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Phase formation of nano-TiO2 particles during flame spraying with liquid feedstock

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Abstract

The nanostructured TiO2 photocatalytic coatings were synthesized through flame spraying with liquid feedstock under different conditions. The nanostructured TiO2 deposit of substantial anatase phase was annealed at different temperatures. X-ray diffraction analysis showed that significant transformation from anatase to rutile occurred at a temperature above 600 °C. However, thermal analysis suggested that the phase transformation from anatase to rutile started at a temperature from 400 to 500°C. It was found that the grain size of rutile phase was larger than that of anatase. The deposits annealed at temperatures lower than 450°C were photocatalytically active. However, the deposit annealed at 500°C, which contained 95% anatase crystalline, became photocatalytically inactive. Based on the experimental findings, a model is proposed to explain the phase transformation of the nano-TiO2 particles and the phase formation in flame-spraying of nanostructured TiO2 deposit with liquid feedstock.

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, 710049, Xi’an, Shaanxi, People’s Republic of China

    Guan-Jun Yang, Chang-Jiu Li & Yu-Yue Wang

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  1. Guan-Jun Yang
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  2. Chang-Jiu Li
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  3. Yu-Yue Wang
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Additional information

The original version of this paper was published as part of the DVS Proceedings: “Thermal Spray Solutions: Advances in Technology and Application,” International Thermal Spray Conference, Osaka, Japan, 10–12 May 2004, CD-Rom, DVS-Verlag GmbH, Düsseldorf, Germany.

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Yang, GJ., Li, CJ. & Wang, YY. Phase formation of nano-TiO2 particles during flame spraying with liquid feedstock. J Therm Spray Tech 14, 480–486 (2005). https://doi.org/10.1361/105996305X76487

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  • DOI: https://doi.org/10.1361/105996305X76487

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