This study evaluates the effect of Ru and Ce on the oxidation behavior of NiCoCrAl coatings deposited by HVOF spraying. Isothermal oxidation tests were conducted at 900, 1000, and 1100 °C. Test samples were also cycled between 100 °C and 1100 °C, with a dwell time of 1 h at 1100 °C. In both cases, coatings with Ru had a lower oxidation rate than those with Ce additions. β-depletion due to interdiffusion was also found to be lower when Ru was present. To help explain the findings, simulation results are presented and discussed along with observations on the influence of oxidation time on microstructure evolution.

cesium doping, high-velocity oxyfuel spraying, microstructure, NiCoCrAl coatings, oxidation behavior, ruthenium doping
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Copyright © 2016 DVS Media GmbH. All rights reserved.
2016
DVS Media GmbH
Topics
Microstructure Nickel-cobalt-chromium alloys High-velocity oxyfuel spray coating Oxidation stability Cesium Ruthenium
Issue Section:
Power Generation Applications
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