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Rare earth permanent magnet and method for making same

  • US 6,302,939 B1
  • Filed: 02/01/1999
  • Issued: 10/16/2001
  • Est. Priority Date: 02/01/1999
  • Status: Expired due to Term
First Claim
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1. Method for producing a mixture of particles of different morphologies comprising one or more rare earth elements, iron and boron, said method comprising the steps of:

  • providing a molten alloy comprising rare earth, iron and boron;

    introducing said molten alloy onto a rotating disk to produce droplets of said alloy;

    cooling said droplets by subjecting said droplets to a gaseous cooling medium such that a first portion of said droplets solidifies into substantially spherical or irregular particles and a second portion of said droplets remains molten;

    impacting said second portion of said droplets and said substantially spherical or irregular particles, after being cooled by said gaseous cooling medium, onto a splat shield such that said second portion of said droplets impact said splat shield to form substantially plate-like particles.

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