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Silicon nitride fiber reinforced silica and boron nitride ceramic matrix composite material and its preparation method and application

A technology for silicon nitride fibers and composite materials, applied in the field of ceramic matrix composite materials, can solve the problems of human toxicity, high price of boron nitride ceramic precursors, harsh molding and preparation conditions, etc., and achieves high viscosity at high temperature, which is conducive to densification. , the effect of reducing human toxicity

Active Publication Date: 2019-11-22
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material has a relative density of 91%, a bending strength of about 73.4 MPa at 1300°C, and a certain degree of ductile fracture, which can basically meet the needs of high-temperature and long-endurance aircraft, but the problem lies in boron nitride ceramics. Precursors are expensive and highly toxic to the human body, resulting in relatively harsh conditions for molding and preparation

Method used

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  • Silicon nitride fiber reinforced silica and boron nitride ceramic matrix composite material and its preparation method and application

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Effect test

Embodiment 1

[0029] A kind of Si of the present invention 3 N 4f / SiO 2 -BN composites, including Si 3 N 4 Two-dimensional semi-Si with a fiber volume fraction of 35% prepared by weaving and piercing fiber bundles 3 N 4 Fiber preforms, and uniformly filled in the two-dimensional semi-Si 3 N 4 SiO in the pores of fiber preforms 2 Ceramic substrate and BN ceramic substrate. Among them, SiO 2 ceramic matrix in the Si 3 N 4f / SiO 2 -The volume fraction in the BN composite material is 43%, and the BN ceramic matrix is ​​in the Si 3 N 4f / SiO 2 - The volume fraction in the BN composite is 17%.

[0030] A kind of Si of above-mentioned present embodiment 3 N 4f / SiO 2 -The preparation method of BN composite material, comprises the following steps:

[0031] (1) Preparation of fiber preform: Si 3 N 4 A two-dimensional silicon semi-nitride fiber preform with a fiber volume fraction of 35% is prepared by weaving and puncturing the fiber bundles.

[0032] (2) Debinding treatment: ...

Embodiment 2

[0038] A kind of Si of the present invention 3 N 4f / SiO 2 -BN composites, including Si 3 N 4 Three-dimensional Si with a fiber volume fraction of 33% prepared by weaving fiber bundles 3 N 4 Fiber preforms, and uniformly filled in the three-dimensional Si 3 N 4 SiO in the pores of fiber preforms 2 Ceramic substrate and BN ceramic substrate. Among them, SiO 2 ceramic matrix in the Si 3 N 4f / SiO 2 -The volume fraction in the BN composite material is 46%, and the BN ceramic matrix is ​​in this Si 3 N4f / SiO 2 - The volume fraction in the BN composite is 14%.

[0039] A kind of Si of above-mentioned present embodiment 3 N 4f / SiO 2 -The preparation method of BN composite material, comprises the following steps:

[0040] (1) Preparation of fiber preform: Si 3 N 4 A three-dimensional silicon nitride fiber preform with a fiber volume fraction of 33% was prepared by braiding the fiber bundles.

[0041] (2) Debinding treatment: place the three-dimensional silicon ...

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Abstract

The invention discloses a silicon nitride fiber-enhanced silicon dioxide and boron nitride ceramic matrix composite and a preparing method and application thereof. The silicon nitride fiber-enhanced silicon dioxide and boron nitride ceramic matrix composite is prepared from a Si3N4 fiber prefabricated member, a SiO2 ceramic matrix and a BN ceramic matrix, wherein gaps of the Si3N4 fiber prefabricated member are filled with the SiO2 ceramic matrix and the BN ceramic matrix. The preparing method comprises the steps that firstly, the Si3N4 fiber prefabricated member is subjected to super glue heat treatment; secondly, a Si3N4f / SiO2 composite midbody is prepared; thirdly, a Si3N4f / SiO2-BN composite midbody is prepared; fourthly, decarbonization treatment is carried out. The composite has the advantages of being high in density, good in temperature resistance and high in carrying capacity, having a high dielectric property and the like, and the composite has high application value in the high-temperature wave-transmitting material field; the preparing method is simple in process, relatively low in cost and suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a silicon nitride fiber-reinforced silicon dioxide and boron nitride ceramic matrix composite material and its preparation method and application. Background technique [0002] With the rapid development of high-speed aircraft, high-temperature wave-transparent materials for radome or antenna window are facing severe challenges, and the continuous improvement of their comprehensive performance is urgently required, including: long-term high-temperature bearing capacity, excellent room temperature and high-temperature dielectric properties (dielectric properties) Electrical constant ε<4, loss tangent tanS<0.01), excellent thermal shock resistance, good ablation resistance, low thermal conductivity and thermal expansion coefficient, and good environmental resistance, etc. [0003] Currently, quartz fiber reinforced silica (SiO 2f / SiO ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/14C04B35/622C04B35/638
CPCC04B35/14C04B35/622C04B35/638C04B35/806C04B2235/386C04B2235/3873C04B2235/602C04B2235/6562C04B2235/6567C04B2235/658C04B2235/77C04B2235/96C04B2235/9684
Inventor 杨雪金李斌王思青张长瑞李端刘荣军
Owner NAT UNIV OF DEFENSE TECH
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