Abstract
Atomizing parameters for cerntrifugal atomization of metal powder is theoretically investigated. Predictional formulas of average diameter by the disintegration mechanism of direct-drop-formation and stopping distance of atomized particle are derived as d=3.25 (ω2R)-1/2 (σ/ρ)1/2 and L5=1.29ρ1/4σ3/4ω-1R-1/4S-1ρg-1/2μg-1/2, respectively, where ω: revolution rate, R: radius of rotating disk, σ1: surface tension, ρ: density, μ: viscosity, and subscript g means the character of atmospheric gas. Cetnrifugal atomization diagram which shows the predominating mechanism of disintegration in a given atomizing condition is proposed. According to the diagram, metallic liquids are mainly located in the area of unstable column-formation-disintegration. It is predicted that the production of fine and uniform-sized metallic powder requests much more powerful rotating conditions than usual.
