The Estimation for Mechanical and Electrical Properties of $\beta$-SiC-$TiB_2$ Composites by $TiB_2$

$TiB_2$ 첨가량에 따른 $\beta$-SiC-$TiB_2$ 복합체의 전기적.기계적 특성 평가

  • 박미림 (원광대학교 전기전자 및 정보공학부) ;
  • 신용덕 (원광대학교 전기전자 및 정보공학부) ;
  • 주진영 (원광대학교 전기전자 및 정보공학부) ;
  • 최광수 (원광대학교 전기전자 및 정보공학부) ;
  • 이동윤 (원광대학교 전기전자 및 정보공학부) ;
  • 소병문 (익산대학 전기과)
  • Published : 2001.11.03

Abstract

The mechanical and electrical properties of the pressureless annealed SiC-$TiB_2$ electro conductive ceramic composites were investigated as functions of the transition metal of $TiB_2$. The result of phase analysis for the SiC-$TiB_2$ composites by XRD revealed $\alpha$-SiC(6H). $TiB_2$, and YAG($Al_5Y_3O_{12}$) crystal phase. The relative density showed the lowest 84.8% for the SiC-$TiB_2$ composites added with 39vol.%$TiB_2$. Owing to crack deflection, crack bridging and YAG of fracture toughness mechanism, the fracture toughness showed the highest value of $7.8\;MPa{\cdot}m^{1/2}$ for composites added with 39vol.%$TiB_2$ under a pressureless annealing at room temperature. The electrical resistivity of the SiC-27vol.%$TiB_2$ composites was negative temperature coefficient resistance(NTCR), and the electrical resistivity of the besides SiC-27vol.%$TiB_2$ composites was all positive temperature coefficient resistance(PTCR) in the temperature range of $25^{\circ}C$ to $700^{\circ}C$.

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