Abstract
Oxidation of U-Zr alloys (10 to 90 at% Zr) in air was studied thermogravimetrically under isothermal as well as nonisothermal modes of heating. Increase in zirconium concentration led to decrease in reactivity with air. Based on the chemical analyses of the intermediate products, there appears to be a slight preferential oxidation of uranium in the matrix during the initial stages of the oxidation. The analysis of the intermediates by XRD indicated the formation of solid solution of UO 2 and ZrO 2. Kinetic parameters were evaluated for the oxidation reactions and the mechanism of the process is suggested.
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