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Title: Method of making permanent magnets

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.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. (Ames, IA)
Publication Date:
OSTI Identifier:
868909
Report Number(s):
US 5242508
US patent application 07/869,897
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Patent
Research Org:
Ames Laboratory (AMES), Ames, IA; Iowa State University, Ames, IA (US)
Country of Publication:
United States
Language:
English
Subject:
method; permanent; magnets; method; isotropic; permanent; magnet; comprises; atomizing; melt; rare; earth-transition; metal; alloy; nd--fe--b; alloy; enriched; conditions; produce; protectively; coated; rapidly; solidified; spherical; alloy; particles; majority; particles; produced; size; classified; size; fraction; 40; microns; diameter; exhibiting; optimum; as-atomized; magnetic; properties; subjecting; particles; concurrent; elevated; temperature; elevated; isotropic; pressure; time; effective; yield; densified; magnetically; isotropic; magnet; compact; enhanced; magnetic; properties; mechanical; properties; size fraction; isotropic permanent; permanent magnet; permanent magnet; elevated temperature; transition metal; rare earth; permanent magnets; metal alloy; mechanical properties; time effective; alloy particles; earth-transition metal; rare earth-transition; magnetic properties; magnetic properties; spherical alloy; rapidly solidified; enhanced magnetic; alloy particle; magnet comprises /148/75/