Study on characterization of interaction layer of U-Mo/Al-2Si

U-Mo Alloy fuel is the most promising LEU fuel that used for research and test reactors. In this paper, the diffusion and reaction behavior of U-Mo/Al-2Si is studied with the hot-pressing diffusion-couple method. The experiment is carried out in a vacuum furnace for 550~570°C at 5~21 h. The result shows that the interaction layer thickness is increasing with temperature augmenting and time prolonging. Rich in Si layer is formed in the U-Mo side with 47.4 at.% Si. From U-Mo side to Al-2Si side, U (Mo) content is decreased while Al is increased, and Si is decreased after biggest content in U-Mo side. The phase of U-Mo side is mainly (U, Mo)(Al, Si)3, and Al side the phase is a mixture of (U, Mo)(Al, Si)3 and UMo2Al2. The amount of UMo2Al2 is increased from U-Mo side to Al-2Si side.