Features of Wear Resistance in Tribological Contacts with Textured Surfaces under Boundary Friction Conditions

The features of wear resistance of tribological contacts with a textured surface under boundary friction conditions have been investigated. A mathematical modeling of the behavior of the lubricant in the dimple was conducted, considering the influence of inertial forces. It is shown that the dynamics of the "oil droplet" depend on the value of the parameter α, which represents linear acceleration. A critical value of the parameter α<0 was established, below which additional wetting of the tribocontact surface with oil from the dimple becomes impossible. At α=0, the process of additional wetting with oil is determined solely by the oil droplets particles located near the dimple surface. At α>0, oil particles leave the dimple and contribute to the regeneration of the boundary lubricant film. Experimental studies on the wear resistance of tribological contacts with a textured surface under boundary friction conditions have been carried out. High wear resistance of textured surfaces, additionally reinforced by ion-plasma thermocyclic nitriding, has been established. These surfaces exceed the wear resistance of other samples by 1.45–3.0 times due to stress redistribution, higher mechanical properties of the surface layer that inhibit defect formation in the tribocontact surface layer, and the high protective effect of the boundary lubricant film.