Abstract
The behavior of individual plasma- sprayed particles as they impinge on a surface was monitored using two high- speed two- color pyrometers, one focused 2 mm before the substrate and the other focused on the substrate surface. The influence of the velocity of the impinging particles (determined from the time of flight between the two focused points of the pyrometers) on the deformation and cooling processes was investigated. Results on zirconia particles impacting on a smooth bare steel substrate are presented in terms of apparent flattening time, splat diameter, and cooling rate determined from the pyrometer signals.
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