Oxidation Behavior of <TEX>$SiC/MoSi_2$</TEX> Composites Prepared by Reaction Sintering Method

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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(12): 1588.

반응소결에 의하여 제조된 $SiC/MoSi_2$ 복합체의 산화 거동

양준환, 한인섭¹, 우상국¹, 서동수

충남대학교 공과대학 재료공학과
¹한국에너지기술연구소 에너지재료연구팀

Oxidation Behavior of $SiC/MoSi_2$ Composites Prepared by Reaction Sintering Method

ABSTRACT

The SiC/MoSi2 composite materials were fabricated by infiltrating the mixture of molybdenum disilicide and metal silicon(MoSi2+Si=100) to a porous compact of silicon carbide and graphite under the vacuum atmosphere of 10-1 torr. The specimen were oxidized in dry air under 1 atm at 130$0^{circ}C$~150$0^{circ}C$ for 240 hours. The oxidation behavior was evaluated by the weight gain and loss per unit area of the oxidized samples. Also, SEM and XRD analysis of the oxidized surface of the samples were carried out. With increasing the MoSi2 content and oxidation temperature, the passive oxidation was found. The trend of weight gain of all samples was followed the parabolic rate law with the formation of a protective layer of cristobalite on the surface.