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Title: Method of making permanent magnets

Abstract

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.

Inventors:
 [1];  [1];  [1];  [1]
  1. Ames, IA
Issue Date:
Research Org.:
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
OSTI Identifier:
868909
Patent Number(s):
5242508
Application Number:
07/869,897
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; permanent; magnets; isotropic; magnet; comprises; atomizing; melt; rare; earth-transition; metal; alloy; nd-fe-b; enriched; conditions; produce; protectively; coated; rapidly; solidified; spherical; particles; majority; produced; size; classified; fraction; 40; microns; diameter; exhibiting; optimum; as-atomized; magnetic; properties; subjecting; concurrent; elevated; temperature; pressure; time; effective; yield; densified; magnetically; compact; enhanced; mechanical; size fraction; isotropic permanent; 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; spherical alloy; rapidly solidified; enhanced magnetic; alloy particle; magnet comprises; /148/75/

Citation Formats

McCallum, R William, Dennis, Kevin W, Lograsso, Barbara K, and Anderson, Iver E. Method of making permanent magnets. United States: N. p., 1993. Web.
McCallum, R William, Dennis, Kevin W, Lograsso, Barbara K, & Anderson, Iver E. Method of making permanent magnets. United States.
McCallum, R William, Dennis, Kevin W, Lograsso, Barbara K, and Anderson, Iver E. Tue . "Method of making permanent magnets". United States. https://www.osti.gov/servlets/purl/868909.
@article{osti_868909,
title = {Method of making permanent magnets},
author = {McCallum, R William and Dennis, Kevin W and Lograsso, Barbara K and Anderson, Iver E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {9}
}

Patent:

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