Interface science of thermal barrier coatings
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The drive for greater efficiency in propulsion and industrial/power production machinery has pushed metallurgists to develop ever better alloys and taken existing metallic components to their reliability threshold. Nowhere is that better illustrated than in gas turbine engine materials. The nickel-based superalloys currently in use for the most demanding areas of the engines melt at 1,230–1,315 °C and yet see combustion environments ~1,600 °C. The result is that these components require thermal protection to avoid failure from phenomena such as melting, creep, oxidation, thermal fatigue, and so on . The stakes are high as the equipment must remain reliable for thousands of take-offs and landings for aircraft turbine engines, and at least 40,000 h of operation in power generating land-based gas turbines [2, 3]. The most critical items that see both the greatest temperatures and experience the highest stresses are the hot-section components, particularly the high pressure turbine...
KeywordsHafnium Turbine Blade Bond Coat Thermal Barrier Coating Thermally Grown Oxide
The research was sponsored by the Office of Fossil Energy, National Energy Technology Laboratory, U.S. Department of Energy, under contract number DE-AC05-00OR22725 with UT-Battelle, LLC.
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