Abstract
Several factors are being investigated that affect the performance of thermal barrier coatings (TBC) for use in landbased 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 0.6wt.%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. Longer lifetimes were obtained when the bond coating had an inner HVOF layer and outer APS layer.
Original language | English |
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Title of host publication | Ceramics; Controls, Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy |
Publisher | American Society of Mechanical Engineers (ASME) |
ISBN (Electronic) | 9780791850916 |
DOIs | |
State | Published - 2017 |
Event | ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 - Charlotte, United States Duration: Jun 26 2017 → Jun 30 2017 |
Publication series
Name | Proceedings of the ASME Turbo Expo |
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Volume | 6 |
Conference
Conference | ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 |
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Country/Territory | United States |
City | Charlotte |
Period | 06/26/17 → 06/30/17 |
Funding
The authors would like to thank G. W. Garner, T. M. Lowe, M. Stephens and T. Jordan for assistance with the experimental work. Stonybrook Univ. applied the thermally sprayed coatings. S. Dryepondt 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 Plan (http://energy.gov/downloads/doe-public-access-plan).