Processing and oxidation behaviour of C/SiC-SiB4 composite

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摘要

SiB4 powder was infiltrated into porous C/SiC, then a C/SiC-SiB4 composite was densified by using polymer infiltration and pyrolysis (PIP) combined with chemical vapor infiltration (CVI) process. Phase composition and microstructure of the composite were characterized by XRD, EDS and SEM. Oxidation behavior of the composite was investigated in air at temperatures ranging from 500 to 1000°C, and compared with that of densified C/SiC. The results showed that the powder was infiltrated mainly into inter-bundle pores of the as-fabricated composite. It was combined with the subsequent infiltrated SiC very well. The SiB4 powder can hinder the inwards diffusion of oxygen in air, and protect the carbon fibres and interphase from oxidation. At the temperature of 600-900°C after oxidation for 10h, the weight loss rate of the C/SiC-SiB4 composites were less than that of densified C/SiC. The flexural strengths of both C/SiC-SiB4 composites did not decrease obviously, which was higher than that of densified C/SiC.

源语言英语
页(从-至)1982-1984+1988
期刊Gongneng Cailiao/Journal of Functional Materials
39
12
出版状态已出版 - 12月 2008

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