铌在铀熔体中的溶解扩散行为

Dissolution and Diffusion of Niobium in Uranium Melt

为了提高对固态铌在铀熔体中的溶解扩散的认识,对固态铌在铀熔体中的溶解扩散行为进行了研究。通过溶解扩散实验获得铌在铀熔体中的溶解速率v与熔体温度T存在v=0.3651exp(–21150/T)关系;对U/Nb溶解扩散界面进行了表征。结果显示,铌溶解于铀熔体的过程中,U/Nb溶解扩散界面形成了与固态Nb具有位向关系的片状结构;对比有/无电磁搅拌情况下铌在铀熔体中的溶解行为及U/Nb界面结构,表明电磁搅拌提高了铌在铀中的溶解速率并改变了U/Nb界面的片状结构。

The dissolution and diffusion of Nb in U melt was investigated using experimental method.The actual dissolution rate of Nb in U melt with different temperatures was obtained.The dissolution rate of Nb in U melt v and the melt temperature T have a relation of v=0.3651 exp(–21150/T).Scanning electron microscope observation shows that sheet structure forms at the U/Nb interface during the dissolution process of Nb in U melt.When electromagnetic stirring is used,the dissolution rate of Nb in U melt increases obviously and the morphology of sheet structure at the U/Nb interface changes.