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J. Korean Ceram. Soc. > Volume 36(8); 1999 > Article
Journal of the Korean Ceramic Society 1999;36(8): 799.
YAG상 첨가 탄화규소-질화규소 복합재료의 기계적 특성
이영일, 김영욱, 최헌진1, 이준근1
서울시립대학교 재료공학과
1한국과학기술원 복합기능세라믹스연구센터
Mechanical Properties of Silicon Carbide-Silicon Nitride Composites Sintered with Yttrium Aluminum Garnet
Composites of SiC-Si3N4 consisted of uniformly distributed elongated $beta$-Si3N4 grains and equiaxed $beta$-SiC grains were fabricated with $beta$-SiC,. $alpha$-Si3N4 Al2O3 and Y2O3 powders. By hot-pressing and subsequent annelaing elongated $beta$-Si3N4 grains were grown via$alpha$longrightarrow$beta$ phase transformation and equiaxed $beta$-Si3N4 composites increased with increasing the Si3N4 content owing to the reduced defect size and enhanced crack deflection by elongated $beta$-Si3N4 grains and the grain boundary strengthening by nitrogen incorporation. Typical flexural strength and fracture toughness of SiC-40 wt% Si3N4 composites were 783 MPa and 4.2 MPa.m1/2 respectively.
Key words: Silicon Carbide, Silicon Nitride, Composite Mechanical Property
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