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Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature

Texier, Damien and Ecochard, Maxime and Gheno, Thomas and Monceau, Daniel and Salem, Mehdi and Lours, Philippe Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature. (2021) Corrosion Science, 184. 109334. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2021.109334

Abstract

The high temperature oxidation behavior of an APS processed γ–β NiCoCrAlY coating was investigated at 1150 °C. Ultrathin freestanding coating specimens ranging from 16 to 240 μm in thickness were tested for short-term oxidation time (< 300 h). Intrinsic chemical failure (InCF) occurred after the full consumption of Al, and resulted in Cr2O3 growth and CrN precipitation at the Al2O3/alloy interface. Mass gain slowed down after InCF, even leading to a mass loss associated with the volatilization of Cr2O3. InCF occurred after [10–20] h and [20–100] h for the ∼ 21 μm and ∼ 31 μm-thick specimens, respectively. Severe metal recession was observed after InCF.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
Funders:
Agence Nationale de la Recherche - ANR
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Deposited On:16 Nov 2021 08:21

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