Effect of Crystallization of Matrix Phase on the Fracture Toughness of Silicon Nitride Ceramics

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J. Korean Ceram. Soc. > Volume 24(4); 1987 > Article

Journal of the Korean Ceramic Society 1987;24(4): 364.

질화규소 요업체의 기지상 결정화가 파괴인성에 미치는 영향

김남균, 김도연, 강대갑¹

서울대학교 공과대학 무기재료공학과
¹대한중석(주) 기술연구소

Effect of Crystallization of Matrix Phase on the Fracture Toughness of Silicon Nitride Ceramics

ABSTRACT

The Si5AION7 specimens containing 20% YAG composition have been sintered and then heat treated to induce the crystallization of the matrix glassy phase. Crystallization of YAG phase during the heat treatment was detected from the X-ray diffraction patterns and the consequent changes in room temperature toughness as well as in microstructures were investigated. Almost all the glassy boundary phase were found to crystallize even after 5 minutes of heat treatment and the KC at room temperature decreased accordingly. The results show that the matrix crystallization can be induced by slow cooling from the sintering temperature.