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Tribological Behavior of TiAlN, AlTiN, and AlCrN Coatings at Boundary Lubricating Condition

D.Özkan, Y.Erarslan, E.Sulukan, L.Kara, M.A.Yılmaz, M.B.Yağcı,  Tribological Behavior of TiAlN, AlTiN, and AlCrN Coatings at Boundary Lubricating Condition,Tribology Letters,66(12)(2018)152-168.

Abstract
In this study, ~ 3.5µm thick multilayer titanium alumina nitride (TiAlN), alumina titanium nitride (AlTiN), and alumina chro-mium nitride (AlCrN) coatings were deposited on the H13 steel surface by cathodic arc physical vapor deposition(CAPVD) method. The tribological performance of the coatings was evaluated by a tribometer at boundary lubrication condition. Then, coating surfaces were observed by optical microscope, optical profilometer, and atomic force microscope to evaluate the morphological changes, wear volumes, and tribofilm thickness. Also, scanning electron microscopy (energy dispersive X-ray) and X-ray photoelectron spectrometry analyses were applied to coating surfaces for the tribochemical evolution of the tribofilm. Results showed that AlCrN coating performed the best tribological behavior at boundary lubricated condition, when compared to TiAlN and AlTiN coatings and it can be used as a wear resistant cam tappet coating in internal combus-tion engines.
Keywords:  Multilayer wear resistant coatings· Cathodic arc physical vapor deposition (CAPVD)· Boundary lubrication condition· Wear volume· Tribofilm thickness


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