プラズマ回転電極法の実用化研究 -液滴の放出と二次粒子の発生- Study on the Operation Practice of Plasma Rotating Electrode Process(PREP)-Ejection of the Droplet and Formation of the Secondary Particle-
The study on the ejection process of the droplets from the edge of the molten surface during plasma rotating electrode process (PREP) of the titanium electrode was carried out under the condition in which an appropriate deviation between the plasma center and the rotating electrode center was applied.The experimental results suggest that the retaining force which principally consists of surface tension of the liquid phase and act to the each droplets, is affected by the local shape of the molten surface of the electrode where ejection of the droplet occures. At the lower plasma voltage, relatively sharp edge of the electrode was formed, and then the produced particle diameter was smaller than that obtained under the ordinary operation voltage. Such a result may be caused by formation of protuberances overlaped on the edge of the electrode. Further PREP experiments were carried out using the special electrodes whose surfaces were surrounded by the lines of protuberances. The results informed that existance of such protuberances introduce a posibility of obtaining the smaller particles and the decreased secondary particles.
粉体および粉末冶金 43(7), 907-912, 1996-07-15
Japan Society of Powder and Powder Metallurgy