상압소결법에 의해 제조한 $\alpha$-SiC의 소결온도에 따른 상전이와 기계적 특성

Phase Transformation and Mechanical Properties on Sintering Temperature of $\alpha$-SiC Manufactured by Pressureless Sintering

  • 주진영 (원광대학교 전기전자 및 정보공학부) ;
  • 신용덕 (원광대학교 전기전자 및 정보공학부) ;
  • 박미림 (원광대학교 전기전자 및 정보공학부) ;
  • 이종덕 (서남대학교 전기전자통신공학부)
  • 발행 : 2001.07.01

초록

The mechanical and phase transformation of the cold isostatically pressed $\alpha$-SiC ceramic were investigated as a function of the sintering temperature. The result of phase analysis by XRD revealed 6H, 4H, 3C and phase transformation between 6H and 4H showed a sudden change over 200$0^{\circ}C$. However, the alongrightarrow$\beta$ reverse transformation did not occur to any sintering temperature. The relative density and the mechanical properties of $\alpha$-SiC ceramic was increased with increased sintering temperature. The flexural strength rapidly inclosed below 210$0^{\circ}C$ and showed the highest value of 410 MPa at 220$0^{\circ}C$. This reason is because crack was propagated through surface flaw. The fracture toughness showed the highest value of 3.3 MPa.m$_{1}$2/ at 220$0^{\circ}C$.

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