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Développement d’outils numériques pour la sélection et l’optimisation de matériaux conducteurs mixtes pour l’oxycombustion

Abstract : Mixed Conductors (MIECs) are promising membrane materials for oxygen separating from air at high temperature. The oxygen semi-Permeation is the most important property of the membrane. This property induces a chemical potential gradient, which is the origin of some membrane ruptures. Forecasting gradients in service and the knowledge of MIECs mechanical properties are necessary for predict the reliability of future power plants. While the diffusion is well described by the Wagner theory, no consensus has yet emerged regarding the surface exchange models proposed in the literature. Furthermore, these models describe the stationary state, and cannot be extended to the transient stage. In this thesis, a new surface exchange model is proposed. This model takes into account the association/dissociation of oxygen and the high energetic cost of oxygen reduction/oxidation thanks to the balance of a transient species only present at the surface. This model can reproduce stationary state and transient stage. In parallel, a test device for characterizing the mechanical properties of the MIECs has been developed at 900 ° C. The test is “pseudo-Brazilian test” instrumented by an optical measurement. Post-Processing is carried out by a "Integrated Digital Image Correlation" method. The elastic properties of seven mixed conductors have been characterized.
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Camille Gazeau. Développement d’outils numériques pour la sélection et l’optimisation de matériaux conducteurs mixtes pour l’oxycombustion. Autre. Université d'Orléans, 2014. Français. ⟨NNT : 2014ORLE2031⟩. ⟨tel-02918007⟩

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