Abstract
The mechanism and kinetics of UN formation by reaction of a pellet of mixed UO2 and C with N2 were studied for temperatures of 1420° to 1750°C. The reaction followed the first‐order rate equation; the activation energy was 83 kcal/mol. Only UN1−xCx was produced. The lattice parameter variation of UN1−xCx had a minimum and a maximum during reaction; at the maximum, UN1−xCx+ C + N2 were in equilibrium. The overall reaction was divided into four stages: (1) formation of UN1−xCx from UO2, (2) decarburization of UN1−xCx, (3) formation of UN1−xCx with the equilibrium composition, and (4) pure UN formation. The lowest reaction rate was in stage (4).
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