Method of preparing particles with a controlled narrow distribut

Details Method of preparing particles with a controlled narrow distribut Method of preparing particles with a controlled narrow distribut

1991-09-05

1994-04-12

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing solid particulate free metal directly from liquid...

75352, 75355, B05B 302

Patent

active

053021827

ABSTRACT:
The method for preparing metal powders with a narrow particle size distribution includes providing a disintegrator with a working chamber containing counter-rotating disks equipped with teeth designed to impart high tangential velocities to particles contacting the teeth, introducing a metal melt as a liquid stream with a composition substantially corresponding to the final metal powder composition into the working chamber of the disintegrator, counter-rotating the disks, whereby the liquid stream of metal entering the chamber is broken up into small beads, which leave the surface of the teeth with high velocities, and whereby subsequent contact of the beads with the teeth of the disks further break up the liquid beads until the bead solidifies by heat loss to the disks and collecting a fine metal powder of narrow particle size distribution at the exit end of the working chamber.

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A. Lawley, "Powder Metallurgy Processing: A Perspective for North America", Power Metallurgy, Global Review, 33(3):217 (1990).
Nicholas J. Grant, "Rapid Solidification of Metallic Particulates", Journal of Metals, pp. 20-27 (Jan. 1988).

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