Abstract
Anatase-containing TiO2 layers were formed on commercially pure (CP) Ti and Ti–25mass%Mo (Ti–25Mo) and Ti–25mass%Nb (Ti–25Nb) alloys by two-step thermal oxidation. The first-step treatment was conducted in an Ar–1%CO atmosphere at 1073K for 3.6ks, and the second-step treatment was conducted in air at 673–1073K for 10.8ks. The second-step temperature range for anatase formation was wider in the Ti alloys than in CP Ti. Photo-induced superhydrophilicity under UV irradiation was observed for the TiO2 layers with anatase fractions ≥0.6 on CP Ti and the Ti–25Mo alloy, and with anatase fractions ≥0.18 on the Ti–25Nb alloy. The TiO2 layers on the Ti–25Nb alloy exhibited excellent photocatalytic activity in the low anatase fraction region, which is considered to be caused by the incorporation of 1–3at% Nb into the TiO2 layers. The rate constant of methylene blue degradation showed maxima at anatase fractions of 0.6–0.9.
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