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MULTILAYERED NANOSTRUCTURED PVD COATINGS DEPOSITED ON ELECTRICAL CONTACTS STRUCTURE AND PROPERTIES
B. Aprahamian, V. Zaharieva, M. Nikolova, Al. Gaydardzhiev
Abstract: A modern trend is to apply nanostructured multilayered coatings on various substrates. The methods for protective coatings deposition in high vacuum prevails the ARC method and its specificity provides good looks and very good adhesion of the coating to the substrate, uniformity of coating thickness on both the flat and on complex surfaces. Multilayered coatings on base of titanium substantially improve the performance characteristics of coatings and for their deposition have been developed entirely new technologies. Coatings of type Ti/TiN/Ti/TiN/..... are deposited on the contact bodies of an electrical contactor K6E in special vacuum technology equipment in The Russe University (type abbreviation VIM-MR/EDI). The equipment is suitable for application of nanostructured multilayered protective and decorative and hard wear-resistant coatings based on titanium nitrides. The latter are obtained in an atmosphere of pure Ar and N2 in various ratios by arc evaporation of titanium target. The goal is to achieve a high wear resistance of the surface of the contact body, due to the specific physical properties of the nanostructured layers. An qualitative X-ray analysis of the phase structure is made and the coefficient of texture formation is calculated. The topography of the samples is investigated optically and reproduced with the software Image J, and the microstructure - through microscopic observation in the transverse direction. To study the mechanical stability a test is conducted using the Ball - wear method. The electrical wear resistance of the coating is also investigated by spark discharge application on the contact body’s surface.
Keywords: electrical and mechanical wear resistance; nanostructured multilayered coatings; TiN-type coatings