Effects of Y2 O3 -RE2 O3 (RE = Sm, Gd, Lu) Additives on Electrical and Thermal Properties of Silicon Carbide Ceramics
| Autor: | Kwang-Young Lim, Young-Wook Kim, Kwang Joo Kim, Seoung-Jae Lee, Seung Hoon Jang |
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| Rok vydání: | 2015 |
| Předmět: |
010302 applied physics
Materials science Metallurgy Oxide Sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences chemistry.chemical_compound Thermal conductivity chemistry Electrical resistivity and conductivity visual_art 0103 physical sciences Thermal Materials Chemistry Ceramics and Composites Silicon carbide visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology Order of magnitude |
| Zdroj: | Journal of the American Ceramic Society. 99:265-272 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.13958 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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