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Si<sub>3</sub>N<sub>4</sub>/SiC 복합 세라믹의 온도에 따른 크랙 힐링 관찰과 확산거동
송오성,안도 코토지,다카하시 코지,나가오 와타루,류지호,Song, Oh-Sung,Ando, Kotoji,Takahashi, Koji,Nakao, Wataru,Ryu, Ji-Ho 한국재료학회 2005 한국재료학회지 Vol.15 No.12
To investigate the microcrack healing behavior of $Si_3N_4-20wt\%SiC-8wt\%Y_2O_3$ composite ceramics(SNCY8), we observe the crack length evolution a! the time of 20, 40, 60 minutes with in-situ optical microscopy by varying healing temperature of $800\~1200^{\circ}C$. Crack healing obviously occurred as heating temperature and time increased. We proposed a simple model of effective diffusion based on the crack length evolution with healing condition, and determined the effective diffusion coefficient as Our result implies that we may predict the healing ability quantitatively with temperature and time in structural ceramics through the effective diffusion coefficient model.