Al_4SiC_4-SiC系焼結体の酸化挙動

概要

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Oxidation behavior of Al_4SiC_4-SiC sintered bodies, which were synthesized by using Al, Si and C powders, was investigated under a constant temperature and changing temperature. A protective layer of Al_4SiC_4-SiC sintered bodies, which formed at the beginning of heating in air, inhibited oxidation. Since this protective layer of SiC sintered body consisted of silica phase that was cristobalite and glass, the layer was not stable owing to the formation and growth of pores upon changing temperature. A protective layer of Al_4SiC_4 sintered body consisted of mullite and corundum, but did not sufficiently inhibit oxidation by diffusing oxygen along the grain boundary between mullite and corundum. On the other hand, a protective layer of Al_4SiC_4-SiC sintered bodies sufficiently inhibited the diffusion of oxygen under a changing temperature, because this layer consisted of mullite or mullite and silica. Consequently, Al_4SiC_4-SiC sintered bodies indicated a superior oxidation resistance.
社団法人日本セラミックス協会の論文
2003-02-01