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http://dx.doi.org/10.4191/kcers.2013.50.1.37

Effect of Deposition Temperature on Microstructure and Hardness of ZrC Coating Layers of TRISO-Coated Particles Fabricated by the FBCVD Method  

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)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.1, 2013 , pp. 37-42 More about this Journal
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
TRISO coating; Zirconium carbide; Fluidized-bed chemical vapor deposition;
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Times Cited By KSCI : 1  (Citation Analysis)
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