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 $\beta-SiC-TiB_2$ Electroconductive Ceramic Composites Densified by Liquid-Phase Sintering

액장 소결한 $\beta-SiC-TiB_2$계 전도성 복합체의 특성

  • 임승혁 (성균관대 대학원 전기전자컴퓨터공학부) ;
  • 신용덕 (원광대 공대 전기전자공학부) ;
  • 송준태 (성균관대 전기전자 및 컴퓨터공학부)
  • Published : 2000.09.01
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Abstract

The mechanical and electrical properties of the hot-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_34. The result of phase analysis of composites by XRD revealed $\alpha-SIC(6H)\;TiB_2,\; and YAG(Al5Y3O12) crystal phase. The relative density and the mechanical properties of composites were increased with increasing $Al_2O_3+Y_2O_34 contents because YAG of reaction between $Al_2O_3\; and\; Y_2O_3$ was increased. The Flexural strength showed the highest value of 432.5MPa for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. Owing to crack deflection crack bridging phase transition and TAG of fracture toughness mechanism the fracture toughness showed 7.1MPa.m1/2 for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. The electrical resistivity and the resistance temperature coefficient showed the lowest of $6.0\times10-4\Omega.cm\; and\; 3.1\times10-3/^{\circ}C4 respectively for composite added with 12wt% \Omega additives at room temperature. The electrical resistivity of the composites was all positive temperature coefficient resistance (PTCR) in the temperature range of $25^{\circ}C\; to\; 700^{\circ}C$.

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References

  1. Patricia A. Hoffman 'Thermo Elastic Properties of Silicon Carbide-Titanium Diboride Particulate Composites' M. S Thesis, 1992
  2. Hideto Hashiguchi and Hisashi Kimugasa 'Electrical Resistivity of ${\alpha}$-SiC Ceramics Added with NiO' J. Ceram. Soc. Japan, 102[2], pp. 160-164, 1994
  3. Yon-Kap Park, Jun-Tae Kim and Yong-Hyuck Baik 'Mechanical Properties and Electrical Discharge Machinability of ${\beta}$-Sialon-TiB2 Composites' J. Mater. Sci. Korean, 5[1], pp. 19-24, 1999
  4. D. L. Jiang, J. H. Wang, Y. L. Li and L. T. Ma. 'Studies on the Strengthening of Silicon Carbide-Based Multiphase Ceramics : The SiC-TiC Systems' Materal Science and Engineering, A 109, pp. 401-406, 1989 https://doi.org/10.1016/0921-5093(89)90621-7
  5. Seung Kun Lee and Chong Hee Kim 'Effect of ${\alpha}$ -SiC versus ${\beta$ -SiC Starting Powders on Microstructure and Fracture Toughness of SiC Sintered with $Al_2O_3-Y_2O_3$ Additives' J. Am. Ceram. Soc. 77[6], pp. 1655-1658, 1994 https://doi.org/10.1111/j.1151-2916.1994.tb09771.x
  6. Young-week Kim, Hamoru Mitome and Hideki Hirotsuru 'Grain Growth and Fracture Toughness of Fine-Grained Silicon Carbide Cermics' J. Am. Ceram. Soc., 78[11], pp. 3145-3148, 1995 https://doi.org/10.1111/j.1151-2916.1995.tb09100.x
  7. Kyeong -Sik Cho, Young-Wook Kim, Heon-Jin Choi and Iune-Gunn Lee 'In Situ-Toughened Silicon Carbide-Titanium Carbide Composites' J. Am. Ceram. Soc., Vol. 79, NO.6, pp. 1711-1713, 1996 https://doi.org/10.1111/j.1151-2916.1996.tb08791.x
  8. N. P. Padture 'In Situ-Toughened Silicon Carbide' J. Am. Ceram. Soc., 77[2], pp. 519-523, 1994 https://doi.org/10.1111/j.1151-2916.1994.tb07024.x
  9. G. C. Wei and P. F. Becher, 'Improvements in Mechanical Properties in SiC by the Addition of TiC Particles' J. Am. Ceram. Soc., Vol. 67, No.8, pp. 571-574, 1984 https://doi.org/10.1111/j.1151-2916.1984.tb19174.x
  10. A. G. Evans and T. R. Wilshaw 'Quasi-Static Solid Particle Demage in Brittle Solids-1 Observation Analysis and Implication' Acta Metallurgica. Vol. 24. pp. 939-956. 1976 https://doi.org/10.1016/0001-6160(76)90042-0
  11. 'Philips Research Reports' Philips Res. Repts 13, 1-9. 1958
  12. Yong Deok Shin 'Electric Discharge Machining of Hot-Pressed SiC-$ZrB_2$ Composites Ceramic' Trans. KIEE. Vol. 46, NO.7, pp, 1062-1067, 1997
  13. Yong Deok Shin and lin Young Ju 'Properties and Manufacture of the \beta-SiC-$ZrB_2$ Composites Densified by Liquid-Phase Sintering' Trans. KIEE. Vol. 48 C, NO 2, pp, 92-97, 1999