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Materials 2016, 9(12), 961; doi:10.3390/ma9120961

Thermal Shock and Oxidation Behavior of HiPIMS TiAlN Coatings Grown on Ti-48Al-2Cr-2Nb Intermetallic Alloy

1
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
2
National Research Council (CNR) of Italy, Istituto di Chimica della Materia Condensata e di Tecnologie per l’Energia (ICMATE), Corso Stati Uniti 4, Padova 35127, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Received: 23 September 2016 / Revised: 7 November 2016 / Accepted: 21 November 2016 / Published: 25 November 2016
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Abstract

A High Power Impulse Magnetron Sputtering (HiPIMS) method for depositing TiAlN environmental barrier coatings on the surface of Ti-48Al-2Cr-2Nb alloy was developed in view of their exploitation in turbine engines. Three differently engineered TiAlN films were processed and their performance compared. Bare intermetallic alloy coupons and coated specimens were submitted to thermal cycling under oxidizing atmosphere up to 850 °C or 950 °C, at high heating and cooling rates. For this purpose, a burner rig able to simulate the operating conditions of the different stages of turbine engines was used. Microstructures of the samples were compared before and after each test using several techniques (microscopy, XRD, and XPS). Coating-intermetallic substrate adhesion and tribological properties were investigated too. All the TiAlN films provided a remarkable increase in oxidation resistance. Good adhesion properties were observed even after repeated thermal shocks. HiPIMS pretreatments of the substrate surfaces performed before the coating deposition significantly affected the oxidation rate, the oxide layer composition and the coating/substrate adhesion. View Full-Text
Keywords: HiPIMS TiAlN coating; burner rig; oxidation behavior; thermal shock resistance HiPIMS TiAlN coating; burner rig; oxidation behavior; thermal shock resistance
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MDPI and ACS Style

Badini, C.; Deambrosis, S.M.; Padovano, E.; Fabrizio, M.; Ostrovskaya, O.; Miorin, E.; D’Amico, G.C.; Montagner, F.; Biamino, S.; Zin, V. Thermal Shock and Oxidation Behavior of HiPIMS TiAlN Coatings Grown on Ti-48Al-2Cr-2Nb Intermetallic Alloy. Materials 2016, 9, 961.

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