Abstract
Plasma spraying is one of the most versatile techniques used to form coatings for protection against oxidation, corrosion, and wear. The plasma spraying is ideally suited for refractory materials, but there are a number of variables that need to be controlled to obtain dense coatings. In spite of considerable progress made in the theoretical understanding of this complex process, there is a need for a simple method to evaluate the interaction between the plasma flame and powder particles that form the coatings. As reported in the literature, this involves metallographic observation of the powders collected from the plasma. In the present study, the structure and morphology of plasma-sprayed splats are experimentally investigated using different power levels and spray distances for alumina powder. The results show that the splashing occurs during splatting of a completely molten droplet. It is found that at higher power levels and shorter spray distances, spreading of molten droplets improves considerably.
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Selvarajan, V., Saravanan, P. & Srivastava, M.P. Experimental study of particle deposition characteristics of alumina using plasma spraying. J Therm Spray Tech 10, 138–141 (2001). https://doi.org/10.1361/105996301770349619
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DOI: https://doi.org/10.1361/105996301770349619