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High-performance C/SiBCN composite material as well as preparation method and application thereof

A composite material and high-performance technology, which is applied in the field of high-performance C/SiBCN composite materials and its preparation, can solve the problems of low mechanical properties of C/SiBCN composite materials, and achieve the goal of improving impregnation efficiency, impregnation depth, and mechanical properties Effect

Active Publication Date: 2020-11-17
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN104591768A adopts silikyne modified SiBCN precursor, adopts PIP process to prepare C / SiBCN composite material, and the bending strength at room temperature can only reach 374MPa
[0004] In summary, the mechanical properties of C / SiBCN composites are relatively low at present and need to be further improved

Method used

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  • High-performance C/SiBCN composite material as well as preparation method and application thereof
  • High-performance C/SiBCN composite material as well as preparation method and application thereof

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preparation example Construction

[0028] The present invention provides a kind of preparation method of high-performance C / SiBCN composite material in the first aspect, described method comprises the steps:

[0029] (1) Prepare C interface layer, SiC interface layer and / or (C / SiC) consisting of C interface layer and SiC interface layer alternately deposited on the surface of carbon fiber preform n Alternate the interface layer to obtain a modified carbon fiber preform; in the present invention, the carbon fiber preform, for example, can adopt a 3D structure porous carbon fiber preform such as a needle-punched structure, a two-dimensional carbon cloth laminated stitching structure, or a finely punctured puncture; In the invention, for example, the C interface layer, the SiC interface layer and / or the (C / SiC) interface layer can be prepared by a CVI process. n Alternating interfacial layers; in the present invention, the (C / SiC) n Alternate interface layer is denoted as C, SiC alternate interface layer;

[003...

Embodiment 1

[0053] ①The carbon fiber prefabricated body with carbon cloth laminated stitching structure is adopted, and the density of the prefabricated body is 0.65~0.80g / cm 3 , using the CVI process (CVI) to prepare the C interface layer, the deposition time is 100h, and the modified carbon fiber preform is obtained.

[0054] ②Using the liquid SiBCN precursor (liquid polyborosilazane) as the impregnating liquid, the modified carbon fiber preform is densified by the PIP process of vacuum impregnation / in-situ curing / medium pressure cracking, vacuum impregnation, original In-situ curing and medium pressure cracking, this is a PIP process of vacuum impregnation / in-situ solidification / medium pressure cracking; the number of cycles of the PIP process of vacuum impregnation / in-situ solidification / medium pressure cracking is 6 times, obtaining High-performance C / SiBCN composite material; each PIP process of vacuum impregnation / in-situ curing / medium pressure cracking is as follows: the modified ...

Embodiment 2

[0057] ①The carbon fiber prefabricated body with carbon cloth laminated stitching structure is adopted, and the density of the prefabricated body is 0.65~0.80g / cm 3 , using the CVI process (CVI) to prepare the SiC interface layer, the deposition time is 100h, and the modified carbon fiber preform is obtained.

[0058] ②Using the liquid SiBCN precursor (liquid polyborosilazane) as the impregnating liquid, the modified carbon fiber preform is densified by the PIP process of vacuum impregnation / in-situ curing / medium pressure cracking, vacuum impregnation, original In-situ curing and medium pressure cracking, this is a PIP process of vacuum impregnation / in-situ solidification / medium pressure cracking; the number of cycles of the PIP process of vacuum impregnation / in-situ solidification / medium pressure cracking is 6 times, obtaining High-performance C / SiBCN composite material; each PIP process of vacuum impregnation / in-situ curing / medium pressure cracking is as follows: the modifie...

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Abstract

The invention relates to a high-performance C / SiBCN composite material as well as a preparation method and application thereof. The method comprises the following steps: preparing a C interface layer,a SiC interface layer and / or a (C / SiC)n alternate interface layer, which is formed by alternate deposition of the C interface layer and the SiC interface layer, on the surface of a carbon fiber preform to obtain a modified carbon fiber preform; and with a liquid SiBCN precursor as an impregnation liquid, carrying out SiBCN matrix densification on the modified carbon fiber preform through a vacuumimpregnation / in-situ curing / medium-pressure cracking PIP process to obtain the high-performance C / SiBCN composite material. According to the invention, the proper interface layers are prepared, so atoughening function is achieved; an in-situ curing process is adopted, so outflow of the precursor in the curing process is avoided, and impregnation depth and impregnation efficiency are improved; and meanwhile, a medium-pressure cracking process is adopted, so SiBCN matrix cracks are reduced, the porosity of the material is reduced, and the mechanical property of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal structural composite materials, in particular to a high-performance C / SiBCN composite material and its preparation method and application. Background technique [0002] C / SiBCN ceramic matrix composites have a series of excellent properties such as low density, high temperature resistance, high specific modulus, high specific strength and oxidation resistance, and have broad application prospects in the aerospace field. Quaternary SiBCN amorphous ceramic matrix, due to the introduction of boron, the SiBCN precursor generates BN / B during the ceramic conversion process 4 Phase C, BN / B 4 Phase C itself has good high-temperature thermal stability, which increases the crystallization temperature of the material, greatly improves the high-temperature resistance of the ceramic matrix, and has excellent mechanical properties and oxidation resistance at room temperature and high temperature. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/89C04B41/52C04B41/5001C04B41/4529C04B41/5059C04B41/5053C04B41/4539C04B41/0072
Inventor 李晓东刘俊鹏于新民霍鹏飞王涛张宝鹏宋环君王鹏
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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