Surface modified Ti based metallic glasses for bioactivation by electrochemical treatment technique

Abstract

The aim of this study is surface modification of Ni-free type Ti based metallic glass (Ti42Hf11Cu11Pd36at.%) for increasing calcification by electrochemical treatment. Ni-free type Ti based metallic glass has excellent mechanical and chemical properties which are comparable with those of Ti based alloys. Surface of Ti based metallic glasses was prepared as follows; one is anodically-oxidized porous layer by potentiostatic control in 5M NaOH solution at 25°C for 2h, and the other is simple hydrothermal treated poros layer by immersion in 5M NaOH solution at 60°C for 24h. The synthesized surface structures were characterized by X-ray diffraction (XRD) identification, SEM observation, energy dispersive X-ray spectroscopy (EDS) analysis and Auger electron spectroscopy (AES) analysis. These surfaces on the modified specimens have nano-mesh laminated structures and are consist of sodium titanate and titanium oxide. In addition, the above two types surfaces with nano-mesh laminated layer were immersed in Hank’s balance salt solution (HBSS) at 37°C for 21days for evaluation of calcification. The apatite-forming ability on these surfaces is observed by SEM observation and EDS analysis. As stated above surface modifications are also discussed about calcification effect by different surface treatment and different formability of porosity in this study.