The Effect of APS-HVOF Bond Coating Thickness Ratio on TBC Furnace Cycle Lifetime

Lance, Michael J.; Kane, Kenneth A.; Pint, Bruce A.

doi:10.1007/s11085-022-10127-1

Title: The Effect of APS-HVOF Bond Coating Thickness Ratio on TBC Furnace Cycle Lifetime

Journal Article · Sat Aug 13 00:00:00 EDT 2022 · Oxidation of Metals

DOI:https://doi.org/10.1007/s11085-022-10127-1· OSTI ID:1890348

^[1]; Kane, Kenneth A. ^[1];

^[1]

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

In this work, combinations of NiCoCrAlY APS and high-velocity oxygen fuel (HVOF) bond coatings were deposited on alloy 247 disk substrates with APS yttria-stabilized zirconia (YSZ) top coatings to assess the benefit of air plasma sprayed (APS) ‘flash’ bond coatings. Using 1-h cycles at 1100 °C in air with 10% H₂O and HVOF-only and APS-only bond coatings as a baseline, it was found that APS flash coatings extended the average coating lifetime by 16% to 35% with the thicker flash coating performing best. Principal component analysis and energy dispersive spectroscopy (EDS) compositional mapping on coatings characterized after 0, 100, 300 and 500 cycles and after failure showed that the Al in the bond coatings was depleted due to both oxidation and back diffusion into the substrate. The APS-only bond coating had significant oxidation throughout the bond coating and was so depleted in Al, that Al diffused from the substrate to the coating. Residual stress maps of the thermally-grown alumina scale were obtained every 100 cycles using photo-stimulated luminescence piezospectroscopy (PLPS) revealing that the Thick Flash coating had the slowest rate of damage accumulation in the oxide scale.

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

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1890348

Journal Information:: Oxidation of Metals, Vol. 98, Issue 3-4; ISSN 0030-770X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Principal component analysis (PCA)
furnace cycle testing (FCT)
APS flash coating
alumina scale
TBC
HVOF bond coating

Title: The Effect of APS-HVOF Bond Coating Thickness Ratio on TBC Furnace Cycle Lifetime

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