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Method of making bonded or sintered permanent magnets

Patent ·
OSTI ID:870179
 [1];  [1];  [1];  [1]
  1. Ames, IA
+ Show Author Affiliations

An isotropic permanent magnet is made by mixing a thermally responsive, low viscosity binder and atomized rare earth-transition metal (e.g., iron) alloy powder having a carbon-bearing (e.g., graphite) layer thereon that facilitates wetting and bonding of the powder particles by the binder. Prior to mixing with the binder, the atomized alloy powder may be sized or classified to provide a particular particle size fraction having a grain size within a given relatively narrow range. A selected particle size fraction is mixed with the binder and the mixture is molded to a desired complex magnet shape. A molded isotropic permanent magnet is thereby formed. A sintered isotropic permanent magnet can be formed by removing the binder from the molded mixture and thereafter sintering to full density.

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 5470401
Application Number:
08/097,442
OSTI ID:
870179
Country of Publication:
United States
Language:
English

References (8)

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
Nd–Fe–B Permanent Magnet Materials journal June 1987
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
The metal injection molding process comes of age journal August 1989
Iron‐based rare‐earth magnets (invited) journal April 1985

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Related Subjects

/148/75/252/
alloy
alloy powder
atomized
atomized rare
binder
bonded
bonding
carbon-bearing
classified
complex
density
desired
earth-transition
earth-transition metal
facilitates
formed
fraction
grain
grain size
graphite
iron
isotropic
isotropic permanent
layer
layer thereon
magnet
magnets
metal
method
mixed
mixing
mixture
molded
molded mixture
narrow
narrow range
net shape
particle
particle size
particles
particular
particular particle
permanent
permanent magnet
permanent magnets
powder
powder particles
prior
provide
range
rare
rare earth
rare earth-transition
relatively
relatively narrow
removing
responsive
selected
selected particle
shape
sintered
sintered permanent
sintering
size
size fraction
sized
thereafter
thereon
thermally
thermally responsive
transition metal
viscosity
viscosity binder
wetting