| Title |
Development of Electroconductive SiC Ceramic Heater by Spark Plasma Sintering |
| Authors |
신용덕(Shin, Yong-Deok) ; 최원석(Choi, Won-Seok) ; 고태헌(Ko, Tae-Hun) ; 이정훈(Lee, Jung-Hoon) ; 주진영(Ju, Jin-Young) |
| Keywords |
Spark Plasma Sintering(SPS) ; Negative Temperature Coefficient(NTCR) ; Positive Temperature Coefficient(PTCR) ; Heater ; Ignitor |
| Abstract |
The composites were fabricated by adding 0, 15, 30, 45[vol.%] ZrB_2 powders as a second phase to SiC matrix. The physical, mechanical and electrical properties of electroconductive SiC ceramic composites by spark plasma sintering(SPS) were investigated. Reactions between {β}-SiC and ZrB_2 were not observed in the XRD and the phase analysis of the electroconductive SiC ceramic composites. The relative density of mono {β}-SiC, {β}-SiC+15[vol.%]ZrB_2, {β}-SiC+30[vol.%]ZrB_2 and {β}-SiC+45[vol.%]ZrB_2 composites are respectively 99.24[%], 87.53[%], 96.41[%] and 98.11[%] Phase analysis of the electroconductive SiC ceramic composites by XRD revealed mostly of {β}-SiC, ZrB_2 and weakly of ZrO_2 phase. The flexural strength showed the lowest of 114.44[MPa] for {β}-SiC+15[vol.%]ZrB_2 powders and showed the highest of 210.75[MPa] for composite no added with ZrB_2 powders at room temperature. The trend of the mechanical properties of the electroconductive SiC ceramic composites is accorded with the trend of the relative density. The electrical resistivity of the electroconductive SiC ceramic composites decreased with increased ZrB_2 contents. The electrical resistivity of mono {β}-SiC, {β}-SiC+15[vol.%]ZrB_2, {β}-SiC+30[vol.%]ZrB_2 and {β}-SiC+45[vol.%]ZrB_2 composites are respectively 4.57×10^{-1}, 2.13×10^{-1}, 2.68×10^{-2} and 1.99×10^{-2}[{Ω}·cm] at room temperature. The electrical resistivity of mono {β}-SiC and {β}-SiC+15[vol.%]ZrB_2 are negative temperature coefficient resistance(NTCR) in temperature ranges from 25[°C] to 100[°C]. The electrical resistivity of {β}-SiC+30[vol.%]ZrB_2 and {β}-SiC+45[vol.%]ZrB_2 are positive temperature coefficient resistance(PTCR) in temperature ranges from 25[°C] to 100[°C]. It is convinced that {β}-SiC+30[vol.%]ZrB_2 composites by SPS for heater or ignitors can be applied. |