METHOD FOR OBTAINING LAYERED COMPOSITE COATING Russian patent published in 2018 - IPC C23C24/04 C23C4/129 C23C4/67 B82Y30/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metal science, namely, to the chemical-thermal treatment of metal products, to the creation of structural nanostructured materials, to the solution of the problem of friction and wear, and can be used to improve the durability of machine parts in any industry. Method for high-speed flame spraying of a multilayer coating of powder materials onto a metal article in a protective atmosphere includes mechanical activation of the powders, application of a lower layer of mechanically activated powder, a middle layer of a mechanically activated powder with a TiNiZr-based shape memory effect, a top layer of a mechanically activated mixture of powders, and annealing. Lower layer is represented by mechanically activated TiNi-based powder of equiatomic composition with a thickness of 1,000–1,500 mcm at room temperature in the austenitic state. Top layer is represented by a mechanically activated mixture of powders cNB-Co-Mo-TiNi-TiNiZr with the following ratio of components, wt.%: cNB 62–74, Co 6–10, Mo 8–10, TiNi 6–8, TiNiZr 6–10 thickness of 200–600 microns. After the lower layer is sprayed, a complex treatment is carried out, including surface plastic deformation and contact spot welding, and after application of the middle and top layers, a combined treatment of surface plastic deformation and ultrasonic hardening is carried out. Annealing is carried out at a temperature of 500–700 °C for 3–4 hours in a protective atmosphere of argon.

EFFECT: increase in the adhesion between the substrate and the composite, as well as between the layers of the composite, obtaining ultrafine-grained structure, high mechanical properties of the composite, high resistance to cavitation wear and implementation of deformation and dispersion hardening of the material are ensured.

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