F. L. Toma, Fraunhofer Institute for Material and Beam Technology, Dresden, Germany; G. Bertrand, S. Lamy, University of Technology Belfort-Montbeliard, Belfort, France; D. Klein, C. Coddet, University of Technology Belfort-Montbeliard, Belfort Cedex, France; C. Meunier, University of Franche Comte, Montbeliard cedex, France
The suspension plasma spraying is an alternative of atmospheric plasma spraying in which the material feedstock is a liquid (suspension) and that allows to obtain thin and nanostructured coatings.
In this paper it was proposed the elaboration and characterisation of TiO
2 surfaces obtained by the plasma spraying of suspensions starting from different types of titania powders: P25 (Degussa AG), generally considered as a reference for the photocatalytic degradation of the water pollutants, and an anatase PC 105 (Millennium Inorganic Chemicals, France). Distilled water and ethylic alcohol were used as solvents. The suspensions were injected in Ar-H
2 and Ar-H
2-He plasma under atmospheric conditions. The coatings were characterized by SEM, XRD and thermal analysis. The photocatalytic behaviour of the TiO
2 surfaces was evaluated from the conversion rate of nitrogen oxides. Differences in the coatings microstructure and photocatalytic performance were observed and mainly attributed to the anatase phase ratio that strongly depends on the nature of the suspension feedstock.
The suspension plasma spraying is an alternative of atmospheric plasma spraying in which the material feedstock is a liquid (suspension) and that allows to obtain thin and nanostructured coatings.
