Author:
Zhong Yi,Gao Rui,Li Bingqing,Yang Zhenliang,Huang Qiqi,Wang Zhiyi,Duan Limei,Liu Xuxu,Chu Mingfu,Zhang Pengcheng,Bai Bin,Wang Yun,Cheng Liang,Yan Biaojie,Liu Tong,Li Rui
Abstract
Large grain UO2 is considered as an accident tolerant fuel with great application potential due to its competitive advantage of good fission gas retention. In this paper, the influence of preparation parameters such as sintering atmosphere, mixing process, powder pretreatment and grain growth additives on the grain size of UO2 is systematically studied. The result shows that the factors mentioned above have different effects on the grain size of UO2. The grain growth of UO2 pellet sintered in oxidizing atmosphere is better than those in reducing atmosphere. The wet mixing process has a significant advantage over the dry mixing process. In addition, the powder pretreatment has little effect on grain growth while the influence of additives plays the main role. Large grain UO2 pellets with uniform grain size up to 150 μm are successfully prepared. Finally, the thermo-physical properties of the pellets are investigated.
Funder
National Key Research and Development Program of China
Subject
Materials Science (miscellaneous)
Cited by
5 articles.
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