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, Ce travail s'est focalisé sur l'étape de mise en forme du combustible en étudiant plus spécifiquement les potentialités du procédé de coulage-gélification. Cette étude a porté dans un premier temps sur un simulant non radioactif de l'oxyde mixte (U,Pu)O2, à savoir l'oxyde de cérium CeO2. Des formulations de suspensions ont été identifiés permettant leur gélification dans des moules non poreux, Ce travail se place dans le cadre du traitement-recyclage des combustibles usés pour des réacteurs nucléaires de Génération IV
, L'étude du comportement thermique des crus a permis de définir des traitements conduisant à l'élimination complète des auxiliaires organiques et à la densification quasi-complète des crus
, L'optimisation du procédé de coulage-gélification a permis d'élaborer des céramiques de CeO2 de forme annulaire répondant au cahier des charges des futurs combustibles
, L'ensemble du procédé de coulage-gélification a pu être transposé à une poudre d'oxyde mixte (U,Ce)O2 synthétisée par co-précipitation oxalique. Pour cela, les caractéristiques spécifiques de cette poudre ont été prises en compte et ont nécessité le recours à une étape de supplémentaire de désagglomération
, Mots-clefs : Oxyde de cérium, mise en forme, coulage-gélification, combustible nucléaire. Study of ceramic nuclear fuel shaping by gelcasting process. Application of cerium oxide and uranium-based systems