Development of Sinered Titanium Alloy as a Biomaterial

用极化曲线研究了HIP‘ED钛合金在310K生理盐溶液和310K 1N-HCl溶液中的腐蚀行为，并与HIP’ED的Ti-6Al-4V和HIP‘ED的Ti-5Al-2.5Fe合金进行了比较。并对在310K的生理盐水溶液中形成的钝化膜进行了XPS分析。在1N-HCl溶液中的极化曲线测量过程中或在2.4V的生理盐水溶液中形成钝化膜的过程中，观察到了Ti-6Al-4V和Ti-5Al-2.5Fe样品表面的局部侵蚀(腐蚀)。然而，在Ti-4Fe试件上没有检测到上述局部化攻击。扫描电子显微镜观察发现，在Ti-6Al-4V和Ti-5Al-2.5Fe的钝化膜中，含Al的α晶相优先被侵蚀，Al被富集。在兔胫骨内放置12个月的植入试验中，未检测到钛、钴、铁等合金元素的淋洗。

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.