| 摘要 |
PURPOSE:To obtain ultrafine metallic powder having uniform particle size at low cost by blowing a gas against a metallic material, an arc column and an anodic flame, and providing a cooling rod in the anodic flame to control the average particle size and the particle size distribution of the ultrafine metallic powder. CONSTITUTION:An arc column 10 is generated by arc discharge between a metallic material 11 on a water-cooled copper hearth 4 and a cathodic electrode 3. The metallic material 11 is melted by the arc column 10, and an anodic flame 12 for forming ultrafine metallic powder is generated and sent to a filter 6 by a circulation gas. At this time, the circulating gas is blown against the metallic material 11, the arc column 10 and the anodic flame 12 from nozzles 13 through an introducing tube part 13a to concentrate the arc column 10 upon the surface of the metallic material 11. A cooling rod 14 is inserted into the anodic flame 12 to attract the anodic flame to the circumference of the cooling rod 14. Thus the anodic flame 12 is throttled and sent upward in the vessel. By this method, the ultrafine metallic powder having optimum average particle size and particle size distribution is obtained. |
