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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 1    January 2008

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Low-temperature sintering process for UO2 pellets in partially-oxidative atmosphere
YANG Xiao-dong(杨晓东)1, 2, GAO Jia-cheng(高家诚)1, WANG Yong(王 勇)1, CHANG Xin(畅 欣)2

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. Yibin Nuclear Fuel Element Plant, Yibin 644000, China

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.

 

Key words: UO2 pellet; low-temperature sintering; sintering temperature; sintering time

ISSN 1672-7029
CN 43-1423/U

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