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Etude de la rhéologie de pâtes céramiques pour la mise en forme de combustible nucléaire par extrusion

Abstract : This work deals with the rheology of ceramic pastes, surrogate of MOX nuclear fuels (U,Pu)O2. The thesis falls in the scope of ongoing research towards innovative processing methods to produce nuclear fuels. Fuels that have been produced by powder pressing so far. A water-based formulation yielding defectless extrudates and mimicking a 30%at PuO2 fuel was engineered through the use of polymeric additives. The rheology of the paste was studied, followed by a characterization of the mechanical properties of extrudated and fired rods, in order to assess the feasibility of the process. Conventional capillary rheometry as well as an empirical model derived from ceramic extrusion, were combined to provide with satisfactory pressure predictions over wide operating conditions. Squeeze flow rheometry was also implemented to improve the formulation of pastes with adequate behaviour. Furthermore, it also enables a better control of the slipping conditions, as well as can enlighten liquid phase migration. As a conclusion of this work, the production of nuclear MOX fuels by extrusion seems a promising alternative, which would be worthy of further studies in the future.
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https://pastel.archives-ouvertes.fr/tel-03346284
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Submitted on : Thursday, September 16, 2021 - 11:23:10 AM
Last modification on : Wednesday, November 17, 2021 - 12:28:41 PM
Long-term archiving on: : Friday, December 17, 2021 - 6:47:58 PM

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  • HAL Id : tel-03346284, version 1

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Pierre-François Mougard-Camacho. Etude de la rhéologie de pâtes céramiques pour la mise en forme de combustible nucléaire par extrusion. Mécanique des matériaux [physics.class-ph]. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLM003⟩. ⟨tel-03346284⟩

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