Effect of Surface Wettability and Temperature on Ceramic Droplet Flattening

The wettability of the sprayed material on the solid surface plays a significant role in the flattening of the droplet under plasma spray conditions. However if various studies have been reported on metal droplets falling on metal substrates, very few deal with the wetting of metal or ceramic surface with ceramic droplets.

This works is about the investigation of ceramic droplets falling on metal and ceramic substrates. It combines the observation of millimetre–size droplets under free fall conditions and micrometer –size droplets under plasma spray conditions. Both experiments are conducted on single droplets. The first makes it possible to estimate the wetting of the surface by the liquid ceramic while the second experiment allows the study of droplet flattening in relation to its impact parameters.