Effect of Porous Oxide Films on Characterization and Bioactivity of Titanium Niobium Alloy by Electrochemical Treatments
Resource
ECS (The Electrochemical Society) Transactions,3(19),27-36.
Journal
ECS Transactions
Pages
27-36
Date Issued
2007-01
Date
2007-01
Author(s)
Peng, Pen-Wen
Pan, Yung-Ning
Ou, Keng-Liang
Abstract
Titanium-based alloys are widely used as biomaterials for replacing failed hard tissues because of their favorable mechanical properties and excellent biocompatibility. However, the Ti-6Al-4V alloy has the poor capability of wear resistance may release the metallic ions. It may result in the poor osseointegration and then induces clinical failure. Furthermore, the elastic modulus of Ti-6Al-4V alloy (112 GPa) is higher than that of cortical bones (10~30 GPa), which induce the stress shielding effect. Therefore, new titanium alloys that compose of nontoxic and nonallergic elements and good biomechanical compatibility have been studied widely. In the present study, electrochemical treatment was performed to modify the mechanical properties of Ti-Nb alloys. In order to realize the properties of Ti-Nb alloys with and without treatments, the specimens were evaluated by electrochemical measurements and material analyses. The influences of titanium hydride compounds on the formation of porous structural titanium oxide by electrochemical surface treatment was investigated by XPS, TF- XRD, SEM and XTEM. Porous TiO2 film was formed after anodization with cathodic pretreatments. The TiH1.971 is formed by cathodic pretreatments. Furthermore, the porous Ti- Nb formed by dissolution of TiH1.971 wre changed to porous TiO2. The TiH1.971 plays an important role in forming porous TiO2. The anodization with cathodic pretreatment not only produces titanium hydride layer, but also results in formation of porous structural titanium oxide. It is believed that bioactive titanium implant with oxidation and nanostructure can be enhanced and integrated bone interface contact.
Type
journal article