Direct sintering of UO2+x oxides prepared under hydrothermal conditions

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,...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2021-10, Vol.41 (13), p.6697-6707
Main Authors: Manaud, Jérémie, Podor, Renaud, Le Goff, Xavier F., Maynadié, Jérôme, Dacheux, Nicolas, Clavier, Nicolas
Format: Article
Language:English
Subjects:
Chemical Sciences
Dilatometry
Hydrothermal synthesis
Inorganic chemistry
Material chemistry
Microstructure
Sintering map
Uranium oxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 2–8 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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2021.06.006