Ti-based- Alloy as Biomedical Material

Medical titanium alloy is one of the best known bio-affinity metal, since the 40s of the last century, titanium and titanium alloy gradually in clinical medicine to obtain the application. In 1951, humans began to make bone plates and bone screws with pure titanium. In the mid-1970s, titanium and titanium alloys began to gain a wide range of medical applications, becoming one of the most promising therapeutic materials. At present, titanium and titanium alloy is mainly used in orthopedic surgery, especially the limbs and skull rectification, was used to make a variety of fracture fixation equipment, artificial joints, skull and dura mater, artificial heart valves, teeth, And, crown. Among them, the most widely used titanium alloy is TC4 (Ti-6A1-4V). The alloy has а ten-β mixed structure at room temperature, and its mechanical properties such as strength can be improved obviously by solution treatment and aging treatment.

Medical titanium alloy skull

Titanium and titanium alloy density of 4.5g / cm3 or so, almost only half of stainless steel and cobalt alloy, the density close to the human body hard tissue, and its biocompatibility, corrosion resistance and fatigue resistance are better than stainless steel and cobalt alloy , Is the best metal medical materials. Titanium and titanium alloy and the human body affinity, derived from the surface after the dense titanium oxide (TiO2) passivation film has induced calcium and phosphorus ions in the body to produce apatite capacity, showing a certain biological activity And bone binding capacity, especially suitable for bone implantation. Titanium and titanium alloy shortcomings are low hardness, poor wear resistance. If the wear occurs, it first leads to the destruction of the oxide film, followed by wear of the particles corrosion products into the body tissue, especially Ti-6A1-4V alloy containing toxic vanadium (V) can be expected to result in the failure of the implant. In order to improve the wear resistance of titanium and titanium alloy, titanium and titanium alloy surface can be elevated temperature ionization or ion implantation technology to strengthen its surface wear resistance. In recent years, the development of some new titanium alloy (mainly β-type alloy), is focused on reducing the human body have a certain harm to the elements, such as V and Al, effectively improve the biocompatibility of titanium alloy.