抄録
The rate of the fluorination reaction of UC with fluorine to form UF6 has been studied in the temperature range between 240°and 300°C by following with a thermobalance the change in weight of the solid phase. The overall reaction takes place in two steps: In the first step, UC is rapidly converted to UF4, which, in the second step, fluorinates to UF6. During the first step, polymeric fluorocarbon is also produced and is found dispersed throughout the intermediate UF4 particles. At reaction temperatures below 270°C, the second step reaction roughly follows the linear law. At temperatures above 270°C, it comes to follow the parabolic law, presumably due to the formation of a compact layer of polymeric fluorocarbon on the surface of the particles. Analysis of the gaseous products using mass and infrared spectrophotometers revealed the formation of several kinds of lower fluorocarbons.
