Widely used in medical field is still titanium bar grade 5 Ti 6 al 4 v ELI alloy. But the latter will precipitate extremely trace vanadium and aluminum ions, adaptability and reduce its cells may cause harm to human body, this problem has already caused extensive concern of the medical profession. Qiang nation in the early 1980 s had been making aluminum, titanium electrode alloy of vanadium, with biocompatibility to be used in orthopedics. Also, such as Japan and Britain, a lot of research work has been done in this aspect, and made some new progress. Japan, for example, have developed a series of excellent biocompatibility of alpha + beta titanium electrode alloys, including Ti 15 nb_4ta zr - 4-0.2 - Pd nb, Ti and zr - 4 - aTa Pd - 0.2-0.20 ~ 0.05 N, Ti - 15 nb sn - 4-0.2-2 ta Pd and Ti - 15 nb sn - 4-2 ta Pd - 0.2-0.20, these alloy corrosion strength, fatigue strength and corrosion resistance are better than Ti 6 al 4 v ELI. Compared with the alpha + beta titanium electrode alloy, beta titanium electrode alloy has a higher strength on the water, and better performance of incision and toughness, better suited to as implants implanted in the body. In the United States, five kinds of beta titanium electrode alloy is recommended to the medical field, namely TMZFTM (TI - 12 mo - ^ Zr - fe) 2, TI and Nb - 13 Zr, Timetal 21 SRX (TI - 15 mo Nb - 0.2-2.5 Si), Tiadyne 1610 (TI - 16 Nb - 9.5 Hf) - 15 mo and TI. Estimates that in the near future, this kind of high strength, low modulus of elasticity and excellent formability and corrosion resistance of the dormant titanium electrode alloy is likely to replace the current widely used in medical field Ti 6 al 4 v ELI alloy.
Due to corrosion related to the material surface and the environment, in the design and processing of medical titanium electrode alloy implants must also pay attention to when to improve the apparent quality of materials, such as improve titanium filler rod the roughness, avoid products in shape, mechanical design and material compatibility in wrong way. 213? Titanium electrode alloy elements added to the influence of the mechanical properties of alloy element Zr, Sn, Nb, Ta, the content of Pd for R012, tensile strength, elongation and reduction of area is shown in figure 1. From figure 1, the rise with the Sn, Zr to add strength. Sn to add to the strength of the effect is very significant, and Zr content > 15% of strength increase contribution is very small. B phase stable elements Nb, Ta, and B phase eutectoid element Pd's contribution to the strength is very small. The Titanium 6Al4V wire total elongation and reduction of area relative to the change of the alloy composition basically remain unchanged, but when the Sn and Zr content > 15%, the two values have dropped sharply. 60 metal heat treatment, 30, 2005 (9) 3? The influence of mechanical properties of biocompatibility of 311? The nickel titanium wire elastic modulus of biocompatibility of the titanium electrode alloy elastic modulus is the influence of biomedical metal materials, especially one of the most important physical properties of bone substitute materials. If the elastic modulus of the metal is relatively titanium seamless tube high bone, under the effect of stress, the stress of the metal