Tribological Properties of Films Coated on CP-Titanium and CoCrMo Alloy by Cathodic Arc Deposition Method

The improvement of tribological properties of biomaterials in load-bearing implants is very important. In this study, the tribological properties of TiN and ZrN films deposited on surfaces by CA-PVD method on two different types of biomaterials (CP-Ti and CoCrMo alloy) were compared under dry wear conditions and 1N and 3 N loads. In addition, the microstructural and mechanical properties of TiN and ZrN films deposited on the surface on CP-Ti and CoCrMo materials were investigated. The crystal structure, elemental composition and surface morphology of TiN and ZrN coated CP-Ti and CoCrMo materials were determined using XRD, SEM and SEM-EDS analyses, respectively. According to the test results conducted in a dry environment after the wear test under 1N load, the lowest friction coefficient was found in the untreated CoCrMo sample at approximately 0.35, while the highest friction coefficient was found in the ZrN-coated CoCrMo sample at 0.55. While the lowest wear rate under 3N load was 0.38x10-6 mm3/Nm in the ZrN/CCM sample, the highest wear rate was 2.10x10-6 mm3/Nm in the untreated Ti sample. As a result, it was determined that the microhardness values and wear resistance of the TiN and ZrN-coated CP-Ti and CoCrMo samples increased.