Carbothermic reduction of (UO3 + C) microspheres to (UO2 + C) microspheres

Developing uranium dicarbide–graphite porous materials for the SPES project

“…(9)). The lower temperatures observed in our case for reactions (8) and (9) as compared to the results of Poncet are in good agreement with those of Mukerjee [34], whose reaction condition are similar to those used in the present work and can be ascribed to the influence of dynamic high vacuum in the reaction chamber, that favors the reactions. The small release of CO 2 by the U 3 O 8 C sample at 200 < T < 400°C can be explained by the presence of a relatively small amount of UO 3 , as the XRD spectrum of commercial U 3 O 8 indicated.…”

“…As far as UO 3 C and U 3 O 8 C are considered, in apparent disagreement with the experimental results of Poncet et al [30] and Mukerjee [34], who proved that only CO 2 evolves during the carbothermic reduction of UO 3 , we observed a significant release of CO, in the case of sample UO 3 C, at 800°C, that is about 100°C above the end of the carbon dioxide production. A peak of lower intensity at 900°C is also present in the U 3 O 8 C and UO 2 C samples.…”

Production and Characterization Package of Reference and Advanced Feedstock

“…An example of the temperature profile used for the conversion is shown in Figure 6. The conversion process starts with a transition of UO3+C to UO2+C, a reaction which is completed at around 650°C [23]. Afterwards, in the temperature range of 1300°C-1500°C, UO2+C converts to UC [24].…”

Nitride fuel for Gen IV nuclear power systems

“…If carbon is already present in the system, as in the case of when gelation derived microspheres are being nitride for example, some carbon in the system can be lost as carbon monoxide due to oxidation by steam [ 56 ] …”