SPS에 의한 SiC-ZrB₂ 도전성 복합체 특성 = The Properties of Electroconductive SiC-ZrB₂ composite through SPS

다국어 초록 (Multilingual Abstract)

The composites were fabricated by adding 30, 35, 40,45vol.% Zirconium Diboride(ZrB₂) powders as a second phase to Silicon Carbide(SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC-ZrB₂ ceramic composites by Spark Plasma Sintering(SPS) were examined. the relative density of SiC+30vol.%ZrB₂, SiC+35vol.%ZrB₂, SiC+40vol.%ZrB₂, and SiC+45vol.%ZrB₂ composites are 88.64, 76.80, 79.09, and 88.12%, respectively. The XRD phase analysis of the electroconductive SiC-ZrB₂ ceramic composites not observed reactions between β-SiC and ZrB₂, and reveals high of SiC and ZrB₂ , and low of ZrO₂ phase. The electrical resistivity of SiC+30vol.%ZrB₂, SiC+35vol.%ZrB₂, SiC+40vol.%ZrB₂, and SiC+45vol.%ZrB₂ composites are 6.74×10？⁴, 4.56×10？³, 1.92×10？³, and 4.95×10？³Ω · ㎝ at room temperature, respectively. And all of that have Positive Temperature Coefficient Resistance(PTCR) in temperature range from 25℃ to 500℃