METHOD FOR OBTAINING POROUS AND PERMEABLE RING-SHAPED BLANKS FROM A SUPERELASTIC TITANIUM-ZIRCONIUM-NIOBIUM SYSTEM ALLOY Russian patent published in 2022 - IPC C22C1/08 C22C14/00 B22F3/11 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to powder metallurgy, namely to the production of a ring-shaped material with open porosity and permeability, which can be used by spinal surgery as implants for the replacement of intervertebral discs and vertebral bodies. The method for obtaining porous and permeable blanks from Ti-18Zr-15Nb alloy system, at. %, includes screening of metal powder fractions from 10 to 50 microns, sieving polymethylmethacrylate powder into fractions from 50 to less than 160 microns and from 160 to 250 microns, obtaining a mixture of powders in the following component ratio, wt. %: polymethylmethacrylate fraction from 50 to less than 160 microns 4-6, polymethylmethacrylate fraction from 160 to 250 microns 16-24, the fraction of metal powder from 10 to 50 microns is 80-70, by mixing in a mixer for 20-30 minutes at an angle of 20-25° to the horizon, subsequent quasi-double-sided pressing at a pressure of 125-150 MPa into annular blanks with a height-to-outer diameter ratio of no more than 2 and a height-to-wall thickness ratio of no more than 4, and then pyrolysis with an exposure of 60-75 minutes at temperatures of 345-355°C and 445-455°C and a pressure of no more than 0.001 tor, then sintering at a temperature of 1340-1350°C for 3-4 hours and a pressure of no more than 0.0001 torr.

EFFECT: invention provides the production of highly porous ring-shaped products imitating the shape of a spinal cage, with a pore content of 100-800 microns larger than 60% of the total volume, a low value of the Young’s modulus of 5-15 GPa, a high compressive strength of at least 100 MPa and a permeability from 40×10^-11 m² to 90×10^-11 m².

1 cl, 2 ex