The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
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Properties of the $\beta-SiC-TiB_2$ Composites with $Al_2O_3+Y_2O_3$ additives

$Al_2O_3+Y_2O_3를 첨가한 {\beta}-SiC-TiB_2$ 복합체의 특성

  • Yim, Seung-Hyuk (Dept.of Electric Electronics Computer Engineering, Sungkyunkwan University) ;
  • Shin, Yong-Deok (Dept.of Electric Electronics Engineering, Wonkwang University) ;
  • Ju, Jin-Young (Dept.of Electric Electronics Engineering, Wonkwang University) ;
  • Yoon, Se-Won (Dept.of Electric Electronics Engineering, Wonkwang University) ;
  • Song, Joon-Tae (Dept.of Electric Electronics Computer Engineering, Sungkyunkwan University)
  • 임승혁 (성균관대 전기전자 및 컴퓨터학부) ;
  • 신용덕 (원광대 전기전자공학부) ;
  • 주진영 (원광대 전기전자공학부) ;
  • 윤세원 (원광대 전기전자공학부) ;
  • 송준태 (성균관대 전기전자 및 컴퓨터학부)
  • Published : 2000.07.01
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Abstract

The mechanical and electrical properties of pressed and annealed $\beta-SiC-TiB_2$ electroconductive ceramic composites were investigated as a function of the liquid forming additives of $Al_2O_3+Y_2O_3$. Phase analysis of composites by XRD revealed $\alpha$-SiC(6H), TiB2, and (Al5Y3O12). Reaction between Al2O3 and $Y_2O_3$ formed YAG but the relative density decreased with increasing $Al_2O_3+Y_2O_3$ contents. The Flexural strength showed the value of 458.9 MPa for composites added with 4 wt% $Al_2O_3+Y_2O_3$ additives at room temperatures. Owing to crack deflection and crack bridging, the fracture toughness showed 6.2, 6.0 and 6.6 MPa.m1/2 for composites added with 4, 8 and 12 wt% Al2O3+Y2O3 additives respectively at room temperature. The resistance temperature coefficient showed the value of $3.6\times10^{-3},\; 2.9\times10^{-3}\; and\; 3.0\times10^{-3} /^{\circ}C$$^{\circ}C$ for composite added with 4, 8 and 12 wt% $Al_2O_3+Y_2O_3$additives respectively at room temperature. The electrical resistivity of the composites was all positive temperature coefficient resistance(PTCR) in the temperature range of $25^{\circ}C\; to\; 700^{\circ}$.

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