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Surface microporous SiC ceramic material and preparation method thereof

A ceramic material and surface microporous technology, applied in the field of surface microporous SiC ceramic material and its preparation, can solve the problems of shortened service life, increased friction coefficient, uneven distribution, etc. Effect

Active Publication Date: 2011-04-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hardness of silicon carbide ceramics has been improved, some silicon carbide ceramic mechanical parts (such as silicon carbide seals) still have the following problems during use: 1), some silicon carbide ceramic mechanical parts (such as silicon carbide seals) When hard-to-hard seals are rubbed, the working surfaces at both ends are easily bonded, which increases the friction coefficient and shortens the service life
2) The debris generated during friction cannot be removed in time, which will accelerate the wear of mechanical parts, thus affecting the service life of seals
The above method has the following disadvantages: the cross-linked pores formed by the decomposition of the cross-linking agent at high temperature have different sizes, irregular shapes, and uneven distribution, and the product is prone to cracking during the sintering process, which affects the yield of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. A method for preparing a surface microporous SiC ceramic material, followed by the following steps:

[0027] 1) Ingredients:

[0028] The main raw material is composed of 85 parts of silicon carbide powder and 15 parts of yttrium aluminum garnet, 10 parts of polycarbosilane as binder and foaming agent, and 8 parts of carboxymethyl cellulose as pore former.

[0029] 2) Mix the above-mentioned silicon carbide powder, yttrium aluminum garnet and polycarbosilane uniformly, and mix them into a mixture;

[0030] 3). Add carboxymethyl cellulose to deionized water and stir until it is completely melted to obtain a methyl cellulose aqueous solution with a mass concentration of 7% (that is, the mass concentration of carboxymethyl cellulose in the methyl cellulose aqueous solution is 7%);

[0031] 4) After ball milling the mixture with the carboxymethyl cellulose aqueous solution for 5 hours, a slurry is obtained;

[0032] 5). Dry the slurry at a temperature of 150°C for 3 hours,...

Embodiment 2

[0036] Embodiment 2. A method for preparing a surface microporous SiC ceramic material, followed by the following steps:

[0037] 1) Ingredients:

[0038] The main raw material is composed of 90 parts of silicon carbide powder and 10 parts of yttrium aluminum garnet, 5 parts of polycarbosilane as binder and foaming agent, and 2 parts of carboxymethyl cellulose as pore former.

[0039] 2) Mix the above-mentioned silicon carbide powder, yttrium aluminum garnet and polycarbosilane uniformly, and mix them into a mixture;

[0040] 3) Add carboxymethyl cellulose to deionized water and stir until it is completely dissolved to obtain a methyl cellulose aqueous solution with a mass concentration of 3%;

[0041] 4) After ball milling the mixture and the carboxymethyl cellulose aqueous solution for 7 hours, a slurry is obtained;

[0042] 5) Dry the slurry at a temperature of 120°C for 4 hours, then use a mixer to fully stir and mix again; obtain powder;

[0043] 6) Put the above powder in a mold usi...

Embodiment 3

[0046] Embodiment 3. A method for preparing a surface microporous SiC ceramic material, followed by the following steps:

[0047] 1) Ingredients:

[0048] The main raw material is composed of 88 parts of silicon carbide powder and 12 parts of yttrium aluminum garnet, 7 parts of polycarbosilane as binder and foaming agent, and 5 parts of carboxymethyl cellulose as pore former.

[0049] 2) Mix the above-mentioned silicon carbide powder, yttrium aluminum garnet and polycarbosilane uniformly, and mix them into a mixture;

[0050] 3) Add carboxymethyl cellulose to deionized water, stir until it is completely dissolved, to obtain a methyl cellulose aqueous solution with a mass concentration of 5%;

[0051] 4) After ball milling the mixture with the carboxymethyl cellulose aqueous solution for 2 hours, a slurry is obtained;

[0052] 5) Dry the slurry at a temperature of 100°C for 4 hours, then use a mixer to fully stir and mix again; obtain powder;

[0053] 6) Put the above powder in a mold usin...

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Abstract

The invention discloses a surface microporous SiC ceramic material, which consists of main raw materials, polycarbosilane and carboxymethyl cellulose, wherein the main raw materials consist of the following components in percentage by weight: 85 to 90 percent of silicon carbide powder and 10 to 15 percent of yttrium aluminum garnet; the polycarbosilane is 5 to 10 percent of the total weight of the main raw materials; and the carboxymethyl cellulose is 2 to 8 percent of the total weight of the main raw materials. Meanwhile, the invention discloses a method for preparing the surface microporous SiC ceramic material, which comprises the following steps of: uniformly mixing the silicon carbide powder, the yttrium aluminum garnet and the polycarbosilane, and adding aqueous solution of the carboxymethyl cellulose and performing ball-milling mixing; drying the obtained size; and molding the obtained powder and performing vacuum sintering at high temperature so as to prepare the surface microporous SiC ceramic material. The surface microporous SiC ceramic material keeps high strength, high hardness, abrasion resistance, corrosion resistance and oxidation resistance, the self-lubricating property of the material is improved, and a cross section can be prevented from being bonded. Therefore, the service life of the material is prolonged.

Description

Technical field [0001] The invention relates to a surface microporous SiC ceramic material and a preparation method thereof. Background technique [0002] Ceramic materials are widely used in the fields of national defense, machinery, chemical industry, metallurgy, and electronics. In recent years, developed countries such as Britain, the United States, Germany, France, and Japan have widely applied structural ceramics to structural parts of aviation, aerospace and high-precision machinery, and have achieved considerable economic and social benefits. Among many engineering ceramic materials, silicon carbide (SiC) ceramics have high strength, high hardness, good wear resistance, corrosion resistance, strong oxidation resistance, high thermal conductivity, good high temperature stability, low thermal expansion coefficient, and heat resistance It has excellent properties such as vibration resistance and strong chemical corrosion resistance, and has become the most promising high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B38/02C04B35/622
Inventor 郭兴忠杨辉黄永银郑志荣高黎华
Owner ZHEJIANG UNIV
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