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Qiu H.-P.,Composite Material Technology Center | Chen M.-W.,Composite Material Technology Center | Li X.-Q.,Composite Material Technology Center | Wang Y.,Composite Material Technology Center | Xie W.-J.,Composite Material Technology Center
Xinxing Tan Cailiao/New Carbon Materials | Year: 2014

Carbon fiber-reinforced carbon composites (C/C), carbon fiber reinforced-carbon and silicon carbide binary matrix composites (C/C-SiC) and carbon fiber reinforced carbon-silicon-zirconium-oxygen matrix composites (C/C-Si-Zr-O) were prepared through a combination of chemical vapor infiltration (CVI) and polymer impregnation pyrolysis. The microscopic morphology, phase structure, mechanical properties and thermal conductivity of the C/C, C/C-SiC and C/C-Si-Zr-O composites were investigated by SEM, XRD, EDA and laser flash thermal conductive measurements. Results showed that the flexural strength of the C/C-Si-Zr-O composites was higher than that of the C/C and the C/C-SiC composites, which can be ascribed to their energy absorption mechanisms, such as fiber debonding and pull-out from the matrix. The C/C composites possessed the highest thermal conductivity (69.09 W/(m·K) in the parallel direction and 25.28 W/(m·K) in the vertical direction), which can be accounted for by the high thermal conductivity of the pyrocarbon matrix, a low porosity of the composites, a long phonon mean free path and fewer structural defects. ©, 2014, Editorial Board of New Carbon Materials. All right reserved. Source

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