DocumentCode :
1450916
Title :
On the Squareness Factor Behavior of RE-FeB (RE 
Nd or Pr) Magnets Above Room Temperature
Author :
Périgo, E.A. ; Takiishi, H. ; Motta, C.C. ; Faria, R.N.
Author_Institution :
Nucl. & Energy Res. Inst., Sao Paulo, Brazil
Volume :
45
Issue :
10
fYear :
2009
Firstpage :
4431
Lastpage :
4434
Abstract :
The magnetic stability of RE-FeB (RE = Nd or Pr) sintered magnets above room temperature was investigated by monitoring the squareness factor (SF). At 293 les T les 423 K, commercial anisotropic NdFeB-based sintered magnets with a Curie temperature (T c) of around 585 K showed no appreciable change in their squareness factors. This indicates that the SF is controlled mainly by the samples´ microstructural features. Magnets with T c > 593 K showed a tendency for improved squareness factor at higher temperatures due to the methodology employed to characterize the SF. On the other hand, PrFeCoBCuNb sintered magnets with T c > 593 K presented a reduction in the SF with temperature rising from 298 to 373 K.
Keywords :
Curie temperature; boron alloys; cobalt alloys; copper alloys; iron alloys; magnetic anisotropy; magnetic hysteresis; neodymium alloys; niobium alloys; permanent magnets; praseodymium alloys; sintering; Curie temperature; NdFeB; PrFeB; PrFeCoBCuNb; anisotropic sintered magnets; magnetic stability; microstructure; permanent magnets; squareness factor; temperature 293 K to 423 K; NdFeB; PrFeB; sintered magnets; squareness factor;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2009.2025190
Filename :
5257270
Link To Document :
