DEPOSITION OF FINE PARTICLES ON SURFACE O F CORE PARTICLES BY HIGH-SPEED ELLIPTIC-ROTOR-TYPE MIXER

A particle composite process by using a high-speed elliptical-rotor-ty pe mixer is analyzed. Deposition of fine particles onto the surface of core particle was selected. Rotor revolution and processing time were used as processing parameters, and the diameter of core particle was selected as powder property. The effect of these parameters on the com posite process is investigated. As a result, the composite process in the mixer is classified as one of two patterns: below a critical rotor revolution, the mass fraction of fine particles deposited onto the su rface of the core particle increased as the rotor revolution and the p rocessing time increased, and then the mass fraction reached a constan t value with processing time. On the other hand, in the range over the critical revolution, the mass fraction of fine particles increased at the initial processing time, and then the detachment of fine particle s from the core particles occurred after a certain processing time. Th e critical rotor revolution was in proportin to the -0.5 th power of t he core particle diameter. From these results, a model of the particle composite process in this mixer is proposed, and the composite proces s is explained.