Structure and tribological properties of gradient-layered coatings (Ti, Al, Si, Cr, Mo, S) O, N

In order to search for new compositions and structures of wear-resistant and protective coatings, the study of multi-element gradient-layered coatings (Ti, Al, Si, Cr, Mo, S) O, N has been carried out. Using the methods of scanning, transmission electron microscopy, X-ray photoelectron spectroscopy, indentation, scratching and tribotesting, the composition, structure, and mechano-tribological properties of the coatings were studied. It was found that the pattern of the deformation relief of the wear track corresponds to various scales and mechanisms of destruction, from uniform destruction of the nanocrystalline layer to large fracture centers containing areas of substrate deformation, destruction and coating spatting, thick amorphous surface tribofilms of wear products. In general, the results obtained indicate an abrasive-oxidative wear mechanism. An increase in the level and heterogeneity of elastic strains and stresses, expressed in the development of a rotational deformation mode along the boundaries of nanocrystals, in the surface layer of the friction zone is established. In connection with the study of the phase composition of the friction zone, it was suggested that oxygen saturation significantly affects the decomposition of the phase of doped titanium nitride into amorphous wear products.

Automated summary

The study investigated multi-element gradient-layered coatings to search for new compositions and structures of wear-resistant coatings, finding that oxygen saturation significantly affects the decomposition of the phase of doped titanium nitride into amorphous wear products. This suggests an abrasive-oxidative wear mechanism, with an increase in the level and heterogeneity of elastic strains and stresses in the surface layer of the friction zone.