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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. 13 figures.

Inventors:
; ; ;
Issue Date:
OSTI Identifier:
5440720
Patent Number(s):
5242508 A
Application Number:
PPN: US 7-869897
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Patent File Date: 15 Apr 1992
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; BORON ALLOYS; FABRICATION; MAGNETIC PROPERTIES; IRON ALLOYS; NEODYMIUM ALLOYS; PERMANENT MAGNETS; ATOMIZATION; PARTICLE SIZE; SOLIDIFICATION; ALLOYS; MAGNETS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH ALLOYS; SIZE; 360101* - Metals & Alloys- Preparation & Fabrication; 360104 - Metals & Alloys- Physical Properties; 420200 - Engineering- Facilities, Equipment, & Techniques

Citation Formats

McCallum, R W, Dennis, K W, Lograsso, B K, and Anderson, I E. Method of making permanent magnets. United States: N. p., 1993. Web.
McCallum, R W, Dennis, K W, Lograsso, B K, & Anderson, I E. Method of making permanent magnets. United States.
McCallum, R W, Dennis, K W, Lograsso, B K, and Anderson, I E. Tue . "Method of making permanent magnets". United States.
@article{osti_5440720,
title = {Method of making permanent magnets},
author = {McCallum, R W and Dennis, K W and Lograsso, B K and Anderson, I 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. 13 figures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {9}
}