Research on Superficial Passivation and Oxidation Characteristic of UD₃

The superficial passivation and oxidation characteristics of UD₃ were researched in this paper. The passivated UD₃ was analyzed by XRD and Raman measurements, and it was found that the protective layer of the passivated UD₃ is mainly UO₂. The oxidized characteristic of the passivated UD₃ was performed in a thermal analyser in the air. The ignition didn’t occur at room temperature. When the reaction temperature is lower than 110 ℃, the passivated UD₃ reacts slowly in the air. When the reaction temperature is higher than 130 ℃, the protective layer of the passivated UD₃ is damaged, and the UD₃ reacts violently in the air. The ignition occurrs at about 140 ℃.