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Etude du comportement de revêtements multicouches multifonctionnels à haute température

Abstract : The context of this thesis is the study of structural materials for solar receivers in central receiver system. The Ni-based superalloys, the alloys based on Fe-Cr-Al, and the alloys based on Mo-Si-Al seems to be the best candidate to be used at high temperature for this application, because their mechanical properties and their oxidation resistance above 1000 K are very good. However a coating is necessary in order to optimize the radiative properties, which is an essential criterion. This work has thus two objectives. First as received and coated with ceramic (AlN and/or SiC) alloy samples are oxidized to study their behavior, and to study the hold of the ceramic on various substrates. For that purpose, an electrical muffle furnace and a solar reactor (REHPTS) were used, and various characterization techniques (XRD, SEM, EDS, Raman, and XPS) have allowed to determine the oxidation resistance. The second aim is to measure the radiative properties of the materials, and to characterize the impact of the oxidation and the temperature on these properties.
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Submitted on : Tuesday, February 25, 2020 - 11:58:25 AM
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  • HAL Id : tel-02490576, version 1



Johann Colas. Etude du comportement de revêtements multicouches multifonctionnels à haute température. Matériaux. Université de Perpignan, 2019. Français. ⟨NNT : 2019PERP0030⟩. ⟨tel-02490576⟩



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