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Title: Method of making permanent magnets

Patent ·
OSTI ID:868909
 [1];  [1];  [1];  [1]
  1. Ames, IA
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A method for making an isotropic permanent magnet comprises atomizing a melt of a rare earth-transition metal alloy (e.g., an Nd--Fe--B alloy enriched in Nd and B) under conditions to produce protectively coated, rapidly solidified, generally spherical alloy particles wherein a majority of the particles are produced/size classified within a given size fraction (e.g., 5 to 40 microns diameter) exhibiting optimum as-atomized magnetic properties and subjecting the particles to concurrent elevated temperature and elevated isotropic pressure for a time effective to yield a densified, magnetically isotropic magnet compact having enhanced magnetic properties and mechanical properties.

Research Organization:
Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
DOE Contract Number:
W-7405-ENG-82
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Number(s):
US 5242508
Application Number:
07/869,897
OSTI ID:
868909
Country of Publication:
United States
Language:
English

References (6)

New material for permanent magnets on a base of Nd and Fe (invited) journal March 1984
Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds journal September 1984
Hot‐pressed neodymium‐iron‐boron magnets journal April 1985
Processing of Neodymium-Iron-Boron melt-spun ribbons to fully dense magnets journal September 1985
Iron‐based rare‐earth magnets (invited) journal April 1985
Low oxygen processing of SmCo5 magnets journal March 1981

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