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Cold Spraying of TiO2 Photocatalyst Coating With Nitrogen Process Gas

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Abstract

Titanium dioxide (TiO2) is a promising material for photocatalyst coatings. However, it is difficult to fabricate a TiO2 coating with anatase phase by conventional thermal spray processes due to a thermal transformation to rutile phase. In this paper, anatase TiO2 coatings were fabricated by the cold spray process. To understand the influence of process gas conditions on the fabrication of the coatings, the gas nature (helium or nitrogen) and the gas temperature are investigated. It was possible to fabricate TiO2 coatings with an anatase phase in all spraying conditions. The process gas used is not an important factor to fabricate TiO2 coatings. The thickness of the coatings increased with the process gas temperature increasing. It indicates that the deposition efficiency of the sprayed particles can be enhanced by controlling the spray conditions. The photocatalytic activity of the coatings is similar or better than the feedstock powder due to the formation of a large reaction area. Concludingly, cold spraying is an ideal process for the fabrication of a TiO2 photocatalyst coating.

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Acknowledgments

This study was supported by the Steel Industry Foundation for the Advancement of Environmental Protection Technology. The authors would like to thank TAYCA for the synthesis and supply of the TiO2 powder.

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Authors and Affiliations

  1. Toyohashi University of Technology, Toyohashi, Aichi, Japan

    Motohiro Yamada, Hiroaki Isago, Hiromi Nakano & Masahiro Fukumoto

Authors
  1. Motohiro Yamada
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  2. Hiroaki Isago
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  3. Hiromi Nakano
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  4. Masahiro Fukumoto
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Corresponding author

Correspondence to Motohiro Yamada.

Additional information

This article is an invited paper selected from presentations at the 4th Asian Thermal Spray Conference (ATSC 2009) and has been expanded from the original presentation. ATSC 2009 was held at Nanyang Hotel, Xi’an Jiaotong University, Xi’an, China, October 22-24, 2009, and was chaired by Chang-Jiu Li.

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Yamada, M., Isago, H., Nakano, H. et al. Cold Spraying of TiO2 Photocatalyst Coating With Nitrogen Process Gas. J Therm Spray Tech 19, 1218–1223 (2010). https://doi.org/10.1007/s11666-010-9520-1

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  • DOI: https://doi.org/10.1007/s11666-010-9520-1

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