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A kind of alumina fiber reinforced silicon carbide-aluminosilicate ceramic and preparation method thereof

A technology of alumina fiber and aluminum silicate ceramics, which is applied in the field of fiber-reinforced ceramic materials, can solve the problem of unsatisfactory oxidation resistance of composite materials, and achieve excellent oxidation resistance and environmental resistance, high specific strength and specific modulus , Excellent thermal shock resistance

Active Publication Date: 2017-03-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of more pores and cracks in the matrix, the oxidation resistance of the composite is not ideal

Method used

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  • A kind of alumina fiber reinforced silicon carbide-aluminosilicate ceramic and preparation method thereof
  • A kind of alumina fiber reinforced silicon carbide-aluminosilicate ceramic and preparation method thereof
  • A kind of alumina fiber reinforced silicon carbide-aluminosilicate ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] a kind of like figure 1The alumina fiber reinforced silicon carbide-aluminosilicate ceramics of the present invention (abbreviated as Al 2 o 3f / SiC-AS), containing about 41% volume fraction of alumina fibers, about 33% volume fraction of SiC ceramics and about 12% volume fraction of AS ceramics.

[0033] A kind of preparation above-mentioned present embodiment Al 2 o 3f The method of SiC-AS ceramics specifically comprises the following steps:

[0034] (1)Al 2 o 3f Preparation of SiC ceramic green body: using three-dimensional orthogonal alumina fiber fabric as reinforcement, trichloromethylsilane-hydrogen-argon as raw material, using CVI to prepare Al 2 o 3f / SiC ceramic body; CVI process parameters are: deposition temperature 1100°C, deposition pressure 1.5kPa, hydrogen and argon gas flow ratio 1.5:1, deposition time 10h;

[0035] (2)Al 2 o 3f Processing of / SiC ceramic green body: to the Al that above-mentioned step (1) makes 2 o 3f / SiC ceramic body is pr...

Embodiment 2

[0045] A kind of alumina fiber reinforced silicon carbide-aluminosilicate ceramics of the present invention (abbreviated as Al 2 o 3f / SiC-AS), containing about 43% volume fraction of alumina fibers, about 25% volume fraction of SiC ceramics and about 18% volume fraction of AS ceramics.

[0046] A kind of preparation above-mentioned present embodiment Al 2 o 3f The method of SiC-AS ceramics specifically comprises the following steps:

[0047] (1)Al 2 o 3f Preparation of SiC ceramic green body: using three-dimensional orthogonal alumina fiber fabric as reinforcement, trichloromethylsilane-hydrogen-argon as raw material, using CVI to prepare Al 2 o 3f / SiC ceramic body; CVI process parameters are: deposition temperature 1050°C, deposition pressure 2kPa, hydrogen and argon flow ratio 2:1, deposition time 8h;

[0048] (2)Al 2 o 3f Processing of / SiC ceramic green body: to the Al that above-mentioned step (1) makes 2 o 3f / SiC ceramic body is processed on the surface to c...

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Abstract

The invention discloses alumina fiber-reinforced silicon carbide-aluminum silicate ceramic. An alumina fiber fabric serves as a reinforcement body, silicon carbide ceramic and aluminum silicate ceramic serve as a base body, the silicon carbide ceramic is mainly molded by using a chemical gas-phase permeation method, and the aluminum silicate ceramic is introduced through a sol-gel process. A preparation method comprises the following steps: preparing an Al2O3f / SiC ceramic blank from raw materials including the alumina fiber fabric, trichloromethyl silane, hydrogen and argon by using the chemical gas-phase permeation method; machining the surface of the prepared ceramic blank, and changing a great number of closed holes in the surface into open holes; performing vacuum impregnation on the ceramic blank by using silicon-aluminum composite sol, and transforming the ceramic blank into an intermediate product through gelation and high-temperature ceramization; repeatedly executing the steps for at least four times to obtain the alumina fiber-reinforced silicon carbide-aluminum silicate ceramic finally. The mechanical property, the high temperature resistance and the oxidation resistance of the alumina fiber-reinforced silicon carbide-aluminum silicate ceramic are excellent, the preparation period is short, the cost is low, and clear dimension molding can be achieved.

Description

technical field [0001] The invention relates to the field of fiber-reinforced ceramic materials, in particular to a fiber-reinforced silicon carbide-aluminum silicate ceramic and a preparation method thereof. Background technique [0002] Oxide fiber reinforced silicon carbide ceramics have excellent mechanical properties, dielectric properties, oxidation resistance and environmental resistance, and are an important class of high-temperature structural functional materials. However, silicon carbide has poor high-temperature environmental resistance, such as easy oxidation and failure in a high-temperature aerobic water vapor environment, which greatly limits its application. [0003] At present, the preparation techniques of oxide fiber reinforced silicon carbide ceramics mainly include precursor transformation method (PIP) and chemical vapor infiltration method (CVI). The PIP method has low sintering temperature, strong designability of the matrix, and near-net size moldin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/16C04B35/622
Inventor 王义程海峰刘海韬王军
Owner NAT UNIV OF DEFENSE TECH