Effect of niobium on corrosion resistance of 75Ti-x-25Ta-xNb alloy
摘要
β-Ti alloys have been developed because have lower modulus than the titanium, which is desirable for orthopedic bone implants. Among the β-Ti stabilizers, Ta and Nb are preferred because of their biocompatibility. This work investigates the effect generated by the addition of Nb into the Ti25Ta alloy on the corrosion behavior under Hank’s solution. The alloys were fabricated by powder metallurgy and conventional sintering that promotes diffusion of Ta and Nb atoms into Ti, which generates a microstructure compose by β-Ti, α’-Ti, α’’-Ti, and α-Ti phases. The corrosion results indicate similar values of all alloys, which confirms that the microstructure is similar no matter the use of either of β-Ti stabilizers. Concluding that Nb will be better for bone implant applications because is lighter than the Ta.
Graphical abstract