| 摘要 |
PURPOSE:To obtain uniform and fine metallic flakes solidified by rapid cooling at a short scattering distance by atomizing molten metal flowing out of a nozzle and by solidifying the resulting droplets by rapid cooling. CONSTITUTION:Molten metal 2 in a crucible 1 is spouted from a nozzle 3 attached to the bottom of the crucible 1. At the same time gas as an atomizing medium is blown into an ultrasonic and supersonic gas atomizing device 4 placed around the nozzle 2 from a pipe 5 at supersonic speed, and it is jetted into the molten metal 2 flowing out of the nozzle 3 to atomize the molten metal 2. A jet flow of the resulting droplets 6 is hit on the surface of a water-cooled rotating roll 7 before the droplets 6 are thoroughly solidified. Thus, flakes 7 solidified by rapid cooling are obtd. Ar, N2, He or air is used as said atomizing medium.
|
