Thermal conductivity of liquid-phase sintered silicon carbide ceramics: A review |
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| Affiliation: | 1. Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea;1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2. Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. College of Aerospace Engineering, Chongqing University, Chongqing 400030, China;1. August Chełkowski Institute of Physics, University of Silesia in Katowice, ul. 75 Pułku Piechoty 1, 41–500 Chorzów, Poland;2. Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics, Vilnius University, Saulėtekio av. 3, LT-10257 Vilnius, Lithuania;3. Institute of Materials Engineering, University of Silesia in Katowice, ul. 75 Pułku Piechoty 1, 41–500 Chorzów, Poland;4. Department of Physics, Faculty of Science, University of Hradec Králové, Hradec Králové, Czech Republic;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia |
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| Abstract: | Silicon carbide (SiC) exhibits excellent thermal conductivity. Recently, thermal conductivity that amounts to 261.5 W/m-K has been obtained in polycrystalline SiC ceramic liquid-phase sintered (LPS) with Y2O3-Sc2O3 additives at 2050 °C under a nitrogen atmosphere. From the additive used to the sintering atmosphere selected, many factors affect the thermal conductivity of the SiC. In this review, important factors that are known to determine the thermal conductivity of LPS-SiC (lattice oxygen/nitrogen content, porosity, grain size, grain boundary structure, phase transformation, and additive composition) have been evaluated. While reviewing the impact of each factor on thermal conductivity, hidden correlations among different factors are also discussed. Among the factors that are claimed to be important, we suggest a few factors that are more critical to thermal conductivity than others. Based on the most critical factors on the thermal conductivity of LPS-SiC, a complete engineers’ guide for high thermal conductivity LPS-SiC is proposed. |
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| Keywords: | Silicon carbide Thermal conductivity Liquid-phase sintering Additive composition Phonon |
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