Evaluation of Composite TiO_2-FeTiO_3 Coatings Prepared by Plasma Spraying Technique(Materials, Metallurgy & Weldability)

概要

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The composition and photocatalytic activity of plasma sprayed FeTiO_3, TiO_2-30% FeTiO_3 and TiO_2-50% FeTiO_3 coatings were investigated. The influence of FeTiO_3 compound on the charge carrier separation and recombination in TiO_2-FeTiO_3 coatings was clarified. The TiO_2-30% FeTiO_3 coating sprayed under an arc current of 400A, and contained anatase TiO_2, rutile TiO_2 and FeTiO_3, had good photocatalytic activity because the coating did not contain the unfavorable Fe_2TiO_5 phase. However, the relative deposition speed of TiO_2-30% FeTiO_3 powder under an arc current of 400A approximated to 4μm/pass, which was very low. Although pure FeTiO_3 compound nearly did not show photocatalytic performance, the existence of FeTiO_3 could improve the photocatalytic activity of anatase TiO_2 if FeTiO_3 contacts coherently with TiO_2, and this was explained using a two-steps electron transfer model.
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