Preparation and Research of High-Toughness C/C Composites

Abstract

Abstract: C/C composites are a new type of high-performance composites, but their shortcomings of high brittleness and poor toughness limit their wide application. Therefore, in this study, three kinds of C/C composites were designed and prepared using the chemical vapor infiltration (CVI) method with matrix carbon: rough layer, smooth layer, and rough layer/isotropic layer band-structured pyrolytic carbon(PyC), respectively. And the microstructures, fracture behaviors, and toughening mechanisms of C/C composites were investigated. The results indicate that the flexural strength of the three C/C composites is 189.1, 191.5, and 233.5 MPa, respectively. The C/C composites with rough layer and band-structured carbon matrix are pseudoplastic fractures. In contrast, the C/C composites with smooth layer carbon matrix are brittle fractures. Compared to the C/C composites with rough layer carbon matrix, the C/C composites with band-structured carbon matrix show a significant increase in toughness through interfacial sliding between the different structured pyrolytic carbon, which increases strain amount by about 70%. Therefore, the toughness of C/C composites can be effectively optimized by controlling the parameters of the CVI process to achieve band-structured pyrolytic carbon preparation.

Key words: C/C composite, chemical vapor infiltration, interlayer sliding, fracture mode, band-structure, high-toughness

CLC Number:

TB332

ZHANG Ze, ZHANG Mingyu, FANG Wanxian, XU Ping, ZENG Chen, GAO Ying, SU Zhean, HUANG Qizhong. Preparation and Research of High-Toughness C/C Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1928-1936.

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