In-flight particle diagnostics in induction plasma processing |
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| Authors: | S Coulombe M I Boulos |
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| Institution: | (1) Plasma Technology Research Centre (CRTP), Department of Chemical Engineering, Université de Sherbrooke, J1K 2R1 Sherbrooke, Québec, Canada;(2) Present address: Plasma Technology Research Centre (CRTP), Department of Chemical Engineering, McGill University, H3A 2A7 Montréal, Québec, Canada |
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| Abstract: | A laser Doppler anemometer combined with a particle-emission spectrometer, are used for the study of the induction plasma spraying process. For this, the effects of chamber pressure, spray distance and torch nozzle design on the particle surface temperature and velocity as well as the fraction of hot particles included in the stream of processed material, were investigated. A comparison between the velocity measurements by laser Doppler anemometry (LDA) and by the particle time-of-flight technique is presented in order to emphasize the deference between the velocity of the hot particles, and that of the total particle population, cold and hot. The influence of the individual particle mass on particle entrainment in the plasma jet from the ambient atmosphere in the vacuum chamber is discussed. |
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| Keywords: | Plasma spraying induction plasma particle diagnostics particle surface temperature and velocity two-color pyrometry particle time-of-flight technique laser Doppler anemometry |
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