Tribological behavior and wear mechanism of film electrolytic nanocomposites based on nickel and mixed tungsten and molybdenum oxides

It is shown that the electrolytic co-deposition of nickel and ultradispersed particles of mixed tungsten and molybdenum oxides changes considerably the coating morphology at both the nano- and micro-level. Under boundary lubrication at the pressure of 1 MPa the pair Ni-MoO3·WO3 — hardened steel operates at the stationary regime which is characterized by the constant friction coefficient f = 0.28 ± 0.01 and the minimal wear of the pair. At dry friction abrasive wear dominates. Decrease in the pressure from 70 to 2.5 MPa during friction results in the equilibrium structure of the friction surface with the fractal dimension of the profile tending to 2.