The paper presents the properties of diamond-like carbon (DLC) coatings deposited by PVD technique. Their properties were determined by the analysis of the structure and texture of the films and by hardness and tribological testing. The hardness of coated and uncoated parts was measured using a Matsuzawa microhardness tester. The coating structure was analyzed based on the topography of the surface and observation of the cross-sections with the aid of a JSM 7100F scanning electron microscope and EDS X-ray microanalysis. The results were used to determine the elementary composition, phase distribution and thickness of the coatings. Analysis of the chemical composition of the elements present in the samples was performed. The surface topographic maps were developed using the Talysurf CCI Lite optical profilometer. The wear resistance was established under dry friction conditions using a ball-on-disc tribometer, with the ball being made of 100Cr6 steel or 100Cr6 steel coated with DLC and with the disc being made of the 100Cr6 steel coated with DLC. The experimental data indicate that DLC coatings improve the service life of components. The results of structural analyses and tribological tests of DLC coatings were compared with those obtained for the substrate material, i.e. steel. The study aimed at assessing how the coating and the material used for the counter samples, i.e. a steel ball and a DLC ball affect the tribological properties of the parts operating under dry conditions. Compared with the substrate material (steel), the diamond-like carbon coatings showed lower linear wear, lower friction coefficient and higher hardness.Keywords: Diamond - like carbon coatings, SEM, friction, wear
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