Direct sintering of UO2+x oxides prepared under hydrothermal conditions
| Autor: | Jérôme Maynadié, Nicolas Clavier, Nicolas Dacheux, Jérémie Manaud, Xavier Le Goff, Renaud Podor |
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| Přispěvatelé: | Interfaces de Matériaux en Evolution (LIME), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Etude de la Matière en Mode Environnemental (L2ME), Systèmes HYbrides pour la Séparation (LHyS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2021 |
| Předmět: |
Morphology (linguistics)
Materials science Sintering 02 engineering and technology [CHIM.INOR]Chemical Sciences/Inorganic chemistry 01 natural sciences Hydrothermal circulation chemistry.chemical_compound 0103 physical sciences Materials Chemistry Hydrothermal synthesis Uranium oxide Microstructure 010302 applied physics [CHIM.MATE]Chemical Sciences/Material chemistry Actinide Sintering map 021001 nanoscience & nanotechnology chemistry Yield (chemistry) Dilatometry Ceramics and Composites 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, Elsevier, In press, ⟨10.1016/j.jeurceramsoc.2021.06.006⟩ Journal of the European Ceramic Society, 2021, 41 (13), pp.6697-6707. ⟨10.1016/j.jeurceramsoc.2021.06.006⟩ |
| ISSN: | 0955-2219 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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