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A kind of carbon fiber reinforced Siyoc composite material and preparation method thereof

A composite material and carbon fiber technology, which is applied in the field of carbon fiber reinforced SiYOC composite material and its preparation, can solve the problems of limiting C/SiOC composite material's high temperature resistance, structural instability, and performance degradation, and achieve average bond path length and mechanical properties. The effect of increasing and increasing the amount of introduction

Active Publication Date: 2022-04-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the metastable ternary structure of the SiOC ceramic matrix, phase separation and carbothermal reduction reactions will occur at high temperatures, resulting in structural instability and performance degradation, which limits the high temperature resistance of C / SiOC composites.

Method used

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  • A kind of carbon fiber reinforced Siyoc composite material and preparation method thereof
  • A kind of carbon fiber reinforced Siyoc composite material and preparation method thereof
  • A kind of carbon fiber reinforced Siyoc composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of carbon fiber reinforced SiYOC composite material, comprises the following steps:

[0023] (1) Impregnation: Prepare a 2.5-dimensional braid and place it under a vacuum condition with a pressure of less than 500 Pa, and impregnate a modified precursor solution with a Y content of 10% of the mass of the silicone resin for 3 hours; the Y-modified silicone resin The precursor solution is a mixed sol of yttrium sol and silicone resin ethanol solution, wherein the yttrium sol is made of Y(NO 3 ) 2 ·6H 2 O is dissolved in ethanol, the mass ratio of silicone resin and ethanol in the silicone resin ethanol solution is 2:10, and the silicone resin is a small molecular weight methyl silicone resin (MK);

[0024] (2) Curing: place the impregnated carbon fiber preform at 60°C for 72h until it gels, and then cross-link and cure the gelled preform at 200°C for 6h;

[0025] (3) Pyrolysis: The cross-linked and solidified carbon fiber prefabricated part...

Embodiment 2

[0030] A kind of preparation method of carbon fiber reinforced SiYOC composite material, comprises the following steps:

[0031] (1) Impregnation: Prepare a three-dimensional five-directional braid and place it under a vacuum condition with a pressure less than 500 Pa, and impregnate it with a modified precursor solution whose Y content is 50% of the mass of the silicone resin for 2 hours; the Y-modified silicon The resin precursor solution is a mixed sol of yttrium sol and silicone resin ethanol solution, wherein the yttrium sol is made of Y(NO 3 ) 2 ·6H 2 O is dissolved in ethanol, the mass ratio of silicone resin and ethanol in the silicone resin ethanol solution is 5:10, and the silicone resin is a small molecular weight methyl silicone resin (MK);

[0032] (2) Curing: The impregnated carbon fiber is pre-preliminarily placed at 70°C for 36h until it gels, and then the gelled preform is cross-linked and cured at 150°C for 8h;

[0033] (3) Cracking: The cross-linked and s...

Embodiment 3

[0038] A kind of preparation method of carbon fiber reinforced SiYOC composite material, comprises the following steps:

[0039](1) Impregnation: Prepare a three-dimensional needle felt and place it under a vacuum condition with a pressure of less than 500Pa, and impregnate it with a modified precursor solution with a Y content of 15% of the mass of the silicone resin for 4 hours; the Y-modified silicone resin The precursor solution is a mixed sol of yttrium sol and silicone resin ethanol solution, wherein the yttrium sol is made of Y(NO 3 ) 2 ·6H 2 O is dissolved in ethanol, the mass ratio of silicone resin and ethanol in the silicone resin ethanol solution is 3:10, and the silicone resin is a small molecular weight methyl silicone resin (MK);

[0040] (2) Curing: The impregnated carbon fiber preform was left standing at 75°C for 30h until it gelled, and then the gelled preform was crosslinked and cured at 250°C for 4h;

[0041] (3) Cracking: The cross-linked and cured car...

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Abstract

The invention discloses a carbon fiber reinforced SiYOC composite material and a preparation method thereof. A three-dimensional carbon fiber prefabricated part is used as a reinforcement, a yttrium-modified silicone resin is used as a precursor, and a C / SiYOC composite material is obtained by repeated impregnation, curing and cracking. In this process, carbon fiber preforms (three-dimensional braids, felts, etc.) are used as the skeleton, and Y-modified silicone resin precursors are impregnated under vacuum conditions, cross-linked and cured after heat treatment, and then pyrolyzed to convert the precursors It is a SiYOC ceramic matrix, and after repeated dipping-curing-cracking, the C / SiYOC composite material is obtained when the weight of the sample in this cycle does not exceed 1% at the end of the previous cycle. The invention has the advantages of low cost, good high temperature resistance and low equipment requirements, and can effectively improve the high temperature resistance of the C / SiOC composite material.

Description

technical field [0001] The invention belongs to the technical field of high-temperature-resistant ceramic-based composite materials, and in particular relates to a carbon fiber reinforced SiYOC composite material and a preparation method thereof. Background technique [0002] The rapid development of the aerospace field puts forward urgent demands for low-cost, long-life, and ultra-high-temperature structural materials for high-temperature structures. Carbon fiber reinforced ceramic matrix composites have excellent properties such as high temperature resistance, high specific strength, and corrosion resistance, and are widely used in aerospace vehicle surface thermal protection systems and propulsion systems. Carbon fiber-reinforced polysiloxane (PSO) converted to SiOC (C / SiOC) composite has the advantages of short process and low cost, and has become a promising lightweight and high-temperature resistant structural material. [0003] However, due to the metastable ternary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/571C04B35/577C04B35/80C04B35/624
CPCC04B35/571C04B35/5603C04B35/624C04B2235/5248C04B2235/5256C04B2235/616C04B2235/3427C04B2235/3225C04B2235/658C04B2235/656C04B2235/6567C04B2235/96C04B2235/9607
Inventor 郭蕾马青松胡智瑜
Owner NAT UNIV OF DEFENSE TECH
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