The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance
Abstract
To study the benefit of ~ 50-µm-thick air-plasma-sprayed (APS) ‘flash’ bond coatings, NiCoCrAlYHfSi high-velocity oxygen fuel (HVOF) bond coatings were deposited on alloy 247 disk substrates with APS yttria-stabilized zirconia topcoatings. Using 1-h cycles at 1100 °C in air with 10% H2O and HVOF-only bond coatings as a baseline, APS flash coatings extended the average coating lifetime by > 10% using NiCoCrAlYHfSi and > 70% using NiCoCrAlY powder. Coatings were characterized after 0, 100 and 300 cycles and after failure. Residual stress in the thermally grown alumina scale was mapped every 100 cycles using photo-stimulated luminescence piezospectroscopy. The flash coating created an interlocked metal–alumina layer that appeared to inhibit critical crack formation, and the underlying HVOF layer prevented further internal oxidation and appeared to supply the APS flash coating with Al. Furthermore, the addition of Hf and Y to the flash coating increased internal oxidation and accelerated Al consumption, thereby reducing the benefit of the flash coating.
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE), Oil & Natural Gas
- OSTI Identifier:
- 1513427
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Oxidation of Metals
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 5-6; Journal ID: ISSN 0030-770X
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Photo-stimulated luminescence piezospectroscopy (PLPS); Furnace cycle testing (FCT); APS flash coating; Alumina scale; TBC; HVOF bond coating
Citation Formats
Lance, Michael J., Thiesing, Benjamin P., Haynes, James A., Parish, Chad M., and Pint, Bruce A. The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance. United States: N. p., 2019.
Web. doi:10.1007/s11085-019-09903-3.
Lance, Michael J., Thiesing, Benjamin P., Haynes, James A., Parish, Chad M., & Pint, Bruce A. The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance. United States. https://doi.org/10.1007/s11085-019-09903-3
Lance, Michael J., Thiesing, Benjamin P., Haynes, James A., Parish, Chad M., and Pint, Bruce A. Fri .
"The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance". United States. https://doi.org/10.1007/s11085-019-09903-3. https://www.osti.gov/servlets/purl/1513427.
@article{osti_1513427,
title = {The Effect of HVOF Bond Coating with APS Flash Coating on TBC Performance},
author = {Lance, Michael J. and Thiesing, Benjamin P. and Haynes, James A. and Parish, Chad M. and Pint, Bruce A.},
abstractNote = {To study the benefit of ~ 50-µm-thick air-plasma-sprayed (APS) ‘flash’ bond coatings, NiCoCrAlYHfSi high-velocity oxygen fuel (HVOF) bond coatings were deposited on alloy 247 disk substrates with APS yttria-stabilized zirconia topcoatings. Using 1-h cycles at 1100 °C in air with 10% H2O and HVOF-only bond coatings as a baseline, APS flash coatings extended the average coating lifetime by > 10% using NiCoCrAlYHfSi and > 70% using NiCoCrAlY powder. Coatings were characterized after 0, 100 and 300 cycles and after failure. Residual stress in the thermally grown alumina scale was mapped every 100 cycles using photo-stimulated luminescence piezospectroscopy. The flash coating created an interlocked metal–alumina layer that appeared to inhibit critical crack formation, and the underlying HVOF layer prevented further internal oxidation and appeared to supply the APS flash coating with Al. Furthermore, the addition of Hf and Y to the flash coating increased internal oxidation and accelerated Al consumption, thereby reducing the benefit of the flash coating.},
doi = {10.1007/s11085-019-09903-3},
journal = {Oxidation of Metals},
number = 5-6,
volume = 91,
place = {United States},
year = {Fri Feb 22 00:00:00 EST 2019},
month = {Fri Feb 22 00:00:00 EST 2019}
}
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