Study on the thermal expansion properties of C/C composites |
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| Authors: | Xiaoling Liao Hejun Li Wenfeng Xu Kezhi Li |
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| Affiliation: | (1) Research Center of Carbon/Carbon Composites, National Key Laboratory of Ultrahigh Temperature Composites, Northwestern Polytechnical University, Xi’an, 710072, China;(2) Chemistry and Environment Science Department, Chongqing University of Arts and Sciences, Chongqing, 402160, China;(3) Department of Materials Science and Engineering, Northwestern Polytechnical University, 127, West Youyi Road, Xi’an, 710072, China |
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| Abstract: | Two different woven (2D and 3D) carbon/carbon composites (C/C) and a block carbon have been prepared by chemical vapor infiltration
(CVI). The effects of the density and porosity of composites, preform architectures and heat treatment on the thermal expansion
properties of the C/C composites were investigated. It is revealed that the coefficient of thermal expansion (CTE) of C/C
composites is negative below 100 °C, and the CTE values are inversely proportion to its porosity. Comparing with 2D C/C composites,
3D C/C composites have a better thermal stability. Heat treatment can increase the thermal stability of composites by changing
interfacial thermal stress. The thermal expansion behavior of C/C composites is considered as the result of interaction between
fibers and matrix. |
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