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Effect of oxygen potential on sintering behavior of CeO$$_{2}$$

CeO$$_{2}$$の焼結挙動に対する酸素ポテンシャルの効果

渡部 雅  ; 田中 康介  ; 加藤 正人   

Watanabe, Masashi; Tanaka, Kosuke; Kato, Masato

本研究では、低酸素ポテンシャル下での焼結挙動を考察するために、核燃料の模擬材料として広く使用されているCeO$$_{2}$$の焼結挙動を様々な酸素分圧下で熱機械分析装置を用いて調べた。その結果、空気雰囲気と酸素分圧制御雰囲気ではペレット収縮挙動が大きく異なることがわかった。また、ペレットの収縮はP$$_{H2}$$/P$$_{H2O}$$比の増加に伴い低温側から開始した。このような関係は、PuO$$_{2}$$の収縮挙動と類似しており、CeO$$_{2}$$とPuO$$_{2}$$の焼結メカニズムは同一であることが示唆された。

In this study, the shrinkage behavior of CeO$$_{2}$$, which is widely used in surrogate material of the nuclear fuel, were studied using a thermomechanical analyzer in various oxygen partial pressure, to discuss the sintering mechanisms under the low oxygen potentials. The shrinkage ratios were significantly different between the air atmosphere and the oxygen partial pressure controlled atmosphere. The shrinkage began at lower temperature with increasing P$$_{H2}$$/P$$_{H2O}$$ ratio. The relationship between P$$_{H2}$$/P$$_{H2O}$$ ratio and shrinkage ratio in the sintering process of PuO$$_{2}$$ is similar to the result of this study. Therefore, it seems that both have the same sintering mechanism.

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