Abstract

Titanium (Ti) coatings on alumina (Al2O3) balls fabricated by mechanical coating technique (MCT) were oxidized at relatively low temperatures. Crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed. The results showed that TiO2 films on Ti or Ti/TiO2 coatings were fabricated by the MCT and subsequent heat oxidation. The TiO2 is anatase phase if the heat oxidation temperature is under 773 K. The TiO2 is the mixed phases of anatase and rutile if the heat oxidation temperature is in the range of 673–973 K. Besides, rutile TiO2 is formed if the heat oxidation temperature is beyond 1073 K. Photocatalytic activity of anatase TiO2 is higher than rutile TiO2.

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