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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2009

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Multilayer, hybrid PVD coatings on Ti6Al4V titanium alloy

Pawlak W., Wendler B.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

660-667

Purpose: The main purpose of this paper was to develop hybrid PVD technology of deposition wear resistant, multilayer coatings onto diffusion-hardened Ti6Al4V titanium alloy. Titanium and its alloys are desirable materials in modern constructions and vehicles. They have a high specific strength and very good corrosion resistance and biocompatibility. On the other hand, they have a low load-bearing capacity and poor tribological properties, as, for example, high friction coefficient, low resistance to adhesive and abrasive wear and tendency to galling. Development of multiplex coatings depositions techniques is vital for expanding of areas of titanium alloys usage. Design/methodology/approach: In the present work a new approach to coatings deposition onto diffusion hardened in glow discharge plasma (in Ar+O2 atmosphere) Ti6Al4V titanium alloy was proposed by means of a hybrid PVD method including three coatings deposition methods: Reactive Magnetron Sputtering (RMS), Filtered Cathodic Arc Evaporation (FCAE) and Pulsed Cathodic Arc Deposition (PCAD). The main aim of the work was to develop multilayer coatings combined of sublayers of titanium or chromium carbonitrides or of pure, hard carbon ones. Findings: It was concluded from the results of investigations that not every proposed multilayer structure ensure good frictional properties of Ti6Al4V alloy even when the coating posses very high hardness. The lowest value of wear and friction coefficient was determined for multilayer coating with (TiC/C)x3 structure. Research limitations/implications: Further research is necessary for a better understanding of the mechanisms of friction and wear as well as the origin of superhardness of particular multilayers. Practical implications: Multilayer coatings deposited by means of the hybrid PVD technique can be used for low friction and wear protection of titanium alloys. Originality/value: Originality value of this paper consists in use in one process of three different PVD techniques for coatings deposition: FCAE, RMS and PCAD. Moreover, the coatings were deposited onto diffusion hardened by interstitial oxygen atoms Ti6Al4V alloy.