Thermal barrier coatings (TBCs) consisting of a MCrAlY bond coat and a YSZ topcoat were air plasma sprayed onto Hastelloy X substrates. Samples were thermally cycled between 100 °C and 1100 °C and thermal fatigue failures were investigated via microstructure analyses. Final fatigue failure was caused by the formation of interface-parallel cracks in the topcoat, which was found to strongly related to the oxidation behavior of the bond coat. The development of oxide layers was therefore studied in detail and a thermo-kinetic model was used to explore the role of elemental diffusion in oxide formation.

air plasma spraying, microstructure, superalloy bond coats, thermal barrier coatings, thermal fatigue failure, YSZ topcoats
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Copyright © 2016 DVS Media GmbH. All rights reserved.
2016
DVS Media GmbH
Topics
Microstructure Thermal barrier coatings Nickel-cobalt-chromium alloys Yttria-stabilized zirconia Plasma spray coating Thermal fatigue fracture
Issue Section:
Power Generation Applications
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