APS TBC performance on directionally-solidified superalloy substrates with HVOF NiCoCrAlYHfSi bond coatings

Lance, Michael J.; Unocic, Kinga A.; Haynes, James A.; Pint, Bruce A.

doi:10.1016/j.surfcoat.2015.08.067

Title: APS TBC performance on directionally-solidified superalloy substrates with HVOF NiCoCrAlYHfSi bond coatings

Journal Article · Fri Sep 04 00:00:00 EDT 2015 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2015.08.067· OSTI ID:1234328

Lance, Michael J. ^[1]; Unocic, Kinga A. ^[1]; Haynes, James A. ^[1]; Pint, Bruce A. ^[1]

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

Directionally-solidified (DS) superalloy components with advanced thermal barrier coatings (TBC) to lower the metal operating temperature have the potential to replace more expensive single crystal superalloys for large land-based turbines. In order to assess relative TBC performance, furnace cyclic testing was used with superalloys 1483, X4 and Hf-rich DS 247 substrates and high velocity oxygen fuel (HVOF)-NiCoCrAlYHfSi bond coatings at 1100 °C with 1-h cycles in air with 10% H₂O. With these coating and test conditions, there was no statistically-significant effect of substrate alloy on the average lifetime of the air plasma sprayed (APS) yttria-stabilized zirconia (YSZ) top coatings on small coupons. Using photo-stimulated luminescence piezospectroscopy maps at regular cycling intervals, the residual compressive stress in the α-Al₂O₃ scale underneath the YSZ top coating and on a bare bond coating was similar for all three substrates and delaminations occurred at roughly the same rate and frequency. As a result, x-ray fluorescence (XRF) measurements collected from the bare bond coating surface revealed higher Ti interdiffusion occurring with the 1483 substrate, which contained the highest Ti content.

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

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1234328

Alternate ID(s):: OSTI ID: 1249583

Journal Information:: Surface and Coatings Technology, Vol. 284; ISSN 0257-8972

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Cited By (1)

The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance Lance, M. J.; Thiesing, B. P.; Haynes, J. A. Oxidation of Metals, Vol. 91, Issue 5-6 https://doi.org/10.1007/s11085-019-09903-3	journal	February 2019

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
photo-stimulated luminescence piezospectroscopy (PLPS)
water vapor
bond coating
alumina scale
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directionally-solidified superalloy

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