1301 窒化ケイ素/炭化ケイ素複合材の圧縮応力下におけるき裂治癒挙動(J14-1 知的材料・構造システム(1) セラミックスのき裂治癒、強靭化,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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The crack-healing behavior under compressive stress of Si_3N_4/SiC Composite was investigated. Effect of compressive stress on strength recovery by crack-healing at 1000℃ for 5 h in air was studied. A semi-elliptical surface crack about 100pm in diameter was introduced on the center of specimen. Followings are main conclusions obtained; (1) Under compressive stress, the strength of pre-crack specimens increased by crack-healing. (2)The pre-crack was healed, and the strength recovered under tensile stress and no stress. (3) Under 400MPa of tensile stress, specimens fractured before healing. But under 400MPa of compressive stress, specimens healed a crack. Therefore, it was found that crack-healing is effective not only under tensile stress but also under compressive stress.
2008-08-02