METHOD FOR HARDENING BLADES OF MONOWHEEL MADE OF TITANIUM ALLOY Russian patent published in 2019 - IPC C23C14/48 C23C14/16 C23C14/24 F01D5/28 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for hardening the blades of a monowheel made of a titanium alloy. Method includes ion-implantation processing of the material of the surface layer of the blades with energy from 20 keV to 35 keV and a dose of 1.6⋅10¹⁷ cm^-2 up to 2.0⋅10¹⁷ cm^-2 with the subsequent application of an ion-plasma multilayer coating with a specified number of pairs of layers. Layers of titanium with vanadium are applied with a thickness of 0.15 mcm to 0.25 mcm, layers of titanium compounds with vanadium and nitrogen – with a thickness of 1.2 mcm to 2.3 mcm with a total thickness of the multilayer coating from 7.0 mcm to 11.0 mcm. Before ion-implantation treatment, electrolyte-plasma polishing is carried out at a voltage of from 280 V to 300 V, in an aqueous solution with a content of from 5 to 8 wt. % of hydroxylamine hydrochloric acid and KF from 0.7 to 0.8 wt. %. When applied, the monowheel is rotated simultaneously with respect to its longitudinal and transverse axes, simultaneously giving the monowheel oscillatory movements about its transverse axis. Application of titanium and vanadium on the blades is carried out simultaneously with the electric arc evaporator for titanium and the electric arc evaporator located opposite it for vanadium.

EFFECT: as a result, a monowheel is obtained with protection of blade feathers from erosion destruction, while at the same time increasing their endurance and cyclic durability.

5 cl