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Coatings 2018, 8(4), 129;

Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings

Department of Management and Engineering, Linköping University, 581 83 Linköping, Sweden
Siemens Industrial Turbomachinery AB, 612 83 Finspång, Sweden
Author to whom correspondence should be addressed.
Received: 14 March 2018 / Revised: 27 March 2018 / Accepted: 1 April 2018 / Published: 3 April 2018
(This article belongs to the Special Issue Thermal Barrier Coatings)
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MCrAlX (M: Ni or Co or both, X: minor elements) coatings have been used widely to protect hot components in gas turbines against oxidation and heat corrosion at high temperatures. Understanding the influence of the X-elements on oxidation behavior is important in the design of durable MCrAlX coatings. In this study, NiCoCrAlX coatings doped with Y + Ru and Ce, respectively, were deposited on an Inconel-792 substrate using high velocity oxygen fuel (HVOF). The samples were subjected to isothermal oxidation tests in laboratory air at 900, 1000, and 1100 °C and a cyclic oxidation test between 100 and 1100 °C with a 1-h dwell time at 1100 °C. It was observed that the coating with Ce showed a much higher oxidation rate than the coating with Y + Ru under both isothermal and cyclic oxidation tests. In addition, the Y + Ru-doped coating showed significantly lower β phase depletion due to interdiffusion between the coating and the substrate, resulting from the addition of Ru. Simulation results using a moving phase boundary model and an established oxidation-diffusion model showed that Ru stabilized β grains, which reduced β-depletion of the coating due to substrate interdiffusion. This paper, combining experiment and simulation results, presents a comprehensive study of the influence of Ce and Ru on oxidation behavior, including an investigation of the microstructure evolution in the coating surface and the coating-substrate interface influenced by oxidation time. View Full-Text
Keywords: MCrAlX coatings; Ruthenium; Cerium; oxidation; simulation MCrAlX coatings; Ruthenium; Cerium; oxidation; simulation

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Zhang, P.; Lin Peng, R.; Li, X.-H.; Johansson, S. Investigation of Element Effect on High-Temperature Oxidation of HVOF NiCoCrAlX Coatings. Coatings 2018, 8, 129.

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