摘要
研究烧结温度和Th含量对(Th,U)O2芯块密度的影响,计算不同Th含量的(Th,U)O2芯块烧结活化能,通过扫描电镜(SEM)分析(Th,U)O2芯块中气孔的变化迁移过程。结果表明:在相同烧结温度下,(Th,U)O2芯块密度随Th含量的增大而降低;随烧结温度升高,芯块密度增大,在此过程中存在一个使芯块快速致密化的烧结势垒温度;(Th,U)O2芯块烧结活化能随Th含量的增大而增大,Th含量(摩尔分数)为20%、50%、80%的(Th,U)O2芯块的烧结活化能分别为277.65、300.70、380.99 k J/mol;在Th含量为20%的(Th,U)O2芯块中,气孔呈球形分布于晶界交汇处。
This paper studies the effects of sintering temperature and thorium content On the density of （Th,U）O2 pellets. The activation energy for sintering （Th,U）O2 pellets were calculated, the movement and transplantation were analyzed by using Scanning Electron Microscope（SEM）. The results show that the density of （Th,U）O2 pellets decrease as the proportion of thorium increase when sintering temperature is constant. The density of pellets increase as the sintering temperature increase. The activation energy for sintering （Th,U）O2 pellets increase as the proportion of thorium increase. When the proportion of thorium were 20%, 50%,80%, the activation energy for sintering （Th,U）O2 pellets were 277.65 kJ/mol, 300.70 kJ/mol, 380.99 kJ/mol respectively. The pores in the （Th,U）O2 pellets which the proportion of thoriumwas 20% were mainly at the junction of grain boundary, and most of the pores were spherical.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2014年第6期41-44,共4页
Nuclear Power Engineering
