Autori: F.L. Toma, D. Sokolov, G. Bertrand, D. Klein, C. Coddet, C. Meunier

Editorial: Proceedings of the 2006 International Thermal Spray Conference, May 15-18, Seattle, Washington, USA, 2006.

Rezumat:

Cuvinte cheie: high-velocity oxyfuel, nitrogen oxides, photocatalysis, photocatalytic activity, plasma spraying, suspension plasma spraying, TiO2

Autori: Toma, Filofteia-Laura; Sokolov, Dmitry; Bertrand, Ghislaine; Klein, Didier; Coddet, Christian; Meunier, Cathy

Editorial: Journal of Thermal Spray Technology, 15 (4), p.576-581, 2006.

Rezumat:

This paper proposes a comparative study on the microstructure and photocatalytic performances of titanium dioxide coatings elaborated by various thermal spraying methods (plasma spraying in atmospheric conditions, suspension plasma spraying, and high-velocity oxyfuel spraying). Agglomerated spray dried anatase TiO2 powder was used as feedstock material for spraying. Morphology and microstructural characteristics of the coatings were studied mainly by scanning electron microscopy and x-ray diffraction. The photocatalytic behavior of the TiO2-base surfaces was evaluated from the conversion rate of gaseous nitrogen oxides (NOx). It was found that the crystalline structure depended strongly on the technique of thermal spraying deposition. Moreover, a high amount of anatase was suitable for the photocatalytic degradation of the pollutants. Suspension plasma spraying has allowed retention of the original anatase phase and for very reactive TiO2 surfaces to be obtained for the removal of nitrogen oxides.

Cuvinte cheie: HVOF, plasma spraying, suspension plasma spraying, photocatalysis, photocatalytic activity, TiO2, NOx