Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Deposition Temperature on Microstructure and Hardness of ZrC Coating Layers of TRISO-Coated Particles Fabricated by the FBCVD Method

유동층 화학기상증착법으로 제조된 TRISO 피복입자의 ZrC 층 미세구조와 경도에 미치는 증착온도의 영향

  • Ko, Myung-Jin (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Kim, Daejong (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Kim, Weon-Ju (Nuclear Materials Division, Korea Atomic Energy Research Institute) ;
  • Cho, Moon Sung (HTGR Fuel Technology Development Division, Korea Atomic Energy Research Institute) ;
  • Yoon, Soon Gil (Department of Materials Science and Engineering, Chungnam National University) ;
  • Park, Ji Yeon (Nuclear Materials Division, Korea Atomic Energy Research Institute)
  • 고명진 (한국원자력연구원 원자력재료개발부) ;
  • 김대종 (한국원자력연구원 원자력재료개발부) ;
  • 김원주 (한국원자력연구원 원자력재료개발부) ;
  • 조문성 (한국원자력연구원 차세대핵연료개발부) ;
  • 윤순길 (충남대학교 재료공학과) ;
  • 박지연 (한국원자력연구원 원자력재료개발부)
  • Received : 2012.11.01
  • Accepted : 2012.11.27
  • Published : 2013.01.31
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Abstract

Tristructural-isotropic (TRISO)-coated particles were fabricated by a fluidized-bed chemical vapor deposition (FBCVD) method for use in a very high temperature gas-cooled reactor (VHTR). ZrC as a constituent layer of TRISO coating layers was deposited by a chloride process using $ZrCl_4$ and $CH_4$ source gases in a temperature range of $1400^{\circ}C$ and $1550^{\circ}C$. The change in the microstructure of ZrC depending on the deposition temperature and its effect on the hardness were evaluated. As the deposition temperature increased to $1500^{\circ}C$, the grain size of the ZrC increased and the hardness of the ZrC decreased according to the Hall-Petch relationship. However, at $1550^{\circ}C$, the ZrC layer was highly non-stoichiometric and carbon-rich and did not obey the Hall-Petch relationship in spite of the decrease of the grain size. A considerable amount of pyrolytic carbon at the grain boundaries of the ZrC as well as coarse granular pyrolytic carbon were locally distributed in the ZrC layer deposited at $1550^{\circ}C$. Therefore, the hardness decreased largely due to the formation of a large amount of pyrolytic carbon in the ZrC layer.

Keywords

References

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