Transient Phenomena in Plasma Torches and in Plasma Sprayed Coating Generation

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Abstract
D.C. plasma torches are more and more widely used for different applications among which cutting, welding and spraying are probably the most developed. For a long period it is mainly their static characteristics which have been considered and their applications were studied on a macroscopic scale. However many transient phenomena occur, the systematic study of which has started only a few years ago. To limit the discussion we present only the case of plasma spraying with : • the transient phenomena, at the anode, and their evolution with the torch working parameters and the electrodes erosion, • the consequences of these fluctuations on plasma jet temperature and velocity fields as well as mean electric field in the arc column, • the characterization of the molten particles flattening and resulting splat cooling and consequences on coating properties

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