Oxidation behavior of C/C composites with B4C-SiCZrC-ZrB2 coating prepared by infiltration and pyrolysis

Xiao-Hua Zuo; Zhi-Jun Dong; Guan-Ming Yuan; Zheng-Wei Cui; Xuan-Ke Li

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자료유형: 학술저널

저자정보: Xiao-Hua Zuo (Hubei Polytechnic University) Zhi-Jun Dong (Wuhan University of Science and Technology) Guan-Ming Yuan (Wuhan University of Science and Technology) Zheng-Wei Cui (Wuhan University of Science and Technology) Xuan-Ke Li (Wuhan University of Science and Technology)

저널정보: 한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제22권 제1호

발행연도: 2021.1

수록면: 31 - 38 (8page)

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Polycarbosilane, B-Si and B-Si-Zr modification coal tar pitch were used as impregnate agent for infiltration and pyrolysis formation of carbon/carbon (abbreviated as C/C) composites with B4C-SiC-ZrC-ZrB2 coating. The density of the composites was examined to be 1.0 g·cm-3, 1.4 g·cm-3 and 1.8 g·cm-3, respectively. The phase compositions, surface morphologies and element distributions of the coating were analyzed by X-ray diffraction (XRD) scanning electron microscopy (SEM) and energy dispervive spectroscopy (EDS), respectively. The result showed that the two composites with a density of 1.4 g·cm-3 and 1.8 g·cm-3 displayed compact microstructures. The oxidation behavior of the composites was studied by oxidation in air at temperatures from 800 to 1,550 ℃ for 1 h. The composites with a density of 1.8 g·cm-3 exhibited a lower weight loss of 1.8 % after oxidation. B4C-SiC-ZrC-ZrB2 coating was found to provide the best protection by the precipitated B2O3, SiO2 and ZrO2 on the surface of the composites during the oxidation process, which were characterized by self-healing and antioxidation. The C/C composites with B4C-SiC-ZrC-ZrB2 coating performed well at high temperatures with the formation of complex oxides glass film that prevented oxygen from further spreading into the matrix.

#B4C-SiC-ZrC-ZrB2 coating #C/C composites #Oxidation resistance #Self-healing

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