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Fonctionnement en oxydation de matériaux composites céramiques (CMC) dans des environnements aéronautiques

Abstract : Ceramic matrix composites are potential candidate to replace the nickel-based alloys in advanced aeronautic engines as in civilian ones. These composites display cracks due to their elaboration process but also due to mechanical loading in use. These matrix cracks become an extended network for oxygen diffusion, and cause the premature damage of the material. To avoid this process, composites with a sequenced self-healing matrix have been developed and investigated. To resume, the self-healing process consists to consume part of incoming oxygen by sealing the matrix cracks with an oxide phase. In this work, a SiC/[Si-B-C] composite is investigated and a multi-scale approach is used. In a first time, the oxidation rate of each constituent is evaluated and in a second, composite specimens are aged between 450 and 1000°C in different gas mixtures and total pressures. This approach is a good way to better understand the contribution of each element under oxidizing environment and thus the self-healing process.
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Florence Nualas. Fonctionnement en oxydation de matériaux composites céramiques (CMC) dans des environnements aéronautiques. Autre. Université Sciences et Technologies - Bordeaux I, 2013. Français. ⟨NNT : 2013BOR14956⟩. ⟨tel-00993488⟩

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