| Effect of Additive Composition on Thermal Conductivity of Liquid-Phase Sintered Silicon Carbide Ceramics |
| Young-Wook Kim |
| University of Seoul |
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Silicon carbide (SiC) is an important structural material due to its excellent wear resistance, corrosion resistance, oxidation resistance, and mechanical properties [1,2]. Various industrial applications of SiC ceramics such as substrate materials for semiconductor devices, heater and heater plates for semiconductor processing, and capsule materials for nuclear fuels take advantage of its excellent thermal conductivity as well as its other excellent properties.
One opportunity for further improvement in the thermal conductivity of SiC ceramics is the judicious selection of sintering additives. The objective of the present study is to investigate new, environmentally benign additive systems for improving the thermal conductivity of liquid-phase sintered (LPS)-SiC ceramics. In this paper, the followings has been investigated and suggested: (1) the influence of additive composition on the thermal conductivity of LPS-SiC using RE2O3 additives (RE=Y, La, Nd, Sm, Gd); (2) the effect of initial ¥á-phase content on the thermal conductivity of LPS-SiC ceramics using Y2O3-Sc2O3 additives; (3) the factors that reduce the thermal conductivity of SiC ceramics; and (4) the potential strategies for achieving high thermal conductivity in LPS-SiC ceramics [3]. Fig. 1 shows typical microstructure of a LPS-SiC ceramic with a thermal conductivity of 234 W/m•K.
Figure 1. Typical microstructure of the SiC specimen sintered with Y2O3-Sc2O3 additives.
References:
[1] Y.W. Kim, Y.S. Chun, T. Nishimura, M. Mitomo, and Y.H. Lee, Acta Mater. 55 (2007) 727.
[2] K.Y. Lim, Y.W. Kim, T. Nishimura, and W.S. Seo, J. Eur. Ceram. Soc. 33 (2013) 345.
[3] Y.W. Kim, K.Y. Lim, and W.S. Seo, J. Am. Ceram. Soc. 97 (2014) 923.
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| Acknowledgements : Acknowledgement: This research was supported by both a grant from the Fundamental R&D Program for Technology of World Premier Materials (WPM) funded by the Ministry of Trade, Industry and Energy and by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning, Republic of Korea (2012R1A2A2A01004284). |
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