A method for reducing the viscosity of polycarbosilane to improve the density of carbon/ceramic composites

A technology of ceramic composite materials and polycarbosilane, which is applied in the field of carbon/ceramic composite materials, can solve the problems of high toxicity of external organic solvents, performance defects of carbon/ceramic materials, and slow curing of PCS, so as to improve impregnation effect and impregnation efficiency , low cost effect
CN112194498BActive Publication Date: 2022-05-03ๅˆ˜ๆ—ญ
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ๅˆ˜ๆ—ญ
Publication Date
2022-05-03

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Abstract

A method for increasing the density of carbon / ceramic composite materials by reducing the viscosity of polycarbosilane, which relates to the field of carbon / ceramic composite materials. Slow solidification occurs, which leads to defects in the properties of the prepared carbon / ceramic materials. The method of the invention is as follows: 1. weighing; 2. preparing uniform mixed solution; 3. impregnating the uniform mixed solution; 4. volatilizing acetone. The invention is easy to operate, and can reduce the viscosity of polycarbosilane from 243.0mpas to 6.0mpas by two orders of magnitude. At the same time, it can greatly reduce the porosity and pore diameter generated in the subsequent curing-cracking process of PCS. The invention is used for preparing high-density carbon / ceramic composite material.
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Description

technical field

[0001] The invention belongs to the field of carbon / ceramic composite materials, and specifically relates to a method for reducing the viscosity of polycarbosilane and improving impregnation efficiency in the process of preparing carbon / ceramic composite materials by PIP method. Background technique

[0002] Carbon / ceramic composites have high specific strength, high specific modulus, excellent room temperature and high temperature mechanical properties, and good oxidation and ablation resistance. They are expected to become important candidate materials for high-temperature structural components such as nose cones and wing leading edges of hypersonic vehicles. . The most common materials in the carbon / ceramic composite system are carbon fiber toughened SiC or ultra-high temperature ceramic modified SiC matrix composites, and the SiC matrix phase is mainly supplied by the impregnation and cracking of polycarbosilane precursors. The traditional polycarbosilan...

Claims

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