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http://dx.doi.org/10.4191/kcers.2013.50.6.446

Microstructure of ZrC Coatings of TRISO Coated Particles by Codeposition of Free Carbon and Control of Stoichiometry  

Ko, Myung-Jin (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Kim, Daejong (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Park, Ji Yeon (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Cho, Moon Sung (HTGR Fuel Technology Development Division, Korea Atomic Energy Research Institute)
Kim, Weon-Ju (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.6, 2013 , pp. 446-450 More about this Journal
Abstract
TRISO coated particles with a ZrC barrier layer were fabricated by a fluidized-bed chemical vapor deposition (FBCVD) method for a use in a very high temperature gas-cooled reactor (VHTR). The ZrC layer was deposited by the reaction between $ZrCl_4$ and $CH_4$ gases at $1500^{\circ}C$ in an $Ar+H_2$ mixture gas. The amount of free carbon codeposited with in ZrC was changed by controlling the dilution gas ratio. Near-stoichiometric ZrC phase was also deposited when an impeller was employed to a $ZrCl_4$ vaporizer which effectively inhibited the agglomeration of $ZrCl_4$ powders during the deposition process. A near-stoichiometric ZrC coating layer had smooth surface while ZrC containing the free carbon had rough surface with tumulose structure. Surface roughness of ZrC increased further as the amount of free carbon increased.
Keywords
TRISO; VHTR; ZrC; Free carbon; Stoichiometry;
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