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- W2059227472 abstract "Abstract The sintering of UO2+x in oxidizing atmospheres was studied using a three-stage sintering process in order to obtain a large grain pellet from UO2 powder converted by conventional ADU. The three-stage process consists of sintering in reducing-oxidizing-reducing atmospheres at low temperatures between 1200 and 1500°C. After the sintering temperature was reached, the atmosphere was changed from a reducing to an oxidizing one in which the oxygen partial pressure was controlled to the maximum value corresponding to the boundary between the single-phase region UO2+x and the two-phase region UO2+x-U3O8−z. The densification and grain growth of UO2+x are enhanced by increasing the oxygen partial pressure. Air could be used above 1500°C. The O/U ratio of the sintered pellets was 2.000 ± 0.005 after reducing in the subsequent reducing atmosphere of H 2 N 2 (= 1 2 ) mixture for 1 h followed by cooling-down. The thermal dimensional changes during resintering at 1700°C of a UO2 pellet sintered in the three successive atmospheres of H2-CO2-H2 at 1400°C resulted in a moderate densification, whereas a large degree of swelling occurred in a pellet sintered in CO2-H2." @default.
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- W2059227472 date "1997-06-01" @default.
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- W2059227472 title "UO2 sintering in controlled oxygen atmospheres of three-stage process" @default.
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- W2059227472 doi "https://doi.org/10.1016/s0022-3115(96)00755-6" @default.
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