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Communication Dans Un Congrès Année : 2005

Kinetics of High Temperature Oxidation and of Chromia Volatilization for Chromium Carbides-containing Alloys

Résumé

Resistance of superalloys against several contraints (mechanical deformation, corrosion by molten salts or glasses, oxidation…) -> external stoechiometric oxide layer Al2O3: efficient against oxidation, Cr2O3: efficient against oxidation and corrosion Cr2O3 + 3/2 O2 -> 2 CrO3 (gaseous): Problem of chromia volatilization when T > 1000°C : the real damage supported by the material can be minimized Superalloys strenghtened with carbides are often chromia-forming: Necessity to precise both oxidation and chromia volatilization rates for T > 1000°C xidation of superalloys: Oxidation of Ni30CrxC alloys follows a parabolic law; Oxidation rate depends on carbon content: Kp and Kv increase with %wtC New mathematical model to determine Kp and Kv: * Drawing mdm/dt versus –m allows to determine directly both Kp and Kv * Kp and Kv values were verified twice. They describe the real HT phenomenon.
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Dates et versions

hal-04190649 , version 1 (29-08-2023)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : hal-04190649 , version 1

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P Berthod, L Aranda, S Abdelouhab, R Podor, C Rapin. Kinetics of High Temperature Oxidation and of Chromia Volatilization for Chromium Carbides-containing Alloys. 2015 European Corrosion Congress (Eurocorr 2005), Sep 2005, Lisbonne, Portugal. ⟨hal-04190649⟩
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