Effects of Y2O3–RE2O3 (RE = Sm,Gd, Lu) Additives on Electrical and Thermal Properties of Silicon Carbide Ceramics |
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| Authors: | Seung Hoon Jang Kwang Joo Kim Seoung‐Jae Lee Kwang‐Young Lim |
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| Affiliation: | 1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul, Korea;2. Department of Physics, Konkuk University, Seoul, Korea;3. Materials Development Section, KEPCO Nuclear Fuel, Daejeon, Korea |
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| Abstract: | In this study, we investigated the electrical and thermal properties of SiC ceramics with 2 vol% equimolar Y2O3–RE2O3 (RE = Sm, Gd, Lu) additives. The three SiC ceramics with 2 vol% equimolar Y2O3–RE2O3 additives showed electrical conductivities on the order of ~103 (Ω·m)?1, which is one order of magnitude higher than that of the SiC ceramics sintered with 2 vol% Y2O3 only. The increase in electrical conductivity is attributed to the growth of heavily nitrogen‐doped SiC grains during sintering and the confinement of oxide additives in the junction area. The thermal conductivities of the SiC ceramics were in the 176–198 W·(m·K)?1 range at room temperature. The new additive systems, equimolar Y2O3–RE2O3, are beneficial for achieving both high electrical conductivity and high thermal conductivity in SiC ceramics. |
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