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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제46권 제1호
발행연도
2014.1
수록면
117 - 124 (8page)

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The effect of various process variables on the powder properties of recycled U3O8 from MnO-Al2O3 doped large grainUO2 pellets and the effect of those recycled U3O8 powders on the sintered density and grain size of MnO-Al2O3 doped largegrain UO2 pellets have been investigated. The evolution of morphology, size, and BET surface area of the recycled U3O8powders according to the respective variation of the thermo-mechanical treatment variables of oxidation temperature,powder milling, and sequential cyclic heat treatment of oxidation and then reduction was examined. The correlation betweenthe BET surface area of recycled U3O8 powder and the sintered pellet properties of MnO-Al2O3 doped pellets showed that thepellet density and grain size of doped pellets were increased and then saturated by increasing the BET surface area of therecycled U3O8 powder. The density and grain size of the pellets were maximized when the BET surface area of the recycledU3O8 powder was in the vicinity of 3m2/g. Among the process variables applied in this study, the cyclic heat treatmentfollowed by low temperature oxidation was a potential process combination to obtain the sinter-active U3O8 powder.

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