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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
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
OSTI Identifier:
868909
Patent Number(s):
US 5242508
Application Number:
07/869,897
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA)
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. 1993. "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 = {},
url = {https://www.osti.gov/biblio/868909}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}

Works referenced in this record:

New material for permanent magnets on a base of Nd and Fe (invited)
journal, March 1984


Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds
journal, September 1984


Hot‐pressed neodymium‐iron‐boron magnets
journal, April 1985


Processing of Neodymium-Iron-Boron melt-spun ribbons to fully dense magnets
journal, September 1985


Iron‐based rare‐earth magnets (invited)
journal, April 1985


Low oxygen processing of SmCo5 magnets
journal, March 1981