Comparative study of tribological properties of nanocomposite and nanolayer coatings containing low-friction MoSx and solid a-C(S,H) components

Abstract

Reactive pulsed laser deposition was used to create solid lubricating coatings differing in the dimensions of MoSx and a-C(S,H) nanophases in the bulk of the coatings. For coating preparation, two deposition modes were used, including the co-deposition of Mo and C atomic fluxes in hydrogen sulfide and the successive deposition of Mo and C layers up to 12 nm thick in hydrogen sulfide. The two-phase composition of the coating formed by the co-deposition of Упрочняющие технологии и покрытия. 2022. Том 18, № 10 471 Strengthening technologies and coatings. 2022. Vol. 18, no. 10 УПРОЧНЯЮЩИЕ НАНОТЕХНОЛОГИИ atomic flows was recorded only by the method of micro-Raman spectroscopy. No fundamental difference in the tribological properties of these coatings was found during tests in humid and dry air, although some important differences in tribochemical processes on the surface of the coatings were revealed. The use of the technique of alternating deposition of thin layers of controlled thickness and composition opens more opportunities for controlling the nanostructure and phase composition of this type coatings than with the co-deposition of atomic flows. However, the successful implementation of the layer-by-layer deposition technique largely depends on the degree of adhesion between the nanolayers.