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Synchronization of Suspension Plasma Spray Injection with the Arc Fluctuations

Joanna Krowka 1 Vincent Rat 1 Simon Goutier 1 Jean-François Coudert 1 
1 SPCTS-AXE2 - Axe 2 : procédés plasmas et lasers
SPCTS - Science des Procédés Céramiques et de Traitements de Surface
Abstract : Poorly controlled heat and momentum transfers between plasma and material, plasma instabilities are some of the difficulties encountered in suspension plasma spraying. The improvement of this method is usually attempted by means of the reduction of arc fluctuations. This paper presents a new approach to the injection of reactive material in an arc jet. The principle is to produce a pulsed laminar plasma jet combined with phased injection of liquid droplets. This is achieved by the particular design of the plasma torch that works at moderate power and following a resonant mode. The droplets are injected using a piezoelectric device, based on drop-on-demand method, triggered by the voltage signal sampled at the torch connections. The results are evaluated by time-resolved imaging technique that shows how the trajectories are influenced by the moment at which the droplets penetrate the plasma jet.
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Soumis le : jeudi 16 mars 2017 - 16:15:21
Dernière modification le : samedi 26 mars 2022 - 04:30:45

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Joanna Krowka, Vincent Rat, Simon Goutier, Jean-François Coudert. Synchronization of Suspension Plasma Spray Injection with the Arc Fluctuations. Journal of Thermal Spray Technology, ASM International/Springer, 2014, 23 (5), pp.786 - 794. ⟨10.1007/s11666-014-0081-6⟩. ⟨hal-01491325⟩



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