Etude de la mise en forme en forme des combustibles céramiques nucléaires par le procédé de coulage-gélification : application à l'oxyde de cérium et à des systèmes à base d'uranium

Abstract : This work falls within the framework of the reprocessing-recycling of 4th Generation nuclear used fuels. This work was focused on nuclear fuel shaping process by studying more specifically the potential of gelcasting process. This study first examined a non-radioactive surrogate of mixed oxide (U,Pu)O2, namely the cerium oxide CeO2. Suspension formulations have been identified allowing gelation in non-porous molds. This gelling process is based on polymerization reactions. The study of green compacts thermal behavior has allowed to define treatments leading to the complete elimination of every organic auxiliaries and to the green compacts densification. Every step of the gelcasting process was optimized to elaborate annular shape CeO2 ceramics meeting the specification.The whole gelcasting process has been transposed to a mixed oxide (U,Ce)O2 powder synthesized by oxalic co-precipitation. To this end, powder characteristics have been taken in consideration and have required an additional deagglomeration step.
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Séverin Chaigne. Etude de la mise en forme en forme des combustibles céramiques nucléaires par le procédé de coulage-gélification : application à l'oxyde de cérium et à des systèmes à base d'uranium. Matériaux. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0083⟩. ⟨tel-02362583⟩

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