Production and characterization of duplex coatings (HVOF and PVD) on TI6AL4V substrate. nanoSMat2005, International Conference on Surfaces, Coatings and Nanostructured Materials.

Mechanical resistance of non ferrous alloy components subject to severe wear conditions strongly depends on the thickness of the surface protective wear resistant layer. PVD coatings shows both very low values for wear rate and friction coefficient and high hardness. Nevertheless PVD techniques allow to obtain just thin coatings (< 10&#956;m), which do not warrant good mechanical resistance in presence of highly localized loads, during the whole lifetime of component. Such limit is currently overcame by utilizing duplex processes or multilayer coatings, which allow to reach high thickness with mechanical properties increasing gradually from the substrate-coating interface to the outer surface. Present paper deals with production and characterization of HVOF PVD duplex coatings deposited on Ti6Al4V for application in automotive industry.Mechanical resistance of non ferrous alloy components subject to severe wear conditions strongly depends on the thickness of the surface protective wear resistant layer. PVD coatings shows both very low values for wear rate and friction coefficient and high hardness. Nevertheless PVD techniques allow to obtain just thin coatings (< 10&#956;m), which do not warrant good mechanical resistance in presence of highly localized loads, during the whole lifetime of component. Such limit is currently overcame by utilizing duplex processes or multilayer coatings, which allow to reach high thickness with mechanical properties increasing gradually from the substrate-coating interface to the outer surface. Present paper deals with production and characterization of HVOF PVD duplex coatings deposited on Ti6Al4V for application in automotive industry.