PROCEDURE FOR CREATION OF MACRO NON-UNIFORM STRUCTURE OF MATERIAL AT NITRIDING Russian patent published in 2011 - IPC C23C8/36 C23C14/06 C23C14/24 

FIELD: metallurgy.

SUBSTANCE: procedure for treatment of parts out of titanium alloys consists in cathode sputtering and nitriding. Before and after nitriding parts are annealed in vacuum. For nitriding there is supplied mixture of gases consisting of 10 wt % of nitrogen and 90 wt % of argon. Further, parts are vacuum heated in non-uniform plasma of higher density which is created between a part and a screen due to effect of a hollow cathode. Thus there is facilitated formation of regular macro non-uniform structure. Structure of cells of the screen is honeycomb-like. Parts are annealed before and after nitriding at temperature 800°C during 2 hours, while nitriding is carried out at temperature below α→β of transition of titanium alloy.

EFFECT: increased contact durability and wear resistance of hardened layer due to creation of regular macro non-uniform structure of material, expanded functionality of described procedure.

2 cl, 4 dwg, 2 ex