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Method of making permanent magnets

Patent ·
OSTI ID:868909
 [1];  [1];  [1];  [1]
  1. Ames, IA
+ Show Author Affiliations

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 University, Ames, IA (US)
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
Low oxygen processing of SmCo5 magnets journal March 1981
Hot‐pressed neodymium‐iron‐boron magnets journal April 1985
Processing of Neodymium-Iron-Boron melt-spun ribbons to fully dense magnets journal September 1985
Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds journal September 1984
Iron‐based rare‐earth magnets (invited) journal April 1985

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Related Subjects

/148/75/
40
alloy
alloy particle
alloy particles
as-atomized
atomizing
classified
coated
compact
comprises
concurrent
conditions
densified
diameter
earth-transition
earth-transition metal
effective
elevated
elevated temperature
enhanced
enhanced magnetic
enriched
exhibiting
fraction
isotropic
isotropic permanent
magnet
magnet comprises
magnetic
magnetic properties
magnetically
magnets
majority
mechanical
mechanical properties
melt
metal
metal alloy
method
microns
nd--fe--b
optimum
particles
permanent
permanent magnet
permanent magnets
pressure
produce
produced
properties
protectively
rapidly
rapidly solidified
rare
rare earth
rare earth-transition
size
size fraction
solidified
spherical
spherical alloy
subjecting
temperature
time
time effective
transition metal
yield