Low-temperature sintering(LTS)experiments of UO2 pellets and their results were reported.Moreover,a routine process of LTS for UO2 pellets was primarily established.Being sintered at 1 400 ℃ for 3 h in a partially-ox...Low-temperature sintering(LTS)experiments of UO2 pellets and their results were reported.Moreover,a routine process of LTS for UO2 pellets was primarily established.Being sintered at 1 400 ℃ for 3 h in a partially-oxidative atmosphere,the relative density of the pellet can be up to around 94%.Pellets with such a high density are of benefit for following-up reduction-sintering processes.Orthogonal test indicates that the importance of factors affecting the density decreases in the sequence of partial-oxidative sintering temperature and time,reduction-sintering time and temperature,and sintering atmosphere.It is found that it is helpful to introducing a small amount of water vapor into the sintering atmosphere during the latter stage.It is believed that it is the key factor to raise the O/U ratio of original powder in order to improve the properties of the low-temperature sintered pellets.展开更多
文摘Low-temperature sintering(LTS)experiments of UO2 pellets and their results were reported.Moreover,a routine process of LTS for UO2 pellets was primarily established.Being sintered at 1 400 ℃ for 3 h in a partially-oxidative atmosphere,the relative density of the pellet can be up to around 94%.Pellets with such a high density are of benefit for following-up reduction-sintering processes.Orthogonal test indicates that the importance of factors affecting the density decreases in the sequence of partial-oxidative sintering temperature and time,reduction-sintering time and temperature,and sintering atmosphere.It is found that it is helpful to introducing a small amount of water vapor into the sintering atmosphere during the latter stage.It is believed that it is the key factor to raise the O/U ratio of original powder in order to improve the properties of the low-temperature sintered pellets.
