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INFLUENCE OF THE NANOSTRUCTURED MULTILAYERED ARCHITECTURE ON THE MECHANICAL PROPERTIES OF TIN-TYPE COATINGS
B. Aprahamian
Abstract: The article examines the changes in hardness, adhesion and cohesion strengths depending on the number of the deposited layers. The coatings of type Ti/TiN/Ti/TiN/..... are obtained in special vacuum technology equipment in The Russe University (type abbreviation VIM-MR/EDI) for nanostructured multilayer coating of protective, decorative and hard wear-resistant coatings based on titanium nitrides. For this purpose is used atmosphere of Ar and N2 at different ratios by arc evaporation of a titanium target. In any regime, coating electrical contact bodies, the same coating was deposited on standard ceramic substrate of 96% Al2O3. The goal is to determine the total thickness of the coating on the indirect method, using the specific density of elements and chemical compounds used in the coating. The mechanical behavior of different types of coatings was studied through nanoindentation. The graphic results demonstrate the dependence of the penetration depth measured in nm, compared to the force in mN. Based on the results the possible resistance to plastic deformation is analyzed - Hpl3/E*2 and wear resistance - Hpl/E* in depth of the coatings. The tribological behavior under static load test is compared to the results of a progressive scratch test for adhesion. The scratch test result is represented as a graph, which is a dependency of the applied force, the penetration depth and the friction force on the length of the scar. During the process of measurement the coefficient of friction μ was also calculated.
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