The influence, and interdependence, of water vapor and Na2SO4–50 mol% NaCl on the oxidation of a NiCoCrAlY coating and a thermal barrier coating (TBC) were studied at 750 °C. Water vapor was found to have a negligible effect on oxide composition, but influenced the oxide morphology on the NiCoCrAlY coating. Na2SO4–50 mol% NaCl deposits on the coatings influenced oxide composition, most notably by the promotion of a Y rich phase. The effect of Na2SO4–50 mol% NaCl deposits was also evident for the TBC coated specimen, where the formed metal/ceramic interface oxide was affected by salt reaching the interface by penetration of the zirconia TBC.
- International Gas Turbine Institute
Cyclic Hot Corrosion of Thermal Barrier Coatings and Overlay Coatings
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Eriksson, R, Brodin, H, Johansson, S, Östergren, L, & Li, X. "Cyclic Hot Corrosion of Thermal Barrier Coatings and Overlay Coatings." Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers. San Antonio, Texas, USA. June 3–7, 2013. V004T02A009. ASME. https://doi.org/10.1115/GT2013-95526
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