Abstract
A system-level model combining heat and mass transport and chemical reaction is developed to study silicon-carbide-based uranium ceramic material processing. This process is based on pyrolysis and synthesis of a mixture of preceramic polymers and uranium oxide particles. Three key steps for polymer pyrolysis and one key reaction for uranium oxide and silicon carbide interaction are established for the processing. The mechanism of vapor species transport is described by introducing a driving force induced by both natural and forced convection. The effects of geometry of sample, driving force, and particle size and volume fraction of filler, uranium oxide, on the porosity evolution, species uniformity, and reaction rate of the sample are investigated.
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