The mechanism and kinetics of U2C3 formation by the synthetic reaction |
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Authors: | A Buschinelli A Naoumidis H Nickel |
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Affiliation: | Institut für Reaktorwerkstoffe Kernforschungsanlage Jülich GmbH, Fed. Rep. Germany |
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Abstract: | In fast breeder reactors it is planned to use the fuel in the form of (U, Pu)C with a slight carbon hyperstoichiometry. It is therefore important to know under what conditions the synthetic reaction occurs, since the hyperstoichiometric carbon, which exists as a uranium dicarbide phase (UC2) after manufacture, is to be converted to U2C3. The literature concerning the reaction conditions is partly contradictory. In this paper, the influence of thermal or mechanical pretreatments on the formation of U2C3 was investigated experimentally and is discussed in connection with other published data. It was found that the relative increase of the U2C3 nuclei density caused by grinding corresponds to the increase in surface of the ground material. A quantitative kinetic examination of the U2C3 formation was made and the activation energy for the synthetic reaction in powder was found to be kJ/mol. |
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