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Title: 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% H 2O 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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE), Oil and Natural Gas (FE-30)
OSTI Identifier:
1513427
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: 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:
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. doi: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. doi:10.1007/s11085-019-09903-3.
@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},
issn = {0030-770X},
number = 5-6,
volume = 91,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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Works referenced in this record:

Damage quantification in TBCs by photo-stimulated luminescence spectroscopy
journal, September 2001