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Journal of KWJS 2003;21(4):46-55.
Published online August 25, 2003.
Photocatalytic Property of Nano-Structured TiO2 Thermal Sprayed Coating - PartⅡ: TiO2 -WO3 Coating -
Changhoon Lee, Hanshin Choi, Changhee Lee, Hyungjun Kim, Dongwoo Shin
Abstract
TiO2-WO3(8.2wt%) coatings were prepared by the APS (Atmospheric Plasma Spraying) process to clarify the relationship between the process parameters(H2 gas flow rate of plasma 2nd gas and spraying distance) of the APS coating and photo-decomposition efficiency kinetics of the MB(methylene blue) aqueous solution decomposition and to understand the effect of addition of WO3 on photocatalytic properties of TiO2 sprayed coating. Further, the temperature and velocity of flying particles were measured by DPV-2000 to investigate the relationship between microstructure of coatings and process parameters. Properties of coatins were investigated by XRD, SEM, XPS, RAMAN, UV/VIS spectrometer. In case of the TiO2-WO3(8.2wt%) coating, it had a lower anatase fraction than that of pure-TiO2 coatings because of flying in the higher temperature plasma plume by the heavy weight of TiO2, WO3. And, when WO3 added powders were sprayed, the doping effects of W ions substituted into the Ti ion sites was not occured during melting and solidification cycles of spraying. It was found that the addition of WO3 was ineffective effective on increasing photo- decomposition efficiency of TiO2 sprayed coating.


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