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Open AccessBook Chapter10.1007/978-4-431-55192-8_6

Evaluation of Photocatalytic Activity of the TiO2 Layer Formed on Ti by Thermal Oxidation

Takayuki Narushima,Shota Sado,Natsumi Kondo,Kyosuke Ueda,Mitsuko Kawano,Kouetsu Ogasawara-2014-12-01
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TL;DRAbstract

Two-step thermal oxidation was proposed for Ti and Ti alloys as a surface-treatment process for preparing an anatase-containing TiO2 layer. This process consisted of treatment in a CO-containing atmosphere (first step) and subsequent treatment in air (second step). In this chapter, first, the current status of TiO2 coating onto Ti and Ti alloys for biomedical applications is reviewed; then our recent work on the phase and microstructure of TiO2 layers prepared on commercially pure (CP) Ti, Ti-25mass%Mo alloy, and Ti-25mass%Nb alloy by two-step thermal oxidation is described. The anatase fraction in the TiO2 layer was controlled through process parameters such as the second-step temperature. Finally, photocatalytic activity of TiO2 layers formed on the Ti and Ti alloys is evaluated, including: results of water contact angle, decomposition of methylene blue, and antibacterial effects.

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Two-step thermal oxidation was proposed for Ti and Ti alloys as a surface-treatment process for preparing an anatase-containing TiO2 layer. This process consisted of treatment in a CO-containing atmosphere (first step) and subsequent treatment in air (second step). In this chapter, first, the current status of TiO2 coating onto Ti and Ti alloys for biomedical applications is reviewed; then our recent work on the phase and microstructure of TiO2 layers prepared on commercially pure (CP) Ti, Ti-25mass%Mo alloy, and Ti-25mass%Nb alloy by two-step thermal oxidation is described. The anatase fraction in the TiO2 layer was controlled through process parameters such as the second-step temperature. Finally, photocatalytic activity of TiO2 layers formed on the Ti and Ti alloys is evaluated, including: results of water contact angle, decomposition of methylene blue, and antibacterial effects.

Keywords

AnatasePhotocatalysisMaterials scienceLayer (electronics)MicrostructureThermal oxidationChemical engineeringAlloy

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