In-Flight Temperature and Velocity of Powder Particles of Plasma-Sprayed TiO2

Abstract

This paper relates to the in-flight temperature and velocity of TiO2 particles, an integral part of the systematic research on atmospheric plasma spraying of the material. Initial powder feedstock (32-45 μm, 100% rutile phase) was introduced into the plasma jet. Six parameters were selected to represent the versatility of the plasma system and their respective influences were determined according to basic one-at-a-time and advanced Taguchi design of experiments combined with the analysis of variance analytical tool. It was found that the measured temperatures varied from 2121 to 2830 K (33% variation), while the velocities of the particles were altered from 127 to 243 m/s (91% variation). Gun net power was detected as the most influential factor with respect to the velocity of the TiO2 particles (an increase of 8.4 m/s per 1-kW increase in net power). Spray distance was determined to have a major impact on the in-flight temperature (a decrease of 10 mm in spray distance corresponds to a drop of 36 K). A significant decrease in both characteristics was detected for an increasing amount of powder entering the plasma jet: A drop of 7.1 K and 1.4 m/s was recorded per every +1 g/min of TiO2 powder.

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Acknowledgments

The Project has been funded from the SoMoPro programme. Research leading to these results has received a financial contribution from the European Community within the Seventh Framework Programme (FP/2007-2013) under Grant Agreement No. 229603. The research is also co-financed by the South Moravian Region. The EC OP Project No. CZ.1.07./2.3.00/20.0197 is gratefully acknowledged.

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Correspondence to Jan Cizek.

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This article is an invited paper selected from presentations at the 5th Asian Thermal Spray Conference (ATSC 2012) and has been expanded from the original presentation. ATSC 2012 was held at the Tsukuba International Congress Center, Ibaraki, Japan, November 26-28, 2012, and was organized by the Japan Thermal Spray Society and the Asian Thermal Spray Society.

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Cizek, J., Khor, K.A. & Dlouhy, I. In-Flight Temperature and Velocity of Powder Particles of Plasma-Sprayed TiO2 . J Therm Spray Tech 22, 1320–1327 (2013). https://doi.org/10.1007/s11666-013-9993-9

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Keywords

  • in-flight properties
  • plasma spray
  • rutile
  • Taguchi design
  • TiO2
  • titania