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TEM/STEM observation of ZrC-coating layer for advanced high-temperature gas-cooled reactor fuel

革新的高温ガス炉燃料用ZrC及びPyC被覆層のTEM/STEM観察

相原 純 ; 植田 祥平   ; 安田 淳; 石橋 英春; 高山 智生; 沢 和弘; 本橋 嘉信*

Aihara, Jun; Ueta, Shohei; Yasuda, Atsushi; Ishibashi, Hideharu; Takayama, Tomoo; Sawa, Kazuhiro; Motohashi, Yoshinobu*

日本原子力研究開発機構は革新的高温ガス炉用燃料としてZrC被覆燃料粒子の開発を開始した。本報告はおもに、開発初期におけるZrCと当方性高密度熱分解炭素(PyC)被覆層の微細構造に焦点を当てたものである。ZrC層中の遊離炭素領域はZrC結晶粒界にc面が沿ったような構造をとっているようであった。特にこのような構造をとる遊離炭素層は、ZrC層の機械的強度に加えて核分裂生成物閉じ込め性能を損なうことが予測される。PyC被覆層は中距離秩序を持った非晶質構造をとっていた。

Japan Atomic Energy Agency (JAEA) has started to study and develop ZrC coated fuel particles for advanced high temperature gas cooled reactors. This paper mainly focuses on the microstructures of the ZrC and isotropic dense pyrolytic carbon (PyC) coating layer produced in the early stage of the project. The structure of free carbon region in the ZrC coating layer appears to be such that c-plane was along with the ZrC grain boundary. It appears that the existence of the free carbon phase, especially with such structure, deteriorates the fission product (FP) retention performance in addition to the mechanical strength of ZrC. The PyC coating layer appears to be a medium-range ordered amorphous structure.

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