Effect of APS flash bond coatings and curvature on TBC performance on rod specimens
Journal Article
·
· Surface and Coatings Technology
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Northern Arizona Univ., Flagstaff, AZ (United States)
- Stony Brook Univ., NY (United States)
The addition of an air plasma sprayed (APS) “flash” bond coating layer on top of a high velocity oxy-fuel (HVOF) bond coating greatly extended the lifetime of APS yttria stabilized zirconia (YSZ) thermal barrier coatings (TBC) on rod specimens of superalloy 247 tested using 100-h cycles in air+10%H2O at 1100 °C. The flash bond coatings of both NiCoCrAlY and NiCoCrAlYHfSi powder were compared to an HVOF-only and a vacuum plasma sprayed (VPS) NiCoCrAlYHfSi bond coating. Here, the flash coatings appear to form a mixed oxide-metal zone, which likely inhibits crack formation and therefore extends lifetime compared to conventional bond coatings. The underlying dense HVOF layer appeared to act as a source of Al for this intermixed zone and prevented the oxide from penetrating deeper into the bond coating. Residual stress in the thermally-grown Al2O3 scale was measured using photo-luminescence piezospectroscopy (PLPS) as a function of time for each coating variation, including a comparison of concave and convex surfaces on a specially designed rod.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1561649
- Alternate ID(s):
- OSTI ID: 1561412
- Journal Information:
- Surface and Coatings Technology, Journal Name: Surface and Coatings Technology Journal Issue: C Vol. 378; ISSN 0257-8972
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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