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Coatings 2019, 9(3), 166; https://doi.org/10.3390/coatings9030166

Cyclic Hot Corrosion Failure Behaviors of EB-PVD TBC Systems in the Presence of Sulfate and Vanadate Molten Salts

1
Department of Metallurgical and Materials Engineering, Faculty of Engineering, Bartin University, 74100 Bartin, Turkey
2
Department of Mechanical Engineering, Faculty of Engineering, Bartin University, 74100 Bartin, Turkey
3
Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karabuk University, 78050 Karabuk, Turkey
*
Author to whom correspondence should be addressed.
Received: 28 January 2019 / Revised: 19 February 2019 / Accepted: 20 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Anticorrosion Protection of Nonmetallic and Metallic Coatings)
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Abstract

The cold gas dynamic spray (CGDS) method has been considered a promising technology to produce a metallic bond coat for thermal barrier coating (TBC) systems. In this study, CoNiCrAlY bond coats produced by CGDS method were coated with yttria-stabilized zirconia (YSZ) by electron beam physical vapor deposition (EB-PVD). TBCs were subjected to 50 wt % V2O5 and 50 wt % Na2SO4 molten hot corrosion salt combinations at 1000 °C. In the case of YSZ top coat on TBCs, the reaction between Na2SO4, V2O5, and Y2O3 salts generates YVO4 crystals, and these structures cause the transformation of tetragonal ZrO2 to monoclinic ZrO2. This situation occurs under operating conditions that lead to TBC failure. Hot corrosion behavior and the related failure mechanisms of TBC systems were investigated and discussed using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) analysis, and X-ray diffractometer (XRD). View Full-Text
Keywords: thermal barrier coatings (TBCs); electron beam physical vapor deposition (EB-PVD); cold gas dynamic spray (CGDS); hot corrosion; molten salts thermal barrier coatings (TBCs); electron beam physical vapor deposition (EB-PVD); cold gas dynamic spray (CGDS); hot corrosion; molten salts
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ozgurluk, Y.; Doleker, K.M.; Ozkan, D.; Ahlatci, H.; Karaoglanli, A.C. Cyclic Hot Corrosion Failure Behaviors of EB-PVD TBC Systems in the Presence of Sulfate and Vanadate Molten Salts. Coatings 2019, 9, 166.

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