Application of defect model to UO2+x pellets in low temperature sintering
Low temperature sintering of UO2+x pellets was researched in this paper. 12 groups pellets were sintered in vertical molybdenum wire furnace with N2+CO2 partially-oxidative atmosphere. Properties such as density and O/U ratio of the sintering pellets were analyzed. A defect model of hyper-stoichiometric uranium dioxide was established for studying the active mechanism. The sintering temperature and sintered densities of UO2+x pellets were predicted by the model. The results show that the sintering pellets with 10.41g/cm3 density could be obtained at 1673K. The diffusion coefficient of uranium ions was positive to partial pressure of oxygen (Po2) or excess oxygen ions (x in UO2+x). The calculated sintered density and sintering temperature of UO2+x in partially-oxidative atmosphere were agreed to experimental results very well.
hyper-stoichiometric uranium dioxide low temperature sintering diffusion coefficient sintering temperature sintered density
LI Rui GAO Jia-cheng
College of Materials Science and Engineering, Chongqing University,Chongqing, 400030, China Reactor College of Materials Science and Engineering, Chongqing University,Chongqing, 400030, China
国内会议
长沙
英文
1-9
2010-06-19（万方平台首次上网日期，不代表论文的发表时间）