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J. Korean Ceram. Soc. > Volume 50(1); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(1): 37.
doi: https://doi.org/10.4191/kcers.2013.50.1.37
유동층 화학기상증착법으로 제조된 TRISO 피복입자의 ZrC 층 미세구조와 경도에 미치는 증착온도의 영향
고명진, 김대종, 김원주, 조문성1, 윤순길2, 박지연
한국원자력연구원 원자력재료개발부
1한국원자력연구원 차세대핵연료개발부
2충남대학교 재료공학과
Effect of Deposition Temperature on Microstructure and Hardness of ZrC Coating Layers of TRISO-Coated Particles Fabricated by the FBCVD Method
Myung-Jin Ko, Daejong Kim, Weon-Ju Kim, Moon Sung Cho1, Soon Gil Yoon2, Ji Yeon Park
Nuclear Materials Division, Korea Atomic Energy Research Institute
1HTGR Fuel Technology Development Division, Korea Atomic Energy Research Institute
2Department of Materials Science and Engineering, Chungnam National University
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.
Key words: TRISO coating, Zirconium carbide, Fluidized-bed chemical vapor deposition
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