Oxidation kinetic analysis of a mixed URANIUM DICARBIDE (cas 12071-33-9) and graphite compound
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Add time:07/28/2019 Source:sciencedirect.com
The oxidation of a mixed URANIUM DICARBIDE (cas 12071-33-9) and graphite powder has been investigated by simultaneous thermal gravimetric (TGA) and differential thermal (DTA) analyses coupled with gas phase chromatography. For isothermal oxidation conditions with temperatures below 330 °C, only the UC2 chemical phase is progressively oxidised into U3O8 oxides. Parabolic weight gain curves as a function of oxidation over time were obtained. A detailed kinetic study is proposed to establish a pseudo-steady-state during the oxidation process. Using an experimental method based on the sudden temperature increases, a single rate-limiting step has been validated and then modelled by a 3D diffusion law. An apparent activation energy calculated from the Arrhenius representation has been evaluated at −35 kJ/mol, thus describing the diffusion of oxygen through the oxide layer.
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