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Wednesday, 18 September 2019
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Raw materials & technologies, Science today - coatings tomorrow

Oxidation process influences activity of photocatalytic coatings

Tuesday, 11 November 2014

Titanium (Ti) coatings on alumina (Al2O3) balls fabricated by mechanical coating technique (MCT) were oxidised in air at a series of relatively low temperatures with the oxidation time of 3 and 50h.

The oxidised coatings started to show the mixed-phase of anatase and rutile, at the temperature of 873K for 3h and 773K for 50h. Source: Dupont

The oxidised coatings started to show the mixed-phase of anatase and rutile, at the temperature of 873K for 3h and 773K for 50h. Source: Dupont

Crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed.

Showing the mixed-phase of anatase and rutile

The results showed that titanium dioxide (TiO2) films on Ti or Ti/TiO2 coatings were fabricated by the MCT and subsequent heat oxidation. The oxidised coatings started to show the mixed-phase of anatase and rutile, at the temperature of 873K for 3h and 773K for 50h. With extending the oxidation time from 3h to 50h, the oxidative effect of relatively lower temperatures of 773K to 973K almost reached to that of higher temperatures, which is similar to the time-temperature equivalence principle. Photocatalytic activity of anatase TiO2 at 673K is higher than that of mixed-phase or rutile TiO2 under UV irradiation.

The study is published in: Materials Science in Semiconductor Processing, Volume 30, February 2015, Pages 128-134.

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