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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, performance degradation, structural instability, etc., achieve the average bond length, improve the introduction The effect of improving the quantity and mechanical properties

Active Publication Date: 2020-10-09
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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  • Carbon fiber reinforced SiYOC composite material and preparation method thereof
  • Carbon fiber reinforced SiYOC composite material and preparation method thereof
  • 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 body, yttrium-modified silicon resin is used as a precursor, the C / SiYOC composite material is obtained through repeated dipping, curing and cracking, in the process, a carbon fiber prefabricated part (such as three-dimensional braided fabric, a felt body and the like) is used as a framework, a Y-modified silicon resin precursor is impregnated under a vacuum condition, the C / SiYOC composite material is obtained by performing cross-linking curing on a precursor after thermal treatment, high-temperature cracking is performed to convert the precursor into a SiYOC ceramic matrix, and repeated dipping-curing-cracking is performed when the mass gain of the sample in the period is not more than 1% compared with that of the sample at the end of the previous period. The C / SiOC composite material has the advantages of low cost, good high-temperature resistance, low equipment requirement and the like, and the high-temperature resistance of the C / SiOC composite material can be effectively improved.

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 Applications(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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