| 고온용 ZnO계 열전 재료의 방전플라즈마 소결 특성 및 미세구조 |
| 심광보, 김경훈, 홍영호, 채재홍1 |
세라믹공정연구센터, 한양대학교 세라믹공학과
1요업기술원 연구기획팀 |
| Sintering Characteristics of ZnO Fabricated by Spark Plasma Sintering Process for High Temperature Thermoelectric Materials Application |
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| ABSTRACT |
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M-doped (M=Al, Ni) ZnO thermoelectric materials were fully densified at low temperatures of 800∼1,000$^{circ}C$ and their sintering characteristics and microstructural features were investigated. Electron microscopic analysis showed that the addition of NiO promoted tile formation of solid solution and caused actively grain growth. The addition of A1$_2$O$_3$ prevented the evaporation of pure ZnO at grain boundaries and suppressed the grain growth by the formation of secondary phase. In case of the addition of A1$_2$O$_3$ together with NiO, the specimen showed an excellent microstructure and also the SEM-EBSP (Electron Back-scattered Diffraction Pattern) analysis confirmed that it shows a superior grain boundary distribution to the others specimens. These microstructural characteristics induced by the addition of A1$_2$O$_3$ together with NiO may increase the electrical conductivity by the increase in carrier concentration and decrease the thermal conductivity by the phonon scattering effect and, consequently, improve the thermoelectric property. |
| Key words:
Spark plasma sintering, Thermoelectric material, Microstructure, Thermoelectric property |
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