Abstract
Plasma sprayed ceramic coatings are mainly used for the protection of metal components in diesel engines, gas turbines and aeroengines. Increasing demands for better thermomechanical properties at higher temperatures require well defined and reproducible spraying conditions. The way the powder is manufactured plays an important role in the quality of the coatings. This paper presents a study carried out on three grades of zirconia powders manufactured by different processes. The heat treatment of the powders has been monitored within the plasma jet by in flight pyrometry and laser velocimetry. The particulates melting is controlled by observation of individual particulates splats collected on glass slides. A mathematical model of plasma particulates heat transfer allows to explain the obtained results.
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