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2118 |
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Monday, May 03, 2010, Moor Room 3:40 PM Biomedical Coatings |
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Evaluation of the photocatalytic activity of TiO2-coatings prepared by different thermal spray techniques |
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Henning Gutzmann* / Helmut-Schmidt-University of the Federal Armed Forces, Germany Filofteia-Laura Toma/ Fraunhofer Institute Material and Beam Technology (Fh-IWS), Germany Jan-Oliver Kliemann/ Helmut Schmidt University, Germany Julia Stötzner/ University of Hannover, Germany Lutz-Michael Berger/ Fraunhofer Institute Material and Beam Technology (Fh-IWS), Germany B. Leupolt/ Fraunhofer Institute Material and Beam Technology (Fh-IWS), Germany Frank Gärtner/ Helmut Schmidt University, Germany Thomas Klassen/ Helmut Schmidt University, Germany |
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The present work proposes a comparative study on the photocatalytic activity of TiO2 coatings prepared with different spray methods: conventional atmospheric plasma spraying, HVOF-spraying, suspension spraying and cold spraying. An initial anatase powder was used as material feedstock and the spray parameters were optimized in order to obtain coatings with high photocatalytic performance. With respect to spray technique and spray conditions different amounts of the photocatalytic active anatase phase could be retained. The photocatalytic activity of coatings was evaluated by three methods: removal of gaseous nitrogen oxides, decomposition of liquid dichloroacetic acid and decolourisation of aqueous solution of methylene blue dye. The results show that photocatalytic activity is highly dependent on spray technology. Functional properties and coating microstructures obtained by the different spray methods are elucidated under viewpoints of possible industrial applications. |