A Thermodynamic Approach of the Mechano-Chemical Coupling during the Oxidation of Uranium Dioxide

Nicolas Creton; Virgil Optasanu; Tony Montesin; Sébastien Garruchet; Lionel Desgranges

doi:10.4028/www.scientific.net/DDF.289-292.447

Paper Titles

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On the Mechanism of Cu₂O Oxidation at High Temperatures
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Studies of the Effectiveness of Certain High Performance Coatings in Preventing Hot Corrosion Degradation of Ti-Aluminide Alloys
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A Thermodynamic Approach of the Mechano-Chemical Coupling during the Oxidation of Uranium Dioxide
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Oxidation Behaviour of Stainles Steel Matrix with TiC and TiC+TiB₂ SHS Powders in a Thermal Spray Process
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Behaviour of Aluminide Diffusion Coatings on HCM12-A Steel by Al/Ce and Al/La CVD-FBR in Oxidation.
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The Influence of CVD-FBR Coatings on HCM12 Corrosion Behaviour under Molten Salt Conditions
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Metal Dusting Corrosion of 9Cr-1Mo Steel in Propane-Butane Gas Mixture
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A Thermodynamic Approach of the Mechano-Chemical Coupling during the Oxidation of Uranium Dioxide

Abstract:

The aim of the present work is to introduce a thermodynamic model to describe the growth of an oxide layer on a metallic substrate. More precisely, this paper offers a study of oxygen dissolution into a solid, and its consequences on the apparition of mechanical stresses. They strongly influence the oxidation processes and may be, in some materials, responsible for cracking. To realize this study, mechanical considerations are introduced into the classical diffusion laws. Simulations were made for the particular case of uranium dioxide, which undergoes the chemical fragmentation. According to our simulations, the hypothesis of a compression stress field into the oxidised UO2 compound near the internal interface is consistent with the interpretation of the mechanisms of oxidation observed experimentally.