Method of making bonded or sintered permanent magnets
Abstract
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. 14 figs.
- Inventors:
- Issue Date:
- Research Org.:
- Iowa State Univ., Ames, IA (United States)
- OSTI Identifier:
- 131933
- Patent Number(s):
- 5470401
- Application Number:
- PAN: 8-097,442
- Assignee:
- Iowa State Univ. Research Foundation, Inc., Ames, IA (United States)
- DOE Contract Number:
- W-7405-ENG-82
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 28 Nov 1995
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 36 MATERIALS SCIENCE; PERMANENT MAGNETS; FABRICATION; RARE EARTH ALLOYS; TRANSITION ELEMENT ALLOYS; BINDERS; MOLDING
Citation Formats
McCallum, R W, Dennis, K W, Lograsso, B K, and Anderson, I E. Method of making bonded or sintered permanent magnets. United States: N. p., 1995.
Web.
McCallum, R W, Dennis, K W, Lograsso, B K, & Anderson, I E. Method of making bonded or sintered permanent magnets. United States.
McCallum, R W, Dennis, K W, Lograsso, B K, and Anderson, I E. Tue .
"Method of making bonded or sintered permanent magnets". United States.
@article{osti_131933,
title = {Method of making bonded or sintered permanent magnets},
author = {McCallum, R W and Dennis, K W and Lograsso, B K and Anderson, I E},
abstractNote = {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. 14 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 28 00:00:00 EST 1995},
month = {Tue Nov 28 00:00:00 EST 1995}
}