Influence of Niobium or Molybdenum in Titanium Alloy for Permanent Implant Application

Titanium (Ti) alloy metal has been used for permanent implant in the human body. Its high strength and hardness take place due to the  phase formation at room temperature. Ti-6 persenAl6 persenV alloy is most popular, of which vanadium (V) content is used as the beta-phase stabilizer. However V can induce allergic reaction from the body. V can be substituted by other element, suchas Mo and Nb. Microstructure observations for Ti-6 persenAl-6 persenMo and Ti-6 persenAl-6 persenNb alloys show that beta-phase exists as matrix having good workability at room temperature. After preheat at 1000 C, no cracking failure occurs during forging and rolling treatment. Thermal spray method is used for CaPO4 surface treatment. A CaPO4 layer on the alloy substrate forms after the molten CaPO4 is hot sprayed on to the alloy substrate surface. Corrosion test results indicate that the increase in Mo or Nb content up to 6 persen leads to the increase in corrosion resistance. Advanced Materials Research Vol. 900 (2014) pp 53-63 © (2014) Trans Tech Publications, Switzerland