Fabrication and Photocatalytic Activity of Photocatalyst Coatings by Mechanical Coating Technique and the Oxidation at Relatively Low Temperatures

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.

• Periodical: Applied Mechanics and Materials (Volumes 719-720)
• Pages: 17-20
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.719-720.17
• Online since: January 2015
• Authors: Yun Lu*, Liang Hao, Kohta Kobayashi, Hiromasa Sato, Hiroyuki Yoshida, Su Jun Guan, Jin Xiang Chen
• Keywords: Composite Coating, Heat Oxidation, Mechanical Coating Technique, Photocatalytic Activity, TiO₂

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