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Evaluation of the Hot-Corrosion Behavior of Thermal Barrier Coatings
Research and development rept.
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
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In order to assess the sulfidation resistance of thermal barrier coatings for marine gas turbines, ceramic materials used in the coatings were exposed to molten sodium sulfate for periods up to 1000 hours and the coatings themselves were burner rig tested at high salt levels. The ceramics stabilized zirconias were found to be resistant to sulfidation attack while the graded metalceramic coatings were resistant to attack and were protective to the substrate alloys only when very adherent. It was also shown that coatings with a high metallic content performed well in this respect, while still providing significant thermal insulation. Tests with hollow, air-cooled, coated specimens indicated that a sufficiently high external surface temperature can retard sulfidation attack at lower temperature interior coating sites. Modified author abstract
APPROVED FOR PUBLIC RELEASE