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Influence of O/M ratio on sintering behavior of (U$$_{0.8}$$,Pu$$_{0.2}$$)O$$_{2pm x}$$

(U$$_{0.8}$$,Pu$$_{0.2}$$)O$$_{2pm x}$$の焼結挙動へのO/M比の影響

武内 健太郎 ; 加藤 正人  ; 砂押 剛雄*

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

熱天秤及び熱膨張計を用いて焼結中のMOXペレットのO/M比及び収縮率を測定し、MOXペレットの焼結挙動を評価した。試料にはPu富化度を20wt%に調整したMH-MOX粉末をダイ潤滑法で成型した試料を用い、雰囲気中の水素水分比をパラメータとして等速度昇温試験及び等温保持試験を行った。等速度昇温試験では、水素水分比の減少に伴って収縮速度及びO/M比が増加した。等温保持試験では、O/M比1.98から2.0005の範囲で試験を実施した。得られた結果は式(1)を用いて解析し、焼結メカニズムに関連する定数nを評価した。y=($$Delta$$$$L$$/$$L$$$$_{0}$$)=$$K$$($$T$$)$$^{n}$$ $$t$$$$^{n}$$, (1)解析結果から、MOXペレットの焼結はO/M及び温度によってそのメカニズムが変化することを確認した。

The sintering behavior of MOX pellets was investigated by thermal gravimetry and thermal dilatometry. The starting material was prepared by the microwave direct heating de-nitration method, in which the Pu/(Pu+U) ratio was controlled to 20% in the nitrate solution. The powder was pressed into sample pellets by the die wall lubrication method. The two kind of test, the constant heating rate test and the isochronal heating test, were carried out in various sintering atmospheres of $$P$$$$_{H_2}$$/$$P$$$$_{H_2O}$$ ratio. The results of the constant heating rate test showed that the shrinkage rate and O/M ratio increased with decreasing the $$P$$$$_{H_2}$$/$$P$$$$_{H_2O}$$ ratio. The isochronal heating test was carried out in the O/M range of 1.98 - 2.0005, and the densification behavior of the pellets was analyzed by use of the equation; y = ($$Delta$$$$L$$/$$L$$$$_{0}$$) = $$K$$($$T$$)$$^{n}$$ $$t$$$$^{n}$$. The result showed that the sintering mechanisms varied with the O/M ratio and temperature.

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パーセンタイル:53.57

分野:Materials Science, Multidisciplinary

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