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Journal of KWJS 2003;21(4):39-45.
Published online August 25, 2003.
[연구논문]나노구조 TiO2 용사코팅의 미세조직 제어 공정기술 개발과 광촉매 특성평가 - Part Ⅰ: TiO2 코팅 -
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Photocatalytic Property of Nano-Structured TiO2 Thermal Sprayed Coating - Part Ⅰ: TiO2 Coating -
Changhoon Lee, Hanshin Choi, Changhee Lee, Hyungjun Kim, Dongwoo Shin
Abstract
Nano-TiO2 photocatalytic coatings were deposited on the stainless steel 304(50x70x3mm) by the APS(Atmospheric Plasma Spraying). Photocatlytic reaction was tested in MB(methylene blue) aqueous solution. For applying nano-TiO2 powders by thermal spray, the starting nano-TiO2 powder with 100% anatase crystalline was agglomerated by spray drying. Plasma second gas(H2) flow rate and spraying distance were used as principal process parameters which are known to control heat enthalpy(heat input). The relationship between process parameters and the characteristics of microstructure such as the anatase phase fraction and grain size of the TiO2 coatings were investigated. The photo-decomposition efficiency of TiO2 coatings was evaluated by the kinetics of MB aqueous solution decomposition. It was found that the TiO2 coating with a lower heat input condition had a higher anatase fraction, smaller anatase grain size and a better photo-decomposition efficiency.


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