Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Silicon Carbide Ceramics with Self-reinforced Microstructure by the Control of Starting Phases

출발상 제어에 의한 자기복합화 미세구조의 탄화규소 세라믹스 제조

  • 이종국 (조선대학교 재료공학과) ;
  • 강현희 (조선대학교 재료공학과) ;
  • 이은구 (조선대학교 재료공학과) ;
  • 김환 (서울대학교 무기재료공학과)
  • Published : 1997.12.01
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Abstract

Silicon carbides with self-reinforced microstructure which hore a small grain matrix and dispersed large grains with rod-like type were prepared by the liquid-phase sintering and the control of starting phases of raw materials. The specimens with self-reinforced microstructure could be obtained from the compacts with mixed compositions of $\alpha$-SiC and 10-50 % $\beta$-SiC powders and by the pressureless sintering at 185$0^{\circ}C$ for 5h. Large grains with rod or plate-like types were 4H-SiC and small grains with equi-axed type were 6H-SiC. Fracture grains with rod or plate-like types were 4h-SiC and small grains with equi-axed type were 6H-SiC. Fracture toughness of specimens with self-reinforced microstructure was increased by the crack deflection and formation of microcracking due to the existence of rod-like large grains during crack propagation.

Keywords

References

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