报道了UO2+x芯块低温烧结实验的结果.12组芯块在N2+CO2组成的部分氧化气氛下于立式钼丝炉中低温烧结.UO2芯块要获得密度为10.41g/cm3(94.98％理论密度)需在氢气氛中于2073～2273K下烧结,而UO2+x芯块实现该密度的烧结温度可降低400K以上.建立了超氧化铀缺陷模型来研究低温烧结的活化机理.研究发现铀离子扩散系数与气氛中氧分压或是UO2+x中x成正比.利用铀离子的扩散系数,可预测UO2+x芯块在1073、1273、1473和1673K温度下的烧结密度；还可算出x=0.04时,UO2+x芯块在部分氧化气氛下的理论烧成温度.计算所得烧结密度和烧成温度与实验结果符合得很好.
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