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Article

Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy

1
Department of Mechanical Engineering, Bialystok Technical University, 45 Wiejska, 15333 Białystok, Poland
2
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02507 Warszawa, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(14), 3240; https://doi.org/10.3390/ma13143240
Received: 5 March 2020 / Revised: 16 July 2020 / Accepted: 17 July 2020 / Published: 21 July 2020
(This article belongs to the Special Issue Thermal Barrier Coatings)
The effects of exposure to overheating (temperature above 1000 °C) on the degradation (modification) of layers of coatings (coatings based on aluminum) of uncooled polycrystalline rotor blades of aircraft turbine jet engines were investigated under laboratory conditions. In order to determine the nature of the changes as well as the structural changes in the various zones, a multi-factor analysis of the layers of the coating, including the observation of the surface of the blades, using, among others, electron microscopy, structural tests, surface morphology, and chemical composition testing, was carried out. As a result of the possibility of strengthening the physical foundations of the non-destructive testing of blades, the undertaken research mainly focused on the characteristics of the changes occurring in the outermost layers of the coatings. The obtained results indicate the structural degradation of the coatings, particularly the unfavorable changes, become visible after heating to 1050 °C. The main, strongly interacting, negative phenomena include pore formation, external diffusion of Fe and Cr to the surface, and the formation and subsequent thickening of Fe-Cr particles on the surface of the alumina layer. View Full-Text
Keywords: turbine blade; nickel-based superalloys; aluminide layer; high temperature; electron microscopy turbine blade; nickel-based superalloys; aluminide layer; high temperature; electron microscopy
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MDPI and ACS Style

Bogdan, M.; Zieliński, W.; Płociński, T.; Kurzydłowski, K.J. Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy. Materials 2020, 13, 3240. https://doi.org/10.3390/ma13143240

AMA Style

Bogdan M, Zieliński W, Płociński T, Kurzydłowski KJ. Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy. Materials. 2020; 13(14):3240. https://doi.org/10.3390/ma13143240

Chicago/Turabian Style

Bogdan, Mariusz, Witold Zieliński, Tomasz Płociński, and Krzysztof J. Kurzydłowski. 2020. "Electron Microscopy Characterization of the High Temperature Degradation of the Aluminide Layer on Turbine Blades Made of a Nickel Superalloy" Materials 13, no. 14: 3240. https://doi.org/10.3390/ma13143240

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