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논문 기본 정보

저자정보
(원광대학교) (군장대학교) (전기안전공사) (원광대학교) (원광대학교) (원광대학교) (원광대학교)
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대한전기학회 전기학회논문지 전기학회논문지 제58권 제9호
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    초록·키워드

    The composites were fabricated by adding 0, 15, 20, 25[vol.%] Zirconium Diboride(hereafter, ZrB₂) powders as a second phase to Silicon Carbide(hereafter, SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC ceramic composites by Spark Plasma Sintering(hereafter, SPS) were examined. Reactions between β-SiC and ZrB₂ were not observed in the XRD analysis. The relative density of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 90.93[%], 74.62[%], 74.99[%] and 72.61[%], respectively. The XRD phase analysis of the electroconductive SiC ceramic composites reveals high of SiC and ZrB₂ and low of ZrO₂ phase. The lowest flexural strength, 108.79[㎫], shown in SiC+15[vol.%] ZrB₂ composite and the highest - 220.15[㎫] - in SiC+20[vol.%] ZrB₂ composite at room temperature. The trend of the mechanical properties of the electroconductive SiC ceramic composites moves in accord with that of the relative density. The electrical resistivities of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 4.57×10?¹, 2.13×10?¹, 1.53×10?¹ and 6.37×10?²[Ωㆍ㎝] at room temperature, respectively. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ are Negative Temperature Coefficient Resistance(hereafter, NTCR) in temperature ranges from 25[℃] to 100[℃]. The declination of V-I characteristics of SiC+20[vol.%]ZrB₂ composite is 3.72×10?¹. It is convinced that SiC+20[vol.%]ZrB₂ composite by SPS can be applied for heater or electrode above 1000[℃]

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      UCI(KEPA) : I410-ECN-0101-2010-560-002257074