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

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

doi:10.1115/1.4041309

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

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

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

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 12.5mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.

Original language	English
Article number	031004
Journal	Journal of Engineering for Gas Turbines and Power
Volume	141
Issue number	3
DOIs	https://doi.org/10.1115/1.4041309
State	Published - Mar 1 2019

Funding

The authors would like to thank G. W. Garner, T. M. Lowe, M. Stephens, and T. Jordan for assistance with the experimental work. Stony Brook University applied the thermally sprayed coatings. S. Dryepondt and J. Jun at ORNL provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Turbine Program (R. Dennis program manager). This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan2.

Funders	Funder number
U.S. Department of Energy
Office of Fossil Energy

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title = "The Effect of Coating Composition and Geometry on Thermal Barrier Coatings Lifetime",

abstract = "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 12.5mm diameter rod specimens have much shorter 100 h cycle lifetimes than disk specimens. Much longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.",

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

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