The article is devoted to the analysis of changes in the tribological properties of ship engine piston ring coatings obtained using different coating methods. The analysis of the rate and nature of wear of the coatings of piston rings of a marine internal combustion engine using a multilayer nano structured coating was carried out. Due to the deposition of thin protective coatings with a thickness from several tens of nanometers to several hundreds of micrometers, it becomes possible to achieve improved physical-mechanical, tribological and functional properties of various parts, assemblies and mechanisms, as well as significantly affect the performance characteristics of materials and significantly increase their service life. The experiment was carried out on the example of piston rings of an internal combustion engine, on which a multilayer coating of TiN / ZrN and MoN / CrN was applied. As part of the first experiment, to assess the degree of increase in the wear resistance of rings using equipment of the Bulat type, a multilayer ion-plasma coating of the TiN / CrN system was applied. In the second experiment, a CrN / MoN multilayer coating was carried out, which was deposited by cathode-arc deposition ( Arc-PVD ) using a Bulat-6M vacuum-arc unit. The size of the castle and the coercive force were chosen as the observed parameters. Taking into account the obtained physico-mechanical and tribological properties of TiN / ZrN and MoN / CrN multilayer nano structured coatings, it can be argued that they are promising for further industrial use as protective coatings for metal products operating under high temperatures and under the influence of significant mechanical loads.
piston rings, deposition, ion-plasma coating, durability, lock, cast iron, tribological characteristics
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