| 摘要 |
Atomizing techniques produce fine and uniform ceramic powders and metal powders, by melting the particulate metal or ceramic to be atomized at high temperatures in a plasma melting torch, impacting the stream of high temperature gas and drops of molten feed material against a suitable moving impact substrate to produce fine droplets, and chilling these droplets in a quench gas to produce rapid solidification, optimizing internal crystal structure. The substrate is formed as a disk or belt moved continuously to produce constantly changing impact zones, and a liquid rinsing and squeegee wiping operation or a vacuum cleaning operation is employed to clear the substrate of any accumulated residue of the impacted material. The rapidly solidified particles are recovered by filtration or separating steps from the quench gas and the rinsing liquid. A preferred impact substrate material is a thin layer or Teflon FEP laminated to a slightly thicker layer of aluminum foil.
|
