Preparation and Properties of Ti/TiO₂/BGC Bioactive Composite

Nano-TiO₂ layer was prepared by in-situ growth on pure titanium matrix via anodic oxidation method,then the bioactive glass coating（BGC） was clad on the nano-TiO₂ layer through sol-gel method.Employing SEM,XRD,scratch test and human body fluid simulation test,the morphology and phase,biological activity of the coating were studied and evaluated respectively.Furthermore,the effect of CaF₂ molar fraction on bonding force of the coating was also investigated.The results show that after introduction of nano-TiO₂ layer the contact angle of the titanium matrix surface decreases with the hydrophilic ability increased,resulting 27% of rise for the binding force between the coating and titanium matrix.The maximum binding force between the coating and titanium is determined at 64 N when the CaF₂ content is 4%.After soaking in the simulated body fluid for 7 days,abundant hydroxyapatite can be generated on the surface of Ti/TiO₂/BGC composite.