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Abstract
Purpose
The purpose of this study was to investigate the bioactivity of precalcified nanotubular TiO2 layer on Ti-6Al-7Nb alloy.
Materials and methods
Anodic oxidation was carried out at a potential of 20 V and current density of 20 mA/cm2 for 1 hour. The glycerol solution containing 1 wt% NH4F and 20 wt% deionized water was used as an electrolyte. Precalcification treatment was obtained by soaking in Na2HPO4 solution at 80℃ for 30 minutes followed by soaking in saturated Ca(OH)2 solution at 100℃ for 30 minutes, followed by heat treatment at 500℃ for 2 hours. To evaluate the activity of precalcified nanotubular TiO2 layer, specimens were immersed in a simulated body fluid with pH 7.4 at 36.5℃ for 10 days.
Results
1. Nanotubular TiO2 layer showed the highly ordered dense structure by interposing small diameter nanotubes between large ones, the shape of nanotubes was enlarged as going down. 2. The mean length of nanotubes was 517.0 ± 23.2 nm innm glycerol solution containing 1 wt% NH4F and 20 wt% H2O at 20 V for 1 hour. 3. The bioactivity of Ti-6Al-7Nb alloy was improved with formation of nanotubular TiO2 layer and precalcification treatment in 80℃ 0.5 M Na2HPO4 and saturated 100℃ Ca(OH)2 solution.
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