公开(公告)号：US20120098149A1

公开(公告)日：2012-04-26

申请号：US13275784

申请日：2011-10-18

申请人： JAE-HO YANG ,  Keon-Sik Kim ,  Kun-Woo Song ,  Jong-Hun Kim ,  Young-Woo Rhee ,  Dong-Joo Kim ,  Chill-Sun Ryu

发明人： JAE-HO YANG ,  Keon-Sik Kim ,  Kun-Woo Song ,  Jong-Hun Kim ,  Young-Woo Rhee ,  Dong-Joo Kim ,  Chill-Sun Ryu

IPC分类号： G21C21/00

CPC分类号： G21C21/02 ,  G21C3/62 ,  G21C3/623 ,  Y02E30/38

摘要： Provided are a method of controlling the compositional gradient and solubility of doped-additives at grain boundaries during sintering of a uranium-based oxide green pellet including the additives, and a method of manufacturing a sintered nuclear fuel pellet having a large grain size using the same. The grain boundary solubility of the doped-additives is maintained at a certain level by stepwise varying of an oxygen partial pressure during isothermal sintering of a uranium-based oxide green pellet including the additives. The method of manufacturing a sintered nuclear fuel pellet having a large grain size includes preparing additive mixed uranium oxide powder, forming an additive mixed uranium oxide green pellet using the mixed powder, heating the green pellet to a sintering temperature in a gas atmosphere having a low oxygen partial pressure, and sintering while a sintering gas atmosphere is changed to stepwise increase an oxygen partial pressure at the isothermal sintering temperature.

摘要翻译： 提供一种在包含添加剂的铀基氧化物生颗粒的烧结期间控制掺杂添加剂在晶界处的组成梯度和溶解度的方法，以及使用其制备具有大晶粒尺寸的烧结核燃料芯片的方法 。 掺杂添加剂的晶界溶解度通过在包括添加剂的铀基氧化物生颗粒的等温烧结期间逐步改变氧分压而保持在一定水平。 制造具有大粒径的烧结核燃料颗粒的方法包括制备添加剂混合氧化铀粉末，使用混合粉末形成添加剂混合的氧化铀颗粒，将生坯颗粒加热至低浓度的气体气氛中的烧结温度 氧分压和烧结，同时烧结气氛改变为在等温烧结温度下逐步增加氧分压。