热处理对薄层化C/C复合材料微观结构和力热性能的影响

doi:10.19976/j.cnki.43-1448/TF.2025042

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Abstract In this study, thin-layered C/C composites with a spread-stitching architecture were prepared by chemical vapor deposition. The effects of high-temperature heat treatment on the microstructure, mechanical and thermal expansion properties of the C/C composites were systematically investigated. The results indicate that high-temperature heat treatment leads to a reduction of shear strength at interface between the carbon fiber and pyrolytic carbon, while simultaneously enhancing the degree of graphitization in both materials. After high-temperature heat treatment, the tensile strength of the C/C composites increases from 112.3 MPa to 195.3 MPa, which is primarily attributed to the weakened interfacial shear strength. In contrast, the compressive strength decreases from 300.0 MPa to 121.6 MPa, mainly due to the degradation of interlaminar bonding strength, with interlayer delamination identified as the dominant failure mode. Furthermore, the enhanced graphitization degree of the C/C composites after high-temperature heat treatment is demonstrated to be the primary factor governing the increase in modulus and the reduction in the coefficient of thermal expansion of the composites.

Key words： honeycomb sandwich structure thin-layered C/C composite mechanical property thermal expansion property high-temperature heat treatment

Received: 29 April 2025 Published: 27 November 2025

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	LI Haimei
	LIU Zaidong
	QIAO Zhiwei
	YE Zhiyong
	LIU Junwen
	LI Zhiqiang
	WEI Yanbin
	YU Wenhao
	LONG Quanyuan
	LU Li
	WEN Qingbo
	WANG Yalei
	XIONG Xiang

Cite this article:

LI Haimei,LIU Zaidong,QIAO Zhiwei, et al. Effects of heat treatment on microstructure and thermo-mechanical properties of thin-layered C/C composites[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(5): 433-445.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025042 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I5/433

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