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Published on: May 12, 2012
Low-Temperature Oxidation of Fine UO2 Powders: Thermochemistry and Kinetics
Gregory Leinders1, Thomas Cardinaels1,2, Koen Binnemans2
1Belgian Nuclear Research Centre (SCK·CEN) , Institute for Nuclear Materials Science , Boeretang 200 , B-2400 Mol , Belgium.
Abstract:
The thermochemical behavior of low-temperature oxidation in fine UO2 powders has been investigated by simultaneous thermogravimetric analysis and differential scanning calorimetry. The evaluation of the thermochemical and kinetic data reveals a complex interplay between different mechanisms. The initial reaction concerns the rapid chemisorption of oxygen gas onto the surface of UO2 grains, having an activation energy of only 13.1 ± 0.6 kJ mol-1. The subsequent oxidation at temperatures between 40 and 100 °C occurs first at the surface via a field-assisted mechanism, which progresses via domain growth into the bulk. At more elevated temperatures, thermally activated diffusion becomes the dominant mechanism.
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