Étude de la sublimation du chrome lors de l’oxydation haute température de l’alliage AISI 441 et recherche de solutions de protection

Abstract : Ferritic stainless steels are the most attractive materials that are able to fulfil SOFC(Solid Oxide Fuel Cell) interconnect properties. However, in cathodic SOFC condition, Crvolatilisation from ferritic steels leads to degradations of interconnect and cathode materialsand shorter service lifetime of SOFC. The objectives of this work are (i) to study Crvolatilisation from AISI 441 ferritic stainless steel and (ii) to find the way out to suppress Crvolatilisation. The Cr volatilisation protective methods used in this work were coating withMn-Co spinel by an electroplating method and preoxidation in the condition of Ar or CO/CO2at either 250°C or 850°C, for 3 h. Cr volatilisation experiments were performed in 5%H2O inO2 at 800°C for 96 h. According to the results, it can be concluded that the preoxidation ofthe AISI 441 in Ar or CO/CO2 at low temperature (250°C) or in the CO/CO2 at a highertemperature (850°C) are treatments that lead to lowering the sublimation rate of the Cr andimprovement in the oxidation resistance of this alloy in the cathodic compartment of theSOFC.
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Wichitra Wongpromrat. Étude de la sublimation du chrome lors de l’oxydation haute température de l’alliage AISI 441 et recherche de solutions de protection. Matériaux. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI070⟩. ⟨tel-01259299⟩

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