| Title |
Effects of Pressure on Properties of SiC-ZrB2 Composites through SPS |
| Authors |
이정훈(Lee, Jung-Hoon) ; 진범수(Jin, Bm-Soo) ; 신용덕(Shin, Yong-Deok) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.11.2083 |
| Keywords |
Spark plasma sintering(SPS) ; Pressuer ; Temperatuer ; Positive temperature coefficient resistance(PTCR) |
| Abstract |
The SiC-ZrB_2 composites were produced by subjecting a 40:60 vol.% mixture of zirconium diboride(ZrB_2) powder and {β}-silicon carbide (SiC) matrix to spark plasma sintering(SPS). Sintering was carried out for 60sec at 1400°C (designation as TP145 and TP146), 1500°C(designation as TP155 and TP156) and uniaxial pressure 50MPa, 60MP under argon atmosphere. The physical, electrical, and mechanical properties of the SiC-ZrB_2 composites were examined. The relative density of TP145, TP146, TP155 and TP156 were 94.75%, 94.13%, 97.88% and 95.80%, respectively. Reactions between { beeta}-SiC and ZrB_2 were not observed via x-ray diffraction (hereafter, XRD) analysis. The flexural strength, 306.23MPa of TP156 was higher than that, 279.42MPa of TP146 at room temperature, but lower than that, 392.30MPa of TP155. The properties of a SiC-ZrB_2 composites through SPS under argon atmosphere were positive temperature coefficient resistance (hereafter, PTCR) in the range from 25°C to 500°C. The electrical resistivities of TP145, TP146, TP155 and TP156 were 6.75×10^{-4}, 7.22×10^{-4}, 6.17×10^{-4} and 6.71×10^{-4}{Ω}·cm at 25°C, respectively. The densification of a SiC-ZrB_2 composite through hot pressing depend on the sintering temperature and pressure. However, it is convinced that the densification of a SiC-ZrB_2 composite do not depend on sintering pressure under SPS. |