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Method for preparing Al4SiC4 ceramics

A technology for ceramics and preparation steps, applied in the field of preparation of Al4SiC4 ceramics, can solve the problems of high production cost and cumbersome preparation process, and achieve the effects of good room temperature and high temperature mechanical properties, fast dissolution, and excellent high temperature stability.

Inactive Publication Date: 2005-01-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods must first synthesize Al 4 SiC 4 The powder is then sintered, which has the disadvantages of cumbersome preparation process and high production cost

Method used

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Examples

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specific Embodiment approach 1

[0006] Specific embodiment one: a kind of Al 4 SiC 4 The preparation method of pottery, its each component weight ratio is aluminum powder: graphite powder: polycarbosilane=(2~4): (0.2~3.8): (1~5), preparation step is: (one) at first Fully mix aluminum powder and graphite powder; at the same time, dissolve polycarbosilane in an organic solvent to form a clear and transparent solution, then place the mixed aluminum and graphite powder in the organic solution of polycarbosilane, stir for at least 10 minutes, and place Heat the solution and continue to stir to volatilize the organic solvent until the solution becomes a thick paste, stop stirring, but continue to heat and dry to volatilize the organic solvent completely. (2) Take out the dried powder and crack it at 800-1400°C under the protection of argon. The purpose of cracking is to completely inorganicize the organic polycarbosilane and transform it into amorphous or microcrystalline SiC particles. (3) The cracked powder is...

specific Embodiment approach 2

[0007] Specific embodiment two: the difference between this embodiment and embodiment one is that its weight ratio of each component is: aluminum powder: graphite powder: polycarbosilane=(2~4): (0.2~3.8): (1 ~2). The preparation steps are the same as the first embodiment.

specific Embodiment approach 3

[0008] Specific embodiment three: the difference between this embodiment and embodiment one is that its weight ratio of each component is: aluminum powder: graphite powder: polycarbosilane=(2~4): (0.2~3.8): (2.1 ~5). The preparation steps are the same as the first embodiment.

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Abstract

The weight ratio of each compound aluminium powder: graphite powder: polycarbonsilane is (2-4):(0.2-3.8):(1-5). The. prepn. steps are: (1) aluminium powder and graphite powder are fully mixed, polycabonsilane is dissolved in organic solution, then putting mixed aluminium and graphite powder into organic solution of polycarbonsilane, increasing temp. and stirring until that organic solution volatilizing completely; (2) dried powder is splited in temp. 800-1400 deg.C protected by argon, (3) splited powder material is fully grinded and mixed; (4) mixed material is put in model made of graphite to be fired in temp. 1600-2200 deg.C in heat pressing fire surface, argon gas is blew in for protection, firing pressure is 10-40 MPa, temp.-keeping 1-5 hours.

Description

Technical field: [0001] The present invention relates to an Al 4 SiC 4 Methods of preparation of ceramics. Background technique: [0002] al 4 SiC 4 Ternary bulk ceramics have high melting point, low density, excellent mechanical properties at room temperature and high temperature, excellent oxidation resistance and corrosion resistance, and have good electrical and thermal conductivity, low thermal expansion coefficient, etc., so they have a wide range of applications. Application prospect. Japanese Will Al 4 SiC 4 The powder is added to the oxide refractory carbon brick to enhance its anti-oxidation performance. When its weight percentage is only 5%, with no Al added 4 SiC 4 Compared with powdered oxide refractory carbon bricks, its oxidation resistance has been significantly improved. Al 4 SiC 4 Several studies have been performed on the synthesis of ternary bulk ceramics. Koji Inoue et al. used two routes to prepare Al 4 SiC 4 ceramics. One is to obtain p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/64
Inventor 温广武黄小萧宋亮
Owner HARBIN INST OF TECH
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