Fabrication of TiO_2 Photocatalytic Coatings on PET by Plasma Spraying(Materials, Metallurgy & Weldability, INTERNATIONAL SYMPOSIUM OF JWRI 30TH ANNIVERSARY)

概要

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To endow polyethylene terephthalate (PET) plastic material with photocatalytic properties, anatase TiO_2 powders were plasma sprayed under various plasma spraying conditions. The effects of spraying parameters on the microstructure and photocatalytic activity of TiO_2 coating were systematically studied. The photocatalytic activity of the TiO_2 coating was evaluated by the decomposition test of acetaldehyde gas. From the experimental result, it was found that fabrication of TiO_2 coating was possible on PET substrate at arc currents of 200, 300 and 400A. The TiO_2 coatings became thicker with increasing arc current. However, the coating was not formed when the plasma spraying was carried out on steel substrates even at a high arc current of 400A. It was found from the acetaldehyde decomposition test that all fabricated TiO_2 coatings exhibited photocatalytic activity regardless of spraying parameters. Even coatings with thin layers also showed the same photocatalytic performance as thick coatings. From the XRD analysis, the reason for the efficient photocatalytic activity in the coatings was due to the high anatase phase content.
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