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Effect of Cycle Frequency on High Temperature Oxidation Behavior of Alumina-forming Coatings Used for Industrial Gas Turbine Blades

Abstract : Oxidation kinetics of platinum modified aluminide and overlay coatings on nickel base superalloys were investigated. Isothermal oxidation tests were carried out at 1050°C in synthetic air. Cyclic oxidation tests were performed with 2 cycle frequencies : - Short term cycles : 1h dwells at 1050°C in synthetic air ×1800 cycles - Long term cycles : 300h dwells at 1050°C in laboratory air × 6 cycles (experiment planned to totalize at least 10 000 hours at high temperature) The mass gain curves point out a large effect of the cycle frequency at 1050°C for overlay NiCoCrAlYTa coating whereas the effect is less significant for Pt-modified nickel aluminide coating. Scanning electron microscopy combined with energy dispersive X-ray spectroscopy was used to evaluate the effect of cycle frequency on microstructural evolution. A simple statistical spalling model [1,2], assuming that the parabolic rate constant kp and the spalling probability p are constant, is tentatively applied and discussed in view of the microstructural evolution complexity.
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https://hal.archives-ouvertes.fr/hal-01688462
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Submitted on : Friday, January 19, 2018 - 2:05:25 PM
Last modification on : Wednesday, July 14, 2021 - 3:01:34 AM

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Nadia Vialas, Daniel Monceau, Bernard Pieraggi. Effect of Cycle Frequency on High Temperature Oxidation Behavior of Alumina-forming Coatings Used for Industrial Gas Turbine Blades. 6th International Symposium on High Temperature Corrosion and Protection of Materials, May 2004, Les Embiez, France. pp. 747-754, ⟨10.4028/www.scientific.net/MSF.461-464.747⟩. ⟨hal-01688462⟩

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