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자료유형
학술저널
저자정보
저널정보
대한전기학회 전기학회논문지 C 전기학회논문지 제55C권 제9호
발행연도
2006.9
수록면
434 - 441 (8page)

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The effect of pressureless-sintered temperature on the densification behavior, mechanical and electrical properties of the SiC-ZrB₂ electroconductive ceramic composites was investigated. The SiC-ZrB₂ electroconductive ceramic composites were pressureless-sintered for 2 hours at temperatures in the range of 1,750~1,900[℃], with an addition of 12[wt%] of Al₂O₃+Y₂O₃(6:4 mixture of Al₂O₃ and Y₂O₃) as a sintering aid. The relative density and mechanical properties are increased markedly at temperatures in the range of 1,850~1,900[℃]. The relative density, flexural strength, vicker's hardness and fracture toughness showed the highest value of 81.1[%], 230[㎫], 9.88[㎬] and 6.05[㎫ㆍm½] for SiC-ZrB₂ composites of 1,900[℃] sintering temperature at room temperature respectively. The electrical resistivity was measured by the Pauw method in the temperature ranges from 25[℃] to 700[℃]. The electrical resistivity showed the value of 1.36×10?⁴, 3.83×10?⁴, 3.51×10?⁴ and 3.2×10?⁴[Ωㆍ㎝] for SZ1750, SZ1800, SZ1850 and SZ1900 respectively at room temperature. The electrical resistivity of the composites was all PTCR(Positive Temperature Coefficient Resistivity). The resistance temperature coefficient showed the value of 4.194×10?³, 3.740×10?³, 2.993×10?³, 3.472×10?³/[℃] for SZ1750, SZ1800, SZ1850 and SZ1900 respectively in the temperature ranges from 25[℃] to 700[℃]. It is assumed that because polycrystallines, such as recrystallized SiC-ZrB₂ electroconductive ceramic composites, contain of porosity and In Situ YAG(Al?Y₃O₁₂) crystal grain boundaries, their electrical conduction mechanism are complicated. In addition, because the condition of such grain boundaries due to Al₂O₃+Y₂O₃ additives widely varies with sintering temperature, electrical resistivity of the SiC-ZrB₂ electroconductive ceramic composites with sintering temperature also varies with sintering condition. It is convinced that β-SiC based electroconductive ceramic composites for heaters or ignitors can be manufactured by pressureless sintering.

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UCI(KEPA) : I410-ECN-0101-2009-560-018841487