Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Fabrication and thermal conductivity of CeO2-Ce3Si2 composite

  • Ahn, Jungsu (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Gyeonghun (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Jung, Yunsong (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology) ;
  • Ahn, Sangjoon (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2020.01.31
  • Accepted : 2020.07.12
  • Published : 2021.02.25
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Abstract

Various compositions of CeO2-Ce3Si2 (0, 10, 30, 50, and 100 wt%Ce3Si2) composites were fabricated using conventional sintering and spark plasma sintering. Lower relative density, enhanced interdiffusion of oxygen and silicon, and silicide agglomerations from the congruent melting of Ce3Si2 at 1390 ℃ were only observed from conventionally-sintered pellets. Thermal conductivity of spark plasma sintered CeO2-Ce3Si2 composites was calculated from the measured thermal diffusivity, specific heat, and density, which exhibited dense (>90 %TD) and homogeneous microstructure. The composite with 50 wt%Ce3Si2 exhibited 55% higher thermal conductivity than CeO2 at 500 ℃, and 81% higher at 1000 ℃.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (No. NRF-2016R1A5A1013919).

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