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1. 发明授权

US06878313B2 Method of fabricating sintered nuclear fuel compact 失效
标题翻译：制造烧结核燃料压块的方法
公开(公告)号：US06878313B2
公开(公告)日：2005-04-12
申请号：US10219724
申请日：2002-08-15
申请人： Shin-ichi Kobayashi , Katsuo Fukumoto
发明人： Shin-ichi Kobayashi , Katsuo Fukumoto
IPC分类号： G06F9/44 , G21C3/62 , G21C21/00 , C04B33/32
CPC分类号： G21C21/00 , G21C3/623 , Y02E30/38
摘要： To furnish stably a sintered nuclear fuel compact of uranium dioxide with a large grain diameter, a fabrication method therefor requires sintering a starting material at two stages in an oxidizing atmosphere and in a reducing atmosphere at relatively low temperatures. The starting material is either a powder mixture of uranium dioxide fresh material powder and triuranium octaoxide in a weight ratio of 75/25 ˜ 55/45 or pulverulent mixed uranium oxides yielding a final O/U ratio equal to that of the powder mixture. The sintering process in the oxidizing atmosphere involves at least one time period of a temperature rise to a higher temperature of 1200 to 1100° C. and at least one time period of a temperature drop to a lower temperature of up to 1080° C. A temperature difference between the higher and lower temperatures is preferred to be 50° C. or more.
摘要翻译：为了稳定地提供具有大粒径的二氧化铀烧结核燃料压块，其制造方法需要在氧化气氛中和在较低温度下的还原气氛中在两个阶段烧结原料。起始原料是二氧化铀新鲜材料粉末和三重态三氧化铀的重量比为75/25〜55/45的粉末混合物或粉末混合铀氧化物，得到与粉末混合物相同的最终O / U比。在氧化气氛中的烧结过程包括至少一个温度升高到1200至1100℃的较高温度的时间段和至少一个温度下降到最高1080摄氏度的较低温度的时间段。较高和较低温度之间的温度差优选为50℃或更高。

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