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Preparation method of Cf/BN-SiC composite material

A composite material and prefabricated technology, applied in the field of ceramic matrix composite materials, can solve problems such as insufficient anti-oxidation performance, achieve the effects of good anti-oxidation performance, reduce damage, and improve anti-oxidation performance

Active Publication Date: 2014-09-10
NAT UNIV OF DEFENSE TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a C f / The preparation method of BN-SiC composite material, through in C f BN phase is introduced into the / SiC composite material system to solve the existing C f / SiC composite material insufficient oxidation resistance problem, the technical scheme of the present invention is as follows:

Method used

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  • Preparation method of Cf/BN-SiC composite material
  • Preparation method of Cf/BN-SiC composite material
  • Preparation method of Cf/BN-SiC composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Prepare C f / BN prefab:

[0027] 1. Use carbon fiber needle-punched felt with a fiber volume fraction of 20% as the fiber prefabricated part;

[0028] 2. Using an ethylene glycol dimethyl ether solution with a borazine concentration of 10 vol% as the boron nitride precursor solution;

[0029] 3. Pressurize and cross-link the carbon fiber needle felt in the above-mentioned boron nitride precursor solution for 72 hours, and then crack it in a high-temperature furnace at 1000°C for 1 hour in a nitrogen atmosphere to obtain C with a BN content of 1.6%. f / BN prefab;

[0030] Step 2: Prepare C f / BN-C blank:

[0031] Under vacuum conditions, adopt 50wt.% ethanol solution of phenolic resin to vacuum impregnate C f / BN preform, impregnated for 2 hours, cracked in an argon atmosphere at 1000°C for 1 hour, repeated dipping and cracking 3 times to obtain C f / BN-C bisque, in which the carbon content is 31.7%;

[0032] Step 3: vapor phase siliconizing method will C ...

Embodiment 2

[0035] Step 1: Prepare C f / BN prefab:

[0036] 1. Use carbon fiber needle-punched felt with a fiber volume fraction of 35% as the fiber prefabricated part;

[0037] 2. Using an ethylene glycol dimethyl ether solution with a borazine concentration of 30 vol% as the boron nitride precursor solution;

[0038] 3. Pressurize and cross-link the carbon fiber needle felt in the above-mentioned boron nitride precursor solution for 72 hours, then crack it in a high-temperature furnace at 1000°C for 1 hour under a nitrogen atmosphere, and repeat the dipping and cross-linking-cracking twice to obtain the BN content 11.8% C f / BN prefab;

[0039] Step 2: Prepare C f / BN-C blank:

[0040] Under vacuum conditions, adopt 50wt.% ethanol solution of phenolic resin to vacuum impregnate C f / BN preform, impregnated for 2 hours, cracked at 1000°C for 1 hour under argon atmosphere, and repeated the impregnation-cracking process once to obtain C with a carbon content of 15%. f / BN-C biscuit....

Embodiment 3

[0044] Step 1: Prepare C f / BN prefab:

[0045] 1. Use carbon fiber needle-punched felt with a fiber volume fraction of 32% as the fiber prefabricated part;

[0046] 2. Using an ethylene glycol dimethyl ether solution with a borazine concentration of 20 vol% as the boron nitride precursor solution;

[0047] 3. Pressurize the carbon fiber needle felt in the above-mentioned boron nitride precursor solution for cross-linking for 72 hours, and then crack it in a high-temperature furnace at 1000 °C for 1 hour in a nitrogen atmosphere to obtain C with a BN content of 6.6%. f / BN prefab;

[0048] Step 2: Prepare C f / BN-C blank:

[0049] Under vacuum conditions, adopt 50wt.% ethanol solution of phenolic resin to vacuum impregnate C f / BN preform, impregnated for 2h, cracked at 1000°C for 1h under an argon atmosphere, repeated the impregnation-cracking process twice, and obtained C with a carbon content of 23.3%. f / BN-C biscuit;

[0050] Step 3: vapor phase siliconizing method...

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Abstract

The invention provides a preparation method of a Cf/BN-SiC composite material. The preparation method comprises the steps: by using a carbon fiber needled felt as a reinforcement body and using a glycol dimethyl ether solution of borazine as a BN precursor, preparing a Cf/BN prefabricated component by adopting a precursor infiltration and pyrolysis process, then performing a resin solution infiltration and pyrolysis process on the Cf/BN prefabricated component, preparing a C matrix to obtain a Cf/BN-C biscuit, and finally preparing the Cf/BN-SiC composite material by virtue of a gas phase siliconizing process. The problem that a Cf/SiC composite material is poor in oxidation resistance in the prior art can be solved by adopting the preparation method provided by the invention.

Description

technical field [0001] The invention relates to the field of ceramic matrix composite materials, in particular to a C containing boron nitride component (BN) f / BN-SiC composite material preparation method. Background technique [0002] Carbon fiber reinforced silicon carbide composites (referred to as C f / SiC, the same below) is a widely studied fiber-reinforced ceramic matrix composite material, which first appeared as a thermal structural material and has many excellent properties such as high strength, high modulus, high temperature resistance, thermal shock resistance, and low density. , has broad application prospects in aerospace hot-end components. However, C f / SiC composites still have some shortcomings in terms of performance, because carbon fibers begin to oxidize in an oxygen-containing environment above 400 °C, which will lead to C f The mechanical properties of SiC / SiC composite materials drop sharply. As a material for thermal structural parts, even a ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/583C04B35/622
Inventor 刘荣军张长瑞高世涛曹英斌王思青李斌
Owner NAT UNIV OF DEFENSE TECH
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