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

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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https://hal-mines-albi.archives-ouvertes.fr/hal-03196688
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Submitted on : Thursday, April 15, 2021 - 6:41:50 PM
Last modification on : Tuesday, July 13, 2021 - 8:20:09 AM
Long-term archiving on: : Friday, July 16, 2021 - 7:16:12 PM

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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, Elsevier, 2021, 184, pp.1-15/109334. ⟨10.1016/j.corsci.2021.109334⟩. ⟨hal-03196688⟩

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