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Effects of H$$_{2}$$/H$$_{2}$$O ratio in the sintering atmosphere on the sintering behavior of MOX pellets

MOX燃料の焼結挙動に及ぼす焼結雰囲気中のH$$_{2}$$/H$$_{2}$$O比の影響

武内 健太郎 ; 加藤 正人  ; 砂押 剛雄*

Takeuchi, Kentaro; Kato, Masato; Sunaoshi, Takeo*

焼結雰囲気中のH$$_{2}$$/H$$_{2}$$O比をパラメータとして焼結中のMOXペレットのO/M変化と収縮率を測定し、焼結雰囲気中の酸素分圧が焼結挙動に与える影響を評価した。焼結中の試料のO/Mは焼結雰囲気中の酸素ポテンシャルと平衡となるO/Mに近づくように変化し、H$$_{2}$$/H$$_{2}$$O比が小さいほど試料のO/Mが高くなるとともに低温側で収縮が進む傾向を示した。試料の収縮速度は、1000$$sim$$1300$$^{circ}$$Cと1400$$sim$$1600$$^{circ}$$Cの2つの温度領域でピークを示し、H$$_{2}$$/H$$_{2}$$O比が小さな試料では、低温領域で収縮速度が大きくなった。この結果から、焼結中のO/Mが高い試料は低温領域で、O/Mの低い試料は高温領域で焼結過程がおもに進んでおり、両温度領域における焼結は異なったメカニズムで支配されているものと考えられる。H$$_{2}$$/H$$_{2}$$O比一定の雰囲気でMOXを焼結するとO/Mが変化しながら焼結が進み、H$$_{2}$$/H$$_{2}$$O比に依存して焼結特性が大きく変化することを確認した。

The effect of the O/M ratio on the sintering behavior of MOX pellets was evaluated from the measurement results of O/M ratio and shrinkage ratio of pellets during the sintering process. Change of O/M ratio was caused by approaching the equilibrium condition which was decided from oxygen potential depending on the H$$_{2}$$/H$$_{2}$$O ratio in the sintering atmosphere. The lower the H$$_{2}$$/H$$_{2}$$O ratio, the more shrinkage of pellets proceeded at lower temperatures and higher O/M values. The curves of shrinkage rate were observed to have two peaks at 1000 to 1300$$^{circ}$$C and 1400 to 1600$$^{circ}$$C. The shrinkage in the lower temperature range increased with decreasing the H$$_{2}$$/H$$_{2}$$O ratio. These results suggested that different mechanisms dominate the sintering behavior at each temperature range. It was confirmed that the sintering behavior of MOX pellet depends on H$$_{2}$$/H$$_{2}$$O ratio and changes significantly with O/M ratio.

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