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Preparation method of high-strength silicon carbide porous ceramic

A technology of porous ceramics and silicon carbide, applied in the field of silicon carbide carrier material preparation, can solve the problems of reduced mechanical strength of porous ceramics or honeycomb ceramics, low porosity, limited application of porous ceramics or honeycomb ceramics, etc. The effect of high strength and simple production process

Active Publication Date: 2013-08-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patents have made good progress in porous ceramics or honeycomb ceramics and their applications. However, most porous ceramics use organic matter to form pores or in-situ reactions to form pores or foam to form pores. A large amount of organic substances are added to honeycomb ceramics. The effect is ideal, but it will directly lead to the reduction of the mechanical strength of porous ceramics or honeycomb ceramics. Most of the mechanical strength is about 20MPa. Although some porous ceramics can reach 50MPa, the apparent porosity is obviously very low (only about 20%). These Both greatly limit the application of porous ceramics or honeycomb ceramics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1. A method for preparing high-strength silicon carbide porous ceramics, with a weight percentage of 49.5% α-silicon carbide powder, 49.4% β-silicon carbide powder, 0.1% aluminum diboride and 1.0% poly Carbosilane constitutes the raw material, and the following steps are carried out in sequence:

[0022] 1) Add the above raw materials to an organic dispersion solvent composed of ethanol, xylene, and n-hexane in a volume ratio of 1:4:5, ball-milled and mixed for 24 hours, and dried at 40°C for 24 hours to obtain a silicon carbide composite powder; The material-liquid ratio of the raw material to the organic dispersion solvent is 1g / 3ml;

[0023] 2) Dry-press forming the silicon carbide composite powder at 50MPa to obtain a silicon carbide green body;

[0024] 3) Put the above-mentioned silicon carbide body into a vacuum pressureless sintering furnace, firstly heat up to 1500°C for vacuum degassing for 4 hours, then heat up to 2200°C and sinter under argon protection fo...

Embodiment 2

[0026] Example 2. A method for preparing high-strength silicon carbide porous ceramics, with a weight percentage of 88.65% α-silicon carbide powder, 9.85% β-silicon carbide powder, 0.5% aluminum diboride and 1.0% poly Carbosilane constitutes the raw material, and the following steps are carried out in sequence:

[0027] 1) Add the above raw materials to an organic dispersion solvent composed of ethanol, xylene, and n-hexane in a volume ratio of 1:3:6, ball-milled and mixed for 24 hours, and dried at 40°C for 24 hours to obtain a silicon carbide composite powder; The material-to-liquid ratio of the raw material to the organic dispersion solvent is 1g / 5ml;

[0028] 2) Dry-press forming the silicon carbide composite powder at 50MPa to obtain a silicon carbide green body;

[0029] 3) Put the above-mentioned silicon carbide body in a vacuum pressureless sintering furnace, firstly heat up to 1500°C for vacuum degassing for 3 hours, then heat up to 2200°C and sinter under argon protection ...

Embodiment 3

[0031] Example 3. A method for preparing high-strength silicon carbide porous ceramics, consisting of 68.95% α-silicon carbide powder, 29.55% β-silicon carbide powder, 1.0% aluminum diboride and 0.5% by weight percentage Polycarbosilane constitutes the raw material, and the following steps are carried out in sequence:

[0032] 1) Add the above raw materials to an organic dispersion solvent composed of ethanol, xylene, and n-hexane in a volume ratio of 1:3.5:5.5, ball-milled and mixed for 24 hours, and dried at 40°C for 24 hours to obtain a silicon carbide composite powder; The material-to-liquid ratio of the raw material to the organic dispersion solvent is 1g / 5ml;

[0033] 2) Dry-press forming the silicon carbide composite powder at 50MPa to obtain a silicon carbide green body;

[0034] 3) Put the above-mentioned silicon carbide body in a vacuum pressureless sintering furnace, firstly heat up to 1500°C for vacuum degassing for 5 hours, then heat up to 2200°C and sinter under argon ...

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Abstract

The invention discloses a preparation method of a high-strength silicon carbide porous ceramic. Raw materials are composed of 98%-99% of mixture of alpha-silicon carbide powder and beta-silicon carbide powder, 0.1%-1.0% of aluminum diboride and 0.5%-1% of polycarbosilane, by weight percent. The method comprises the following steps: 1) adding the raw materials into an organic dispersing solvent, ball-milling, mixing and drying; 2) dry-pressing and forming the obtained silicon carbide compound powder under the 45-55 MPa; and 3) placing a silicon carbide blank into a vacuum pressure-less sintering furnace, for sintering at two steps, thereby obtaining the high-strength silicon carbide porous ceramic. The preparation method is simple and the prepared silicon carbide porous ceramic is characterized by high mechanical strength, suitable porosity, and the like.

Description

Technical field [0001] The present invention relates to a high-strength silicon carbide porous ceramic and a preparation method thereof, and specifically, to a preparation method of a silicon carbide carrier material for automobile exhaust purification, high-temperature filtration, heat exchange and the like. Background technique [0002] Silicon carbide porous ceramic is a new type of silicon carbide functional material with a certain porosity, which is made by artificially controllable pores in the silicon carbide ceramic matrix. It not only has the high strength, corrosion resistance, oxidation resistance and heat resistance of silicon carbide itself. Vibration and high temperature resistance and other physical and chemical properties, but also have the characteristics of low density, high strength, high porosity, high permeability, large specific surface area, good heat insulation, etc., can be used as high-temperature gas purifiers, diesel engine exhaust Solid particle filte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 郭兴忠杨辉朱林张玲洁郑志荣高黎华
Owner ZHEJIANG UNIV
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