Comparison between metallic and ceramic splats: Influence of viscosity and kinetic energy on the particle flattening

It has been shown that for droplets (40 μm in diameter) the thickness of the liquid flow boundary layer between flattening droplets and substrate plays a more important role than with drops. It must also be pointed out that with the metal drops or droplets, solidification at their surface can occur, thus modifying the matter flattening. The flattening process depends strongly upon the substrate temperature and the modification of its wettability. Finally, it has been shown that the flattening velocity is strongly linked to the amounts of adsorbates and condensates existing on the substrate, according to heat treatments prior to spraying.