Development of Sinered Titanium Alloy as a Biomaterial

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The corrosion behavior of the HIP'ed Ti-4Fe alloy using hydride kroll process titanium powders as titanium sources was studied by the polarization curve in the physiological salt solution at 310K or in 1N-HCl solution at 310K in comparison with HIP'ed Ti-6Al-4V and HIP'ed Ti-5Al-2.5Fe alloys which are considered as the promising candidate for the implant material, and XPS analysis was carried out for the passive film formed on the surface of specimen in the physiological saline solution at 310K.The localized attack (corrosion) was observed on the surfaces of the Ti-6Al-4 V and Ti-5Al-2.5Fe specimens during measurement of polarization curve in 1N-HCl solution or during forming passive film at 2.4V in the physiological saline solution. The above mentioned localized attack, however, was not detected on the Ti-4Fe specimen. It was recognized by SEM observation that alpha grain containing Al has been preferentially attacked and Al was enriched in the passive film of Ti-6Al-4V and Ti-5Al-2.5Fe specimens.In the implantation test maintained in the tibia of a rabbit for 12 months, elution of alloying element such as Ti, Co, Fe was not detected.