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Low-friction-factor silicon carbide ceramic sealing element and preparation method thereof

A technology of silicon carbide ceramics and low friction coefficient, which is applied in the field of silicon carbide ceramic seals and its preparation, can solve the problems of lubricating performance and mechanical properties that need to be improved, and achieve the effect of low friction coefficient and guaranteed mechanical properties

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

In the patent whose publication number is CN101551012A, it is informed that 82-90% silicon carbide powder, 2-8% carbon powder and 8-10% yttrium aluminum garnet are used as raw materials; but it also has lubricating properties and mechanical properties. Defects where performance could be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, a kind of preparation method of the silicon carbide ceramic seal of low coefficient of friction, carry out following steps successively:

[0023] 1), 65 parts of silicon carbide, 5 parts of boron nitride, 10 parts of fluorinated graphite, 10 parts of MoS 2 Mix with 10 parts of yttrium aluminum garnet to form the main raw material; then add 3 parts of polyvinyl alcohol, 2 parts of tetramethylammonium hydroxide and 105 parts of deionized water, and perform mechanical ball milling for 3 hours; slurry;

[0024] 2), the slurry is sprayed and granulated, and the process conditions are as follows: the flow rate of the slurry is 2.5kg / h, and the temperature of the hot air inlet is 220°C; the powdered granules are obtained;

[0025] 3), the powdered granules are placed in a mold for one-time dry pressing molding, and the molding pressure is 150MPa to obtain a green body;

[0026] 4) Sintering the above green body in a pressureless liquid phase at a temperature of...

Embodiment 2

[0028] Embodiment 2, a kind of preparation method of the silicon carbide ceramic seal of low coefficient of friction, carry out following steps successively:

[0029] 1), 75 parts of silicon carbide, 5 parts of boron nitride, 5 parts of graphite fluoride, 5 parts of MoS 2 Mix with 10 parts of yttrium aluminum garnet to form the main raw material; then add 3 parts of polyvinyl alcohol, 2 parts of tetramethylammonium hydroxide and 155 parts of deionized water, and perform mechanical ball milling for 4 hours; slurry;

[0030] 2), the slurry is sprayed and granulated, and the process conditions are as follows: the flow rate of the slurry is 3kg / h, and the hot air inlet temperature is 250°C; powdered granules are obtained;

[0031] 3), the powdered granules are placed in the mold for one-time dry pressing molding, the molding pressure is 120MPa, and the green body is obtained;

[0032] 4) Sintering the above-mentioned green body in a pressureless liquid phase at a temperature of ...

Embodiment 3

[0034] Embodiment 3, a method for preparing a silicon carbide ceramic seal with a low coefficient of friction, the following steps are carried out in sequence:

[0035] 1), 70 parts of silicon carbide, 10 parts of boron nitride, 5 parts of fluorinated graphite, 5 parts of MoS 2 Mix with 10 parts of yttrium aluminum garnet to form the main raw material; then add 3 parts of polyvinyl alcohol, 2 parts of tetramethylammonium hydroxide and 70 parts of deionized water, and perform mechanical ball milling for 3 hours; slurry;

[0036] 2), the slurry is sprayed and granulated, and the process conditions are as follows: the flow rate of the slurry is 2.5kg / h, and the temperature of the hot air inlet is 200°C; powder granules are obtained;

[0037] 3), the powdered granules are placed in the mold for one-time dry pressing molding, the molding pressure is 130MPa, and the green body is obtained;

[0038] 4) Sintering the above-mentioned green body in a pressureless liquid phase at a tem...

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Abstract

The invention discloses a low-friction-factor silicon carbide ceramic sealing element which is prepared from a main raw material, polyvinyl alcohol and tetramethyl ammonium hydroxide, wherein the main raw material comprises 65-75% of silicon carbide, 5-10% of boron nitride, 5-10% of fluoridized graphite, 5-10% of molybdenum disulfide and 10% of yttrium aluminium garnet; the polyvinyl alcohol accounts for 2.5-3.5 wt% of the main raw material; and the tetramethyl ammonium hydroxide accounts for 1.5-2.5 wt% of the main raw material. The preparation method comprises the following steps: (1) carrying out ball milling to mix the main raw material, polyvinyl alcohol, tetramethyl ammonium hydroxide and deionized water; (2) carrying out spray granulation on the obtained slurry; (3) putting the obtained granules in a mold, and carrying out dry pressing for primary molding; and (4) carrying out pressureless liquid-phase sintering on the obtained blank to obtain the low-friction-factor silicon carbide ceramic sealing element. The sealing element has the advantages of low friction factor, favorable thermal properties and favorable mechanical properties.

Description

technical field [0001] The invention relates to a silicon carbide ceramic sealing part and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) ceramics is a typical covalently bonded ceramic material. In the SiC crystal structure, the C and Si bonds are long, the covalency is strong, and the lattice defects are small. This covalent bonding feature makes silicon carbide ceramics It has the characteristics of high-temperature strength, small high-temperature creep, high hardness, wear resistance, corrosion resistance, oxidation resistance, high thermal conductivity and high electrical conductivity, and good thermal stability; it has been widely used in high-tech fields such as machinery, chemical industry, energy, and military industry. A large number of applications. For example, used as high temperature, wear-resistant, corrosion-resistant mechanical seal components, various grinding wheels and molds. [0003] At present, silicon carbide ceram...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 杨辉郭兴忠张冬梅郑志荣高黎华
Owner ZHEJIANG UNIV
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