Effect of Air Plasma Sprayed Flash Bond Coatings on Furnace Cycle Lifetime of Disks and Rods

Pint, Bruce; Lance, Michael J.; Haynes, James A.; Gildersleeve, Edward J.; Sampath, Sanjay

doi:10.1115/1.4046694

Title: Effect of Air Plasma Sprayed Flash Bond Coatings on Furnace Cycle Lifetime of Disks and Rods

Journal Article · Mon Nov 30 00:00:00 EST 2020 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.4046694· OSTI ID:1731076

^[1];

^[1]; Gildersleeve, Edward J. ^[2]; Sampath, Sanjay ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Stony Brook Univ., NY (United States)

Air plasma sprayed (APS) flash coatings on high velocity oxygen fuel (HVOF) bond coatings are well known to extend the lifetime of thermal barrier coatings (TBCs). Recent work compared flash coatings of NiCoCrAlY and NiCoCrAlYHfSi applied to both rods and disk substrates of alloy 247. For rod specimens, 100 h cycles were used at 1100 °C in wet air. Both flash coatings significantly improved the lifetime compared to HVOF-only and vacuum plasma spray (VPS)-only MCrAlY bond coatings with no statistical difference between the two flash coatings. For disk specimens tested in 1 h cycles at 1100 °C in wet air, the NiCoCrAlY flash coating significantly outperformed an HVOF-only NiCoCrAlYHfSi bond coating and a NiCoCrAlYHfSi flash coating. The flash coatings formed a mixed oxide-metal zone that appeared to inhibit crack formation and therefore extend lifetime. In addition to the flash coating increasing the bond coating roughness, the underlying HVOF layer acted as a source of Al for this intermixed zone and prevented the oxide from penetrating deeper into the bond coating. Here, the lower Y+Hf content in the Y-only flash coating appeared to minimize oxidation in the flash layer, thereby increasing the benefit compared to a NiCoCrAlYHfSi flash coating.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725; FEAA122

OSTI ID:: 1731076

Journal Information:: Journal of Engineering for Gas Turbines and Power, Vol. 142, Issue 12; ISSN 0742-4795

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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