Preparation of Silicon Carbide with Sialon

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J. Korean Ceram. Soc. > Volume 37(3); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(3): 247.

시알론을 첨가한 탄화규소 세라믹스의 제조

이종국, 박종곤, 이은구, 김환

조선대학교 재료공학과

Preparation of Silicon Carbide with Sialon

ABSTRACT

Silicon carbide with sialon was prepared by hot pressing and transient liquid-phase sintering, and the effects of sintering atmosphere and starting phases on their microstructural characteristics were investigated. The sintered SiC with Sialon composition(Y2O3, AlN, Si3N4) in argon atmosphere had high sintered density and large aspect ratio. But sintered specimens in nitrogen atmosphere showed low aspect ratio and small grian size, becuase of the retardation of phase transformation and grain growth. Addition of Y-Sialon powder to SiC also retarded the phase transformation to ${alpha}$-SiC from ${beta}$-SiC and densification. The SiC specimen prepared from the starting ${beta}$-SiC powder with Sialon composition(Y2O3, AlN, Si3N4) showed the highest fracture toughness about 6.0 MPa$.$m1/2.

Key words: Silicon carbide, Sialon, Liquid-phase sintering, Hot pressing