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
- 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}
}
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