Maltsev T. Improving the tribotechnical properties of piston rings by multilayer hardening with nanostructured coating

The dissertation is devoted to studying the influence of the hardening technology of oil scraper piston rings of special engines with multilayer ion-plasma nanostructured TiN/CrN coatings, also to choice and analysis of Ti/Cr optimal ratio. A decrease in the rate of their wear at various sliding speeds, which contribute to maximum changes, was revealed. An assessment of the change in their microhardness before and after the tests was performed. A method for assessing and controlling the degree of heterogeneity of the stress-strain state of piston rings before and after hardening by an ion-plasma coating is proposed and used. A local X-ray microspectral analysis revealed the nature of changes in structure and composition at various test parameters on the friction surface. Estimating the residual thickness of an ion-plasma coating after operating rings is performed. By the method of optical-mathematical analysis, the features of structuring the friction surface are described.