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Article Dans Une Revue Journal of the European Ceramic Society Année : 2021

Direct sintering of UO2+x oxides prepared under hydrothermal conditions

J. Manaud
Renaud Podor
X. F Le Goff
Jérôme Maynadie
Nicolas Dacheux
Nicolas Clavier

Résumé

The sintering of uranium oxide powders prepared by hydrothermal conversion of oxalates was studied. A dilatometric study first showed that among the synthesis conditions, only the pH largely impacted the densification, notably through the powders morphology. Three samples (single crystals-pH = 1, microspheres-pH = 2 and nano-powders-pH = 8) were further selected to study their sintering behaviour. Densitometric and granulometric data then allowed establishing sintering maps. For single crystals and microspheres, densities above 96%TD were obtained at 1700°C. In contrast, only 2 to 8 hours at 1500°C were needed to yield comparable results for nano-powders. These observations confirm that the hydrothermal conversion of oxalates can be considered as a promising route for the synthesis of actinide oxides, which can subsequently be sintered directly.
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hal-03259275 , version 1 (14-06-2021)

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J. Manaud, Renaud Podor, X. F Le Goff, Jérôme Maynadie, Nicolas Dacheux, et al.. Direct sintering of UO2+x oxides prepared under hydrothermal conditions. Journal of the European Ceramic Society, 2021, 41 (13), pp.6697-6707. ⟨10.1016/j.jeurceramsoc.2021.06.006⟩. ⟨hal-03259275⟩
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