, wherein the aggregate comprises 46 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is composed of the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
Example 4
A high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: 48 parts of aggregate and industrial Si3N430 parts of SiC powder and 7 parts of matrix powder bonding agent, wherein the aggregate comprises 48 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is prepared from the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
Example 5
A high-performance sialon corundum composite silicon carbide castable is composed of the following raw materials in parts by weight: 47 parts of aggregate and industrial Si3N435 parts of SiC powder and 8 parts of matrix powder bonding agent, wherein the aggregate comprises 47 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is prepared from the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
In the above examples, Si is used3N4SiC and aluminum-rich synthetic spinel in the aggregate are mutually solid-dissolved to form Sialon (Sialon), so that the castable has high hardness, high melting point (2054 ℃) and high boiling point (2980 ℃) in alumina, and has the stability, higher thermal conductivity, smaller thermal expansion coefficient and good wear resistance of silicon carbide; meanwhile, the formed Sialon (Sialon) also has the physical properties of good mechanical strength, hardness and the like, and has strong wear resistance and good thermal stability. Therefore, the sialon corundum composite silicon carbide castable disclosed by the application is low in production energy consumption, environment-friendly and energy-saving, and has the characteristics of high strength, good wear resistance, good erosion resistance, good thermal shock resistance, creep reduction, high thermal shock resistance and the like.
A preparation method of a high-performance sialon corundum composite silicon carbide castable comprises the following steps:
(1) preparing raw materials: enough aggregate and industrial Si are prepared3N4-SiC waste and matrix powder binder;
(2) crushing and grinding raw materials: prepared aggregate and industrial Si3N4Respectively crushing and grinding the-SiC waste to obtain aggregate powder and Si3N4-SiC powder;
(3) primary mixing: taking out the ground aggregate powder and Si according to a proper proportion3N4Evenly stirring SiC powder through mixing equipment to obtain primary mixed material;
(4) preheating: introducing the obtained primary mixed material into preheating equipment for preheating to obtain a preheated material;
(5) and (3) sintering: after the preheated material is discharged, the material is immediately led into high-temperature heating equipment to sinter the preheated material so as to ensure that Si is contained3N4the-SiC and the aluminum-rich synthetic spinel in the aggregate are mutually solid-dissolved to form Sialon (Sialon) to obtain a sintering material;
(6) and (3) cooling: after the sintered material is led out, quickly performing air cooling until the temperature is reduced to be lower than the cooling temperature to obtain a cooled material;
(7) and (3) secondary material mixing: adding a proper amount of matrix powder bonding agent into the obtained cooling material, and introducing the cooling material into mixing equipment for mixing again to obtain a secondary mixed material;
(8) grinding of finished products: and (4) introducing the obtained secondary mixture into crushing equipment for grinding finished products to obtain finished products.
The preheating temperature of the preheating in the step (4) is 200-450 ℃. The preheating temperature of 200 and 450 can preheat materials, so that the energy loss during sintering is reduced, and the energy is saved.
The sintering temperature of the sintering in the step (5) is 1300-1600 ℃. The materials can be smoothly sintered at 1300 ℃ and 1600 ℃.
The cooling temperature in the step (6) is 60 ℃. The 60 ℃ can avoid the damage to articles or people.
In the application, the aggregate can be obtained by crushing one or more of coal slag, ceramsite and expanded perlite.
After the materials are ground into finished products, a proper amount of scrap iron is added into the obtained finished products, which is helpful for improving the wear resistance of the finished products.
Aluminum oxide (alumina oxide), also known as corundum, alumina and alumina, is a high hardness compound with a high melting point (2054 ℃) and a boiling point of 2980 ℃, and is a relatively stable oxide.
The silicon carbide is also called carborundum, and has stable chemical properties, high heat conductivity coefficient, small thermal expansion coefficient and good wear resistance.
