Synthesis and Oxidation Behavior of Nanocrystalline MCrAlY Bond Coatings

Thermal barrier coating systems protect turbine blades against high-temperature corrosion and oxidation. They consist of a metal bond coat (MCrAlY, M = Ni, Co) and a ceramic top layer (ZrO2/Y^sub 2^O3). In this work, the oxidation behavior of conventional and nanostructured high-velocity oxyfuel (HV...

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Bibliographic Details
Published inJournal of thermal spray technology Vol. 14; no. 1; pp. 23 - 30
Main Authors Ajdelsztajn, Leonardo, Tang, Feng, Kim, George E., Provenzano, Virgil, Schoenung, Julie M.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.03.2005
Subjects
Bonding
Coatings
Flame spraying
High temperature
Nanocrystals
Nanostructure
Nickel
Oxidation
Oxidation resistance
Protective coatings
Turbines
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Summary:Thermal barrier coating systems protect turbine blades against high-temperature corrosion and oxidation. They consist of a metal bond coat (MCrAlY, M = Ni, Co) and a ceramic top layer (ZrO2/Y^sub 2^O3). In this work, the oxidation behavior of conventional and nanostructured high-velocity oxyfuel (HVOF) NiCrAlY coatings has been compared. Commercially available NiCrAlY powder was mechanically cryomilled and HVOF sprayed on a nickel alloy foil to form a nanocrystalline coating. Freestanding bodies of conventional and nanostructured HVOF NiCrAlY coatings were oxidized at 1000 °C for different time periods to form the thermally grown oxide layer. The experiments show an improvement in oxidation resistance in the nanostructured coating when compared with that of the conventional one. The observed behavior is a result of the formation of a continuous Al^sub 2^O3 layer on the surface of the nanostructured HVOF NiCrAlY coating. This layer protects the coating from further oxidation and avoids the formation of mixed oxide protrusions present in the conventional coating.[PUBLICATION ABSTRACT]
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ISSN:1059-9630
1544-1016
DOI:10.1361/10599630522693