Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature - IMT Mines Albi-Carmaux Access content directly
Journal Articles Corrosion Science Year : 2021

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

Damien Texier
Maxime Ecochard
Mehdi Salem
Philippe Lours

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.
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Dates and versions

hal-03196688 , version 1 (15-04-2021)

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Damien Texier, Maxime Ecochard, Thomas Gheno, Daniel Monceau, Mehdi Salem, et al.. Screening for Al2O3 failure in MCrAlY APS coatings using short-term oxidation at high temperature. Corrosion Science, 2021, 184, pp.1-15/109334. ⟨10.1016/j.corsci.2021.109334⟩. ⟨hal-03196688⟩
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