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

The Korean Institute of Electrical Engineers (대한전기학회)
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The Properties of $\beta-SiC-ZrB_2$ Electroconductive Ceramic Composites with $Al_2O_3+Y_2O_3$Contents

$Al_2O_3+Y_2O_3 첨가량에 따른 {\beta}-SiC-ZrB_2$계 전도성 복합체의 특성

  • Shin, Yong-Deok (Dept.of Electric Electronics Information Engineering, Engineering College, Wonkwang University) ;
  • Ju, Jin-Young (Dept.of Electric Electronics Information Engineering, Engineering College, Wonkwang University) ;
  • Hwang, Chul (Dept.of Electric Electronics Information Engineering, Engineering College, Wonkwang University)
  • 신용덕 (원광대 전기전자공학부) ;
  • 주진영 (원광대 전기전자공학부) ;
  • 황철 (원광대 전기전자공학부)
  • Published : 2000.09.01
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Abstract

The mechanical and electrical properties of the hot-pressed and annealed $\beta-SiC-ZrB_2$ 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 $\alpha-SiC(6H) ZrB_2\; and YAG(Al_5Y_3O_{12})$ The relative density of composites were increased with increased Al2O3+Y2O3 contents. The Flexural strength showed the highest value of 390.6MPa for composites added with 20wt% Al2O3+Y2O3 additives at room temperature. Owing to crack deflection crack bridging phase transition and YAG of fracture toughness mechanism the fracture toughness showed the highest value of 6.3MPa.m1/2 for composites added with 24wt% Al2O3+Y2O3 additives at room temperature. The resistance temperature coefficient showed the value of$ 2.46\times10^{-3}\;, 2.47\times10^{-3},\; 2.52\times10^{-3}/^{\circ}C$ for composite added with 16, 20, 24wt% Al2O3+Y2O3 additives respectively. The electrical resistivity of the composites was all positive temperature coefficient resistance(PTCR) in the temperature range of $256{\circ}C\; to\; 900^{\circ}C$.

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References

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