METHOD FOR OBTAINING BLANKS OF SUPERELASTIC TITANIUM ALLOYS FOR MEDICAL PURPOSE Russian patent published in 2023 - IPC B22F3/12 B22F9/18 C22C14/00 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to a technology for producing compact billets from superelastic alloys of the Ti-Nb-Zr or Ti-Nb-Ta systems for medical purposes consisting of biocompatible elements, the mechanical behavior of which corresponds to the behavior of a human bone. The method for producing workpieces of superelastic titanium alloys includes hydride-calcium synthesis of a powder mixture at a temperature of 1,100–1,300°C for at least 6 hours, after which the resulting reaction products are treated with water and then with a solution of hydrochloric acid, then the washed powder is dried and classified, and it is consolidated by pressing to form a pressing of the required shape, which is subjected to sintering in vacuum at a residual pressure of not above 10^-4 mm Hg. for at least 2 hours. The powder mixture is prepared from TiO₂, Nb₂O₅, ZrO₂ or from TiO₂, Nb₂O₅, Ta₂O₅ and calcium hydride, and the concentration of niobium in the alloy is set at the level of 14–26 at.%, the concentration of zirconium in the alloy is set at the level of 2–20 at.% or the concentration of tantalum in the alloy is set at the level of 2–14 at.%, titanium — the rest, and the compact is subjected to sintering at a temperature of at least 0.93 of the melting temperature of the alloy.

EFFECT: production of workpieces from alloys based on Ti-Nb-Zr or Ti-Nb-Ta systems with thermoelastic martensitic transformation controlled by chemical and phase compositions with repeatability in alloys of superelastic behavior characteristics is provided.

2 cl, 2 dwg, 6 tbl, 6 ex