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Photocatalytic properties of nanostructured TiO2 and TiO2-Al coatings elaborated by HVOF spraying

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: F.-L. Toma, S.O. Chwa, G. Bertrand, H. Liao, D. Klein, C. Coddet

Editorial: DVS-Verlag, ITSC 2005: Thermal Spray Connects: Explore its Surfacing Potential!, 2005.


In the present study, TiO2 and TiO2-Al composite coatings were prepared by HVOF spraying using reconstituted
nanosized feedstock powders prepared via the spray drying technique. In the flame, the powders were injected by
two methods: internal injection i.e. as in conventional HVOF process and external injection i.e. outside the torch nozzle. The microstructure of the coatings was characterized by scanning electron microscopy and X-ray
diffraction. It was found that the amount of anatase in the coatings depends on the nature of the powder and also on the type of the injection method. The coatings were tested for their photocatalytic properties regarding the
conversion rate of nitrogen oxides. Coatings elaborated by external injection presented a better photocatalytic activity than those obtained by the conventional HVOF process.

Cuvinte cheie: TiO2, TiO2-Al, HVOF, photocatalysis, NOx removal