Kinetics on carbothermic reduction of UO2+C powders and compacts to UC2.
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概要
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The rate for the carbothermic synthesis of UC<SUB>2</SUB> from UO<SUB>2</SUB>+ C powders and compacts was determined from the amount of CO gas released into flowing He. The reduction rate was found to be greatly influenced by the characteristics of oxide powders. For the UO<SUB>2</SUB> powder having a small particle size, the reaction at the UO<SUB>2</SUB>-UC<SUB>2</SUB> interface in every particle may control the reduction. For the powder of a large particle size, about 100 μm, the reduction was found to be controlled by the diffusion of oxygen through the carbide layer to the surface of the particle. The shape of compacted samples also influences the reduction behavior of UO<SUB>2</SUB>+ C mixtures to UC<SUB>2</SUB>. The reduction was controlled by the reaction at the interface between the produced UC<SUB>2</SUB>+C layer and the unreacted core in the sample compacted using the fine UO<SUB>2</SUB> powder at 80100 MPa. In the case of the sample compacted at 470 MPa, the reduction was controlled by the diffusion of CO gas from the interface of the compact through the UC<SUB>2</SUB>+C layer. The activation energy was estimated to be 350 to 405 kJ/mol for both of powder and compacted samples.
- 一般社団法人 日本原子力学会の論文
著者
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ARAI Yasuo
Japan Atomic Energy Agency
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SUZUKI Yasufumi
Japan Atomic Energy Research Institute
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Watanabe Hitoshi
Japan Atomic Energy Agency
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SASAYAMA Tatsuo
Japan Atomic Energy Research Institute
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