Effect of wettability on the flattening process of molten droplets

Plasma sprayed coatings are formed by a continuous deposition of numerous a nd molten droplets, which lead to a lamella structure. So that, ii is very crucial to understand the interaction between molten droplets and substrate s. This report presents the influence of wettability oi substrates by molte n metal droplets with on flattening degree of splats. Using a free-fall dro plets apparatus, the metals Sn, Pb, Cu and Fe are used for the experiments. Taking an equilibrium contact angle of metals into the energy balance for impingement of molten droplets, the relationship between the theoretical an d experimental results shows approximately a good agreement in some Re and We regions.