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자료유형
학술저널
저자정보
저널정보
대한전기학회 전기학회논문지 C 전기학회논문지 제55C권 제11호
발행연도
2006.11
수록면
505 - 513 (9page)

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The present study investigated the influence of the content of Al₂O₃+Y₂O₃ sintering additives on the microstructure, mechanical and electrical properties of the pressureless-sintered SiC-ZrB₂ electroconductive ceramic composites. Phase analysis of composites by XRD revealed mostly of α-SiC(4H), ZrB₂, β-SiC(15R) and In Situ YAG(Al?Y₃O₁₂). The relative density and the flexural strength showed the highest value of 86.8[%] and 203[㎫] for SiC-ZrB₂ composite with an addition of 8 and 12[wt%] Al₂O₃+Y₂O₃ as a sintering aid at room temperature respectively. Owing to crack deflection and crack bridging of fracture toughness mechanism, the fracture toughness showed 3.7 and 3.6[㎫ㆍm<SUP>1/2</SUP>] for SiC-ZrB₂ composites with an addition of 8 and 12[wt%] Al₂O₃+Y₂O₃ as a sintering aid at room temperature respectively. Abnormal grain growth takes place during phase transformation from β-SiC into α-SiC was correlated with In Situ YAG phase by reaction between Al₂O₃ and Y₂O₃ additives during sintering. The electrical resistivity showed the lowest value of 6.5×10?³ [Ωㆍ㎝] for the SiC-ZrB₂ composite with an addition of 8[wt%] Al₂O₃+Y₂O₃ as a sintering aid at room temperature. The electrical resistivity of the SiC-ZrB₂ composites was all positive temperature coefficient(PTCR) in the temperature ranges from 25[℃] to 700[℃]. The resistance temperature coefficient showed the highest value of 3.53×10?³/[℃] for SiC-ZrB₂ composite with an addition of 8[wt%] Al₂O₃+Y₂O₃ as a sintering aid in the temperature ranges from 25[℃] to 700[℃]. In this paper, it is convinced that β-SiC based electroconductive ceramic composites for heaters or ignitors can be manufactured by pressureless sintering.

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