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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >PREPARATION OF HOMOGENEOUS (TH0.8U0.2)O-2 PELLETS VIA COPRECIPITATION OF (TH,U)(C2O4)(2)CENTER-DOT-NH(2)O POWDERS
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PREPARATION OF HOMOGENEOUS (TH0.8U0.2)O-2 PELLETS VIA COPRECIPITATION OF (TH,U)(C2O4)(2)CENTER-DOT-NH(2)O POWDERS

机译：通过（TH，U）（C2O4）（2）CENTER-DOT-NH（2）O粉末的沉淀制备均相（TH0.8U0.2）O-2球

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摘要

Thorium and uranium dioxides form a complete series of solid solutions. The formation from the individual oxides can be performed only by extensive co-milling and reaction at high temperatures. in this study, we prepared 80% ThO2-20% UO2 via coprecipitation of the mixed oxalates from nitrate solutions using an excess of oxalic acid. The parameters which may effect the powder properties were investigated, such as oxalic acid and thorium concentrations, temperature and type of agitation. The specific surface of the oxalates and their derived oxides were measured. Among the precipitation parameters, temperature of 10 degrees C and mechanical stirring resulted in the highest surface area. The coprecipitated Th,U(IV) oxalate powders were decomposed at 350 degrees C, calcinated at 900 degrees C each for 24 h in air and were reduced during 2 h at 650 degrees C in H-2 atmosphere. X-ray diffraction resulted in a single-phase mixed oxide solid solution. The green densities of pellets made from these mixed oxides varied between 36 and 38% TD. Pellets were sintered in flowing CO2 at 1100 degrees C for 30 min and achieved 81% TD. (C) 1997 Elsevier Science B.V. [References: 8]
机译：ium和二氧化铀形成完整的固溶体系列。由单独的氧化物形成只能通过广泛的共同研磨和在高温下反应来进行。在这项研究中，我们通过使用过量的草酸从硝酸盐溶液中共沉淀混合草酸盐来制备80％ThO2-20％UO2。研究了可能影响粉末性能的参数，例如草酸和or的浓度，温度和搅拌类型。测量了草酸盐及其衍生的氧化物的比表面。在沉淀参数中，温度为10摄氏度和机械搅拌导致表面积最大。共沉淀的草酸Th，U（IV）草酸盐粉末在350摄氏度下分解，在900摄氏度的空气中煅烧24小时，然后在H-2气氛中在650摄氏度的2小时内还原。 X射线衍射得到单相混合氧化物固溶体。由这些混合氧化物制得的粒料的生密度在TD的36％至38％之间变化。将球粒在流动的CO2中于1100摄氏度下烧结30分钟，并获得81％的TD。 （C）1997 Elsevier Science B.V. [参考：8]

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