Low-temperature sintering process for UO2 pellets in partially-oxidative atmosphere
来源期刊：中国有色金属学报(英文版)2008年第1期
论文作者：杨晓东 高家诚 王勇 畅欣
文章页码：171 - 177
Key words：UO2 pellet; low-temperature sintering; sintering temperature; sintering time
Abstract: 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.
