Shigeyasu Amada1 and Masahiro Haruyama2 and Takashi Ohyagi1
1Department of Mechanical Engineering, School of Engineering, Gunma University, Kiryu, 376-8515
Plasma sprayed coatings are formed by a continuous deposition of numerous and molten droplets, which lead to a lamella structure. So that, it is very crucial to understand the interaction between molten droplets and substrates. This report presents the influence of wettability of substrates by molten metal droplets with on flattening degree of splats. Using a free-fall droplets apparatus, the metal Sn, Pb, Cu, and Fe are used for the experiments. Taking an equilibrium contact angle of metals into the enegy balance for impingement of molten droplets, the relationship between the theoretical and experimental results shows approximately a good agreement in some Re and We regions.
(Received July 23, 1998; In Final Form October 2, 1998)
molten droplet, flattening ratio, wettability, substrate, contact angle
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