METHOD OF APPLYING AN EROSION-RESISTANT COATING ONTO THE SURFACE OF A STEEL BLADE OF A STEAM TURBINE Russian patent published in 2020 - IPC C23C14/35 C23C14/06 C23C14/02 

FIELD: machine building.

SUBSTANCE: invention relates to power engineering and can be used for protection against erosion wear of steel working blades of wet-steam stages of turbines exposed to high-speed drop-impact action in corrosion-active media at increased fatigue loads. Method for application of coating on surface of turbine blade includes electrolytic-plasma polishing of blade surface, its arrangement in vacuum chamber, in which magnetron with target of chromium is installed, heating of vacuum chamber and pumping of air from it, cleaning and etching of blade surface with ions of inert gas, periodic supply of reaction gas into vacuum chamber and formation on said surface of even number of alternating chromium microlayers and chromium compound, wherein hydrocarbon gas is used as reaction gas, microlayers of chromium compound are formed in form of chromium carbide with thickness of 1.4±0.6 mcm, chromium micro-layers with thickness of 0.45±0.15 mcm, with total number of micro layers in range from 6 to 10 and controlling flow of hydrocarbon gas from condition of total concentration of carbon atoms in coating 3.25±0.25 at. %.

EFFECT: technical result consists in increasing the service life of the applied erosion-resistant coating by increasing its corrosion resistance and fatigue strength.

1 cl, 3 tbl