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Blistering of MCrAlY-coatings in H2/H2O-atmospheres |
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| Authors: | M Subanovic M Kamruddin L Singheiser |
| Affiliation: | a Forschungszentrum Jülich GmbH, IEF-2, Leo-Brandt Street, 52425, Jülich, Germany b Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India c Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA |
| Abstract: | The oxidation behavior of vacuum plasma sprayed, free-standing MCrAlY-coatings was studied in Ar-20%O2 and Ar-4%H2-2%H2O. During exposure in Ar-4%H2-2%H2O the coating formed large “blisters”. This phenomenon was attributed to H2-gas evolution within the coating, creating high pressures sufficient for coating plastic deformation as a result of atomic hydrogen recombination on coating defects. It is suggested that the hydrogen is produced at the scale/metal interface by reaction of H2O-vapor with yttrium and aluminium present in the coating. |
| Keywords: | Oxidation Hydrogen embrittlement Hydrogen absorption High-temperature corrosion Rare earth elements |
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