Production of Titanium Oxide Layers on Woodceramics by Plasma Thermal Spraying

概要

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The anatase titanium oxide (TiO2) powders were coated on the woodceramics, which were made from radiata pine wood fiberboards carbonized at 923 K, by means of three electrodes type-plasma thermal spraying in air, in which plasma was ejected from each electrode. Water-resistant and photocatalytic performances of TiO2 coated woodceramics were investigated. Both the rutile and the anatase TiO2 were produced after thermal spraying. A lower power thermal spraying produced much amount of anatase TiO2. The water-resistant performance for the woodceramics was improved by thermal spraying and thermal spraying with a lower power much improved this performance. The photocatalytic performance determined from concentration variations of ethanol in a vessel during an ultra violet light exposure to the woodceramics indicated that the concentration decreased much faster (about 85 % decrease in 4 h) for the woodceramicas after thermal spraying. It is indicated that photocatalytic performance was improved by thermal spraying.
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