Mesophase pitch carbon matrix modified high-thermal-conductivity C / SiC composite material and preparation method thereof

Through the mesophase asphalt carbon matrix modification process, the problems of low thermal conductivity and limited use temperature of C/SiC composites are solved, and the preparation of C/SiC composites with high thermal conductivity and excellent mechanical properties are achieved, simplifying the process and reducing costs.

CN119638467APending Publication Date: 2025-03-18HUNAN UNIV
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Patent Information

Application Number
CN202510030522.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-08
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The existing C/SiC composite materials have low thermal conductivity, limited use temperature, and the high thermal conductivity matrix improvement process is complex and costly.

Method used

The mesophase asphalt carbon matrix modification process is used to obtain high thermal conductivity C/SiC composite materials through phenolic resin solution impregnation, infrared lamp or oven drying, hot-molded pressurized curing, and carbonization treatment.

Benefits of technology

The thermal conductivity and mechanical properties of the composite material are significantly improved, and the bending strength and thermal conductivity reach 176.31MPa-220.89MPa and 124.15W/(m·K)-288.22W/(m·K), respectively, and the preparation process is simplified, the preparation cycle is shortened, and the cost is reduced.

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Abstract

The invention discloses a mesophase pitch carbon matrix modified high-thermal-conductivity C / SiC composite material and a preparation method thereof, the material is subjected to high-thermal-conductivity matrix modification through mesophase pitch melt impregnation, in-situ mesophase inversion and in-situ carbonization, and mesophase pitch carbon fibers are combined as a reinforcement, so that the high-thermal-conductivity C / SiC composite material is obtained. The mesophase pitch carbon matrix modified high-thermal-conductivity C / SiC composite material is obtained by densifying a silicon carbide matrix by adopting a polycarbosilane melt impregnation and in-situ cracking process, has excellent mechanical and high-thermal-conductivity properties, can be widely applied to the front edge, the end head and other parts of a hypersonic aircraft, and can effectively improve the use temperature and the service environment of the material. Meanwhile, the preparation process is simple, the equipment use requirement is low, and the material preparation process period and cost can be correspondingly reduced.
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