R. Etchart-Salas, V. Rat, J. F. Coudert, SPCTS-University of Limoges, Limoges, France; P. FAUCHAIS, SPCTS Laboratory, University of Limoges, Limoges, France
Suspension Plasma Spraying (SPS) allows depositing finely structured coatings. This paper presents an analysis of spraying parameters which leads to control the interaction plasma jet-suspension. A particular attention is paid to the treatment of materials (suspension jet or drops) according to different working parameters such as the plasma mixture and the injection pressure. Concerning the suspension injection, by observing the suspension drops injection with a fast shutter camera triggered by a defined voltage level of the plasma torch, it is shown that plasma fluctuations have a strong influence on drops fragmentation. The deviation and dispersion trajectories of droplets are observed within the plasma jet.
Summary: The suspension injection in Suspension Plasma Spraying is studied. The influence of voltage fluctuations on the fragmentation of the suspension is highlighted by using a fast shutter camera triggered by a defined voltage level of the plasma torch.