The detection data of the castable prepared by adopting the preparation method disclosed by the invention are as follows:
the embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. A high-performance sialon corundum composite silicon carbide castable is characterized in that: the composite material consists of the following raw materials in parts by weight: 45-50 parts of aggregate and industrial Si3N425-45 parts of-SiC powder and 2-15 parts of matrix powder bonding agent, wherein the aggregate comprises 45-50 parts of aluminum-rich synthetic spinel, and the aluminum-rich synthetic spinel is composed of the following raw materials in parts by weight: 25-35 parts of 10-25mm large particles, 8-12 parts of 5-10 mm particles, 6-8 parts of 3-5mm particles, 3-5 parts of 1-3mm particles and 2-5 parts of 0.1-1mm fine particles; si3N425-45 parts of-SiC powder, wherein Si3N40-44 mu m of powder, 5-15 parts of SiC powder: 0-44 μm, 15-30 parts, matrix powder binder: active Al2O3Ultra-fine powder: 0-4 μm, 1-3 parts, carbon powder: 1-8 parts of Al (OH)3Sol suspension, dry matter: 2-8 parts of diluent and 1-6 parts of diluent.
2. The high performance sialon corundum composite silicon carbide castable material according to claim 1, characterized in that: the composite material consists of the following raw materials in parts by weight: 46-48 parts of aggregate and industrial Si3N430-40 parts of-SiC powder and matrix powder7-10 parts of a binding agent.
3. The high performance sialon corundum composite silicon carbide castable material according to claim 1, characterized in that: the composite material consists of the following raw materials in parts by weight: 47 parts of aggregate and industrial Si3N435 parts of SiC powder and 8 parts of matrix powder bonding agent.
4. A method for preparing a high performance sialon corundum composite silicon carbide castable material according to any one of claims 1-3, characterized in that: the method comprises the following steps:
(1) preparing raw materials: enough aggregate and industrial Si are prepared3N4-SiC waste and matrix powder binder;
(2) crushing and grinding raw materials: prepared aggregate and industrial Si3N4Respectively crushing and grinding the-SiC waste to obtain aggregate powder and Si3N4-SiC powder;
(3) primary mixing: taking out the ground aggregate powder and Si according to a proper proportion3N4Evenly stirring SiC powder through mixing equipment to obtain primary mixed material;
(4) preheating: introducing the obtained primary mixed material into preheating equipment for preheating to obtain a preheated material;
(5) and (3) sintering: after the preheated material is discharged, the material is immediately led into high-temperature heating equipment to sinter the preheated material so as to ensure that Si is contained3N4the-SiC and the aluminum-rich synthetic spinel in the aggregate are mutually solid-dissolved to form sialon, and a sintered material is obtained;
(6) and (3) cooling: after the sintered material is led out, quickly performing air cooling until the temperature is reduced to be lower than the cooling temperature to obtain a cooled material;
(7) and (3) secondary material mixing: adding a proper amount of matrix powder bonding agent into the obtained cooling material, and introducing the cooling material into mixing equipment for mixing again to obtain a secondary mixed material;
(8) grinding of finished products: and (4) introducing the obtained secondary mixture into crushing equipment for grinding finished products to obtain finished products.
5. The preparation method of the high-performance sialon corundum composite silicon carbide castable according to claim 4, characterized in that: the preheating temperature of the preheating in the step (4) is 200-450 ℃.
6. The preparation method of the high-performance sialon corundum composite silicon carbide castable according to claim 4, characterized in that: the sintering temperature of the sintering in the step (5) is 1300-1600 ℃.
7. The preparation method of the high-performance sialon corundum composite silicon carbide castable according to claim 4, characterized in that: the cooling temperature in the step (6) is 60 ℃.
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| CN113666757A (en) * | 2021-08-27 | 2021-11-19 | 宜兴市兴贝耐火保温工程有限公司 | High-strength refractory castable for CFB boiler ignition part and preparation method thereof |
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