METHOD OF PRODUCTION OF ITEMS OUT OF TITANIUM ALLOYS AND ITEMS PRODUCED BY THIS METHOD (VERSIONS) Russian patent published in 2008 - IPC C23C8/36 C23C8/02 A61F2/02 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to production of items out of pseudo-α or (α+β) titanium alloys, designed for continuous operation in friction pairs with polymer or metallic materials and biological tissues. First a stock is produced, then it is subject to thermo hydrogen treatment by means of saturation with hydrogen by thermo diffusion method till concentration of hydrogen reaches 0.5-0.9% in weight at temperature of 700-850°C. Then holding is carried out with successive cooling to an ambient temperature at the rate 0.1-10 deg/sec. Further there is performed firing in vacuum at not less, than 5-10^-5 of mercury column at temperature of 550-700°C with holding within 4-20 hrs till concentration of hydrogen reaches not more, than 0.01 wt %. Polishing is carried out till obtaining of surface roughness parameter of R_a from 0.02 to 0.08 mcm. Then vacuum ion-plasma nitriding is executed at temperature of 300-700°C, till the thickness of nitrated layer is not less, than 50 mcm. With above described method there is produced an item containing nitrated surface layer consisting of nitrides of titanium of composition from Ti₂N to TiN and sub-layer out of solid solution of nitrogen in titanium and a core.

EFFECT: creation of complex process facilitating high wear resistance and low friction ratio, also high corrosion resistance of items in corrosive, including biological, mediums.

17 cl, 2 dwg, 3 ex