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Article Dans Une Revue Journal of the European Ceramic Society Année : 2009

On the origin of the sigmoid shape in the UO2 oxidation weight gain curves

Résumé

Cracking and spalling are known to occur during the oxidation of UO2. However, these phenomena are not considered by the existing kinetic models of the oxidation of UO2 into U3O8. In this study the oxidation of UO2 samples of various sizes from the single crystal to nanopowders, has been followed by isothermal and isobaric thermogravimetry, environmental scanning electron microscopy and in situ X-ray diffraction at temperatures ranging from 250 to 370°C in air. It has been shown that cracking occurs once a critical layer thickness of intermediate oxide has been reached, which corresponds to the beginning of the sigmoid kinetic curve. Cracking contribution to the sigmoid kinetic curve is then discussed as a function of temperature, and on the basis of nucleation and growth processes.
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Dates et versions

hal-00439251 , version 1 (07-12-2009)
hal-00439251 , version 2 (04-06-2010)

Identifiants

Citer

Ludovic Quémard, Lionel Desgranges, Vincent Bouineau, Michèle Pijolat, G. Baldinozzi, et al.. On the origin of the sigmoid shape in the UO2 oxidation weight gain curves. Journal of the European Ceramic Society, 2009, 29 (13), pp.2791-2798. ⟨10.1016/j.jeurceramsoc.2009.04.010⟩. ⟨hal-00439251v2⟩
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