The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime

Pint, Bruce A.; Lance, Michael J.; Haynes, James Allen

doi:10.1115/1.4041309

The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime

Journal Article · Thu Oct 04 00:00:00 EDT 2018 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.4041309· OSTI ID:1484121

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

Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in land-based gas turbines where coatings are mainly thermally sprayed. This study examined high velocity oxygen fuel (HVOF), air plasma-sprayed (APS), and vacuum plasma-sprayed (VPS) MCrAlYHfSi bond coatings with APS YSZ top coatings at 900–1100 °C. For superalloy 247 substrates and VPS coatings tested in 1 h cycles at 1100 °C, removing 0.6 wt %Si had no effect on average lifetime in 1 h cycles at 1100 °C, but adding 0.3%Ti had a negative effect. Rod specimens were coated with APS, HVOF, and HVOF with an outer APS layer bond coating and tested in 100 h cycles in air + 10%H₂O at 1100 °C. With an HVOF bond coating, initial results indicate that 12.5 mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Furthermore, much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.

View Accepted Manuscript (DOE)

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:: 1484121

Journal Information:: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 3 Vol. 141; ISSN 0742-4795

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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