Oxidation of Metals

, Volume 84, Issue 1–2, pp 185–209 | Cite as

High Temperature Reaction of MCrAlY Coating Compositions with CaO Deposits

  • Thomas Gheno
  • Gerald H. Meier
  • Brian Gleeson
Original Paper


The reactivity of β-NiAl + γ-Ni-based NiCoCrAlY alloys with and without CaO deposits was studied by means of isothermal exposures in air. Reaction with CaO at 1100 °C produced multi-layer scales of Al2O3 and calcium aluminates, and a mixture of liquid calcium chromate and nickel–cobalt oxide particles. Calcium chromate formation was a rapid, transient process, and the transition to a steady-state of slower Al2O3 growth was favored by increasing the alloy β fraction. The thermally-growing Al2O3 reacted with the deposit to form calcium aluminates in a solid-state diffusion process, which led to an increased oxidation rate. The analysis of Al2O3 growth kinetics in the production-destruction regime was used to account for the increased flux of aluminum entering the multi-layer scale. The effect of temperature on the ability to kinetically sustain an Al2O3 scale was then evaluated on the basis of Wagner’s criterion. Predicted results were consistent with the experimentally observed absence of passivation at 900 °C.


MCrAlY alloys Multi-layer scales Al2O3 growth kinetics CaO deposits 



This work was supported by the Department of Energy through the University Turbine Systems Research (UTSR) Program run by the National Energy Technology Laboratory, Award Number DE-FE0007271, Seth Lawson, Project Manager. The authors thank Wei Zhao and Juan Manuel Alvarado Orozco for useful discussions on some aspects of this work.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPittsburghUSA

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