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Title: Method of making bonded or sintered permanent magnets

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.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
6053090
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) IMS; EDB-93-120682
Patent Number(s):
US 5240513; A
Application Number:
PPN: US 7-593943
Contract Number:
W-7405-ENG-82
Resource Relation:
Patent File Date: 9 Oct 1990
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; PERMANENT MAGNETS; FABRICATION; BINDERS; BONDING; CASTING MOLDS; GRAPHITE; IRON ALLOYS; MIXING; PARTICLE SIZE; POWDERS; RARE EARTH ALLOYS; SINTERING; TRANSITION ELEMENTS; ALLOYS; CARBON; ELEMENTAL MINERALS; ELEMENTS; JOINING; MAGNETS; METALS; MINERALS; NONMETALS; SIZE; 360101* - Metals & Alloys- Preparation & Fabrication