Elastic medical beta titanium alloy powder suitable for 3D printing and preparation method and application thereof

Abstract

The invention provides medical beta titanium alloy powder suitable for 3D printing and a preparation method and application thereof. The elastic medical beta titanium alloy powder is composed of, by mass, 18-30% of Nb, 0.2-1.5% of ReSi2 and the balance Ti, and ReSi2 is selected from one of YSi2, LaSi2, NdSi2 and ErSi2; and the powder is prepared by an electrode induction melting gas atomization method (EIGA), that is, alloy is smelted by a medium-frequency induction furnace and cast into a mold to obtain a consumable electrode, and then powder is prepared by argon atomization. The particle size of the powder is-300-1000 meshes, and the yield of qualified powder is not lower than 50%. The rare earth is adopted to capture free oxygen in the alloy, the plasticity and the superelasticity are improved, the alloy has an excellent shape memory effect, when the tensile pre-strain is less than 5%, the recoverable strain rate after unloading exceeds 90%, and a finished product prepared by the method can meet the requirements of medical materials such as stents and dental or orthopedic joints.

Description

technical field [0001] The invention belongs to a method in the technical field of preparing titanium alloy powder, and mainly relates to an elastic medical β-titanium alloy powder suitable for 3D printing and its preparation method and application. Background technique [0002] The density of titanium alloy is only 50-60% of that of traditional stainless steel, its strength is not lower than or even better than stainless steel, and it also has better corrosion resistance and biocompatibility. At present, it has gradually replaced stainless steel, cobalt chromium and other Materials play a huge role in the field of biomedicine. Among all kinds of titanium alloys, Ti-Nb-based alloys not only have the low elastic modulus of ordinary β titanium alloys, but also have better biocompatibility and corrosion resistance, and also have phase transition superelasticity (or shape memory effect). . This type of alloy will deform under the action of external force, but after heating to ...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN106148760 B specifically describes a Ti for 3D printing 25 NbTa 1 Zr x R alloy powder is used in the medical field, but only its strength and elastic modulus are described, and the plasticity and shape memory effect are not described, which cannot solve the problem of low plasticity and difficulty in achieving superelasticity of titanium alloy 3D printed parts.

However, it can be found that although the patent has added rare earth elements to avoid the influence of impurities, the alloy provided by the patent still contains a relatively high oxygen content, which shows that pure rare earth elements are still easy to oxidize, and the particles are too large

Because it is difficult for oxygen to penetrate the film layer of rare earth oxide, it is difficult to oxidize the large particles of rare earth metal during the sintering time, so that the particles present the shell-core structure of oxide film / rare earth metal, which not only results in low oxygen absorption efficiency, but also softer Rare earth metals will reduce the mechanical properties of the alloy

Images