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Method for preparing carbon fibre reinforced carborundum composite material

A technology of composite materials and silicon carbide, which is applied in the field of preparation of silicon carbide-based composite materials, can solve the problems of C/SiC composite materials, such as the influence of oxidation resistance, precursors that cannot be reused, and free carbon content increase, so as to reduce maintenance work , Improve the service life and reduce the free carbon content

Inactive Publication Date: 2010-08-18
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used PCS / DVB is vacuum impregnated and solidified in situ in the container, so that the cured precursor cannot be reused, resulting in great waste
At the same time, the PCS / DVB system also has shortcomings such as poor stability, inability to store for a long time, and the need to use and configure immediately.
In addition, DVB is both a solvent and a crosslinking agent, so the introduction of DVB will cause an increase in the free carbon content of the final cracking product of PCS / DVB, which will have a negative impact on the oxidation resistance of the final C / SiC composite.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] PCS, DVB, and Xylene were formulated into a uniform precursor solution in a mass ratio of 1:0.3:0.3, and 4-tert-butylcatechol with 1% of the mass of DVB was added, and stirring was continued for 2 hours to obtain a precursor impregnation solution (room temperature Viscosity 0.55Pa-s).

[0022] Put the carbon fiber prefabricated part (three-dimensional four-way weaving, fiber volume fraction 48%) in the impregnation tank, first evacuate until the vacuum degree is lower than 100Pa, turn off the vacuum pump and add the precursor impregnation solution into the impregnation tank, and the impregnation lasts for 2 hours. Then take it out and dry it naturally for 10 hours; put the above-mentioned vacuum impregnated and dried carbon fiber preform in an oven, and keep it at a temperature of 120°C for 3 hours for preliminary crosslinking, and then keep it at a temperature of 180°C for 3 hours Carry out curing and cross-linking; finally, the above-mentioned cross-linked and cured c...

Embodiment 2

[0024] PCS, DVB, and xylene were formulated into a uniform precursor solution in a mass ratio of 1:0.4:0.2, and the rest of the process steps and conditions were the same as in Example 1.

[0025] The density of the C / SiC composite material prepared by the above steps is 1.64 g cm -3 , the bending strength is 476.90MPa, and the utilization rate of precursor PCS is 61.50%.

Embodiment 3

[0027] Prepare PCS and DVB in a mass ratio of 1:1 to form a homogeneous precursor solution, without adding co-solvent, and the remaining process steps and conditions related to the preparation of precursor solution, vacuum impregnation, cross-linking curing and pyrolysis are the same as in Example 1 The same, but in the final repeated densification process, the cycle of repeating vacuum impregnation-crosslinking curing-high temperature cracking is reduced from 12 times to 9 times.

[0028] The density of the C / SiC composite material prepared by the above steps is 1.67g cm -3 , the flexural strength is 350.19MPa, and the utilization rate of precursor PCS is 78.11%.

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PUM

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Abstract

The invention discloses a preparation method for C / SiC composite material, comprising steps as follows: polycarbonsilane (PCS) and divinylbenzene (DVB) solution is prepared in advance; fiber prefabricated product is vacuum impregnated in the solution, and then taken out and dried for cross-bonding and curing; eventually the C / SiC composite is made through high-temperature pyrolysis and repeated densification. Xylene is added in the solution for hydrotropy and reduction of the solution viscosity, so as to improve the performance of the impregnation process; inhibitor is added in improving the storage performance of the PCS and DVB system, so as to realize the long-term repeated usage of the PCS and DVB system. Compared with the traditional PCS and xylene impregnating solution, the PCS and DVB system has the advantages of remarkably improving the use ratio of the PCS, shortening the preparation cycle of the C / SiC composite, and greatly reducing the preparation cost of the C / SiC composite.

Description

technical field [0001] The invention relates to a preparation method of a ceramic-based composite material and components, in particular to a preparation method of a silicon carbide-based composite material. Background technique [0002] Carbon fiber reinforced silicon carbide composite (C / SiC) fully combines the advantages of carbon fiber and silicon carbide (SiC) matrix, exhibiting low density, high strength, high toughness, high temperature resistance, ablation resistance, erosion resistance, high hardness and high Abrasion resistance and other characteristics. At present, it is generally believed that C / SiC composite materials have broad application prospects in aerospace, energy technology, chemical industry, transportation industry and other fields. The precursor infiltration pyrolysis process (precursor infiltration pyrolysis, PIP) is a new material preparation process that has developed extremely rapidly in the past ten years, that is, the inorganic ceramic matrix i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
Inventor 胡海峰陈朝辉张玉娣陆阳伟王松王其坤
Owner NAT UNIV OF DEFENSE TECH
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