Abstract
Rate‐controlling factors in the conversion of UO2+ C microspheres to UC2+ C were investigated using a fluidized‐bed furnace (13 cm in diam.). Examination by X‐ray diffraction, ion microprobe, and microstructural observation revealed that the conversion of UO2 to UC2 began at the surface of the microsphere and progressed toward the central unreacted core. Kinetic models for solid state reactions in spheres were evaluated by using quantitative mass spectrometric data on the rate of evolution of CO during conversion. This analysis revealed that the rate of conversion was controlled by reaction at the outer surface of the microsphere. Also, decreased partial pressures of CO accelerated the rate of reaction.
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