SiC被覆C/C複合材料の酸化劣化と強度低下

概要

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In this paper, oxidation behavior of bare and SiC coated C/C composites and its effect on mechanical properties have been studied experimentaly. It was found in oxidation tests that oxidation of an SiC-coated C/C composite occurred by oxygen diffusion through the cracks of SiC coating and thus the weight loss was concentrated just underneath of the coating cracks. Due to this behavior, bending strength degradation of the SiC-coated C/C composite was found to be more serious than that of the bare C/C composite when the comparison was made under the same weight loss level. In particular, it is noted that the bending strength degradation of the SiC-coated C/C composite is more rapid at higher oxidation temperature even in low weight loss condition. On the other hand, interlaminar shear strength, ILSS, degradation was shown to be higher in case of low oxidation temperature than in high oxidation temperature. This tendency suggests that main source of the bending strength degradation of the SiC-coated C/C composite should not be the matrix damages but fiber damages at least under low weight loss level.
一般社団法人日本機械学会の論文
1998-04-26