Effects of heat treatment on microstructure and thermo-mechanical properties of thin-layered C/C composites
LI Haimei1, LIU Zaidong1, QIAO Zhiwei1, 2, YE Zhiyong1, LIU Junwen1, LI Zhiqiang1, WEI Yanbin1, YU Wenhao1, LONG Quanyuan1, LU Li1, WEN Qingbo1, WANG Yalei1, XIONG Xiang1
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Nanjing Fiberglass Research & Design Institute Co., Ltd, Nanjing 210012, China
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.
李海梅, 刘在栋, 乔志炜, 叶志勇, 刘俊文, 李志强, 魏琰斌, 余文皓, 龙泉源, 卢丽, 文青波, 王雅雷, 熊翔. 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[J]. 粉末冶金材料科学与工程, 2025, 30(5): 433-445.
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. Effects of heat treatment on microstructure and thermo-mechanical properties of thin-layered C/C composites. Materials Science and Engineering of Powder Metallurgy, 2025, 30(5): 433-445.
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2025, Vol. 30 
