At present, the most widely used metal materials for surgical implantation are stainless steel, cobalt-based alloy and titanium alloy. As an emerging metal material, titanium alloy has a strong demand as an alternative implant product for human hard tissue repair due to its advantages of high specific strength, corrosion resistance and good biocompatibility. But now can provide the medical community with very few varieties, titanium alloy (the most used from aviation industry transplanted Ti6Al4V alloy, the alloy containing a metal vanadium and its toxicity has been recognized by the medical profession, moreover this kind of alloy process formability is bad, to the pressure of the material processing and product molding, such as mechanical processing difficult. High strength low modulus biomedical titanium alloy.
A high strength low modulus biomedical titanium alloy characterized in that it is composed of titanium (Ti), niobium (Nb), zirconium (Zr), each group assigned as follows: name weight percentage Niobium (Nb) (31 ~ 34) % Zirconium (Zr) (6 ~ 9) % titanium (Ti) allowance. Compared with the existing technology, it has the following advantages: 1. It does not contain toxic components and has excellent biocompatibility; 2. 2, the alloy strength is high (~ 1050Mpa) and can be adjusted in a wide range to meet the needs of different types of products; 3, the elastic modulus is lower than Ti6Al4V alloy (25 ~ 30) %; 4. The fatigue strength and fracture toughness are better than those of Ti6Al4V alloy; 5, good molding process, elongation rate is 20% higher than Ti6Al4V alloy, compression rate is 30% higher than Ti6Al4V alloy, hot working temperature is low (100℃ ~ 150℃).
With titanium sponge, zirconium sponge and titanium niobium intermediate alloy as raw materials, the design mass of each component is: titanium (Ti)60 kg, niobium (Nb)33 kg, zirconium (Zr)7 kg. After pressing the electrode, it is fused into ingot by secondary vacuum arc melting. The billet is opened at (900 ~ 1050)℃ and processed into bar or sheet at (800 ~ 900)℃. The total deformation is controlled between (65 ~ 95) % and the heat treatment temperature is (500 ~ 800)℃. The above processing technology can be carried out according to the method of prior art.
