| Title |
Electrical Conductive Mechanism of Hot-pressed α-SiC-ZrB_2 Composites |
| Authors |
신용덕(Shin, Yong-Deok) ; 주진영(Ju, Jin-Young) ; 권주성(Kwon, Ju-Sung) |
| Keywords |
Pauw method ; PTCR ; NTCR. |
| Abstract |
The electrical conductive mechanism and temperature dependence of electrical resistivity of α-SiC-ZrB_2 composites with ZrB_2 contents were investigated. The electrical resistivity of hot-pressed composites was measured by the Pauw method form 25° to 700°C. The electrical resistivity of the composites follow the electrical conduction model for a homogeneous mixture of two kind of particles with different conductivity. Also, the electrical resistivity versus temperature curves indicate the formation of local chains of ZrB_2 particles. In case of α-SiC-ZrB_2 composites containing above 39vol.% ZrB_2 showed positive temperature coefficient resistance(PTCR), whereas the electrical resistivity of α-SiC-21vol.% ZrB_2 showed negative temperature coefficient resistance(NTCR). |