Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Self-reinforced Silicon Carbide Ceramics by Hot Pressing

가압소결에 의한 자체강화 탄화규소 세라믹스의 제조

  • Park, Jong-Gon (Department of Materials Engineering, Chosun University) ;
  • Lee, Jong-Kook (Department of Materials Engineering, Chosun University) ;
  • Seo, Dong-Seok (Department of Materials Engineering, Chosun University) ;
  • Kim, Min-Jeong (Department of Materials Engineering, Chosun University) ;
  • Lee, Eun-Gu (Department of Materials Engineering, Chosun University) ;
  • Kim, Hwan (Division of Materials Engineering, Seoul National University)
  • 박종곤 (조선대학교 재료공학과) ;
  • 이종국 (조선대학교 재료공학과) ;
  • 서동석 (조선대학교 재료공학과) ;
  • 김민정 (조선대학교 재료공학과) ;
  • 이은구 (조선대학교 재료공학과) ;
  • 김환 (서울대학교 재료공학부)
  • Published : 1999.12.01
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Abstract

Self-reinforced silicon carbide was prepared by hot pressing and the control of starting phases of raw materials and its microstructural characteristics was investigated. The specimens with self-reinforced microstructure were obtained from the compacts with mixed compositions of ${\alpha}$-and ${\beta}$-SiC powders. Self-reinforced microstructure which is composed of large dispersed grains with rod-like shape and matrix with small equiaxed grains was formed by the transformation to the ${\alpha}$-SiC with 4H polytype for ${\beta}$-SiC and anisotropic grain growth during the heat treatment. Of all speimens the values of volume fraction maximum length and aspect ratio for large grains with rode-like types were the highest at the specimen with 50 vol% ${\beta}$-SiC in the starting SiC powder and therefore this specimen showed the highest fracture toughness due to the crack deflection by rod-like grains during crack propagation.

출발원료의 상분을 제어와 가압소결 및 열처리에 의하여 자체강화 미세구조를 갖는 탄화규소 세라믹스를 제조하여 그 특성을 고찰하였다. 자체강화 탄화규소 세라믹스는 알파상과 베타상 탄화규소 분말을 혼합한 모든 원료조합으로부터 얻어졌으며, 이러한 미세구조는 열처리 동안 베타상 탄화규소 입자가 긴 막대상 입자 형태를 갖는 4H 상의 알파 탄화규소로 상변태하면서 형성되었다. 긴 막대상의 탄화규소 입자의 부피분율 및 장단축비는 베타상 탄화규소 분말의 함유량이 50%인 시편에서 가장 크게 나타났으며, 이로 인하여 이 시편은 제조된 시편 중에서 가장 높은 인성을 나타내었다.

Keywords

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