DocumentCode
1449849
Title
Dependence of the coercivity HcJ of high energy Nd-Fe-B magnets on the alignment coefficient
Author
Rodewald, W. ; Katter, M. ; Wall, B. ; Blank, R. ; Reppel, G.W. ; Zilg, H.D.
Author_Institution
Vacuumschmelze GmbH, Hanau, Germany
Volume
36
Issue
5
fYear
2000
fDate
9/1/2000 12:00:00 AM
Firstpage
3279
Lastpage
3281
Abstract
Sintered Nd-Fe-B near net-shape magnets with a high remanent polarization of 1.37 T, a coercivity HcJ of 9.6 kA/cm (12 kOe) and a maximum energy density of 420 kJ/m3 (53 MGOe) are manufactured by rubber isostatic pressing. The optimization of the remanent polarization by an improved alignment process of the powder particles resulted in a decrease of the coercivity by 0.4 kA/cm per% Δfφ for alignment coefficients in the range 96-98%. For alignment coefficients between 98-99% the decrease of the coercivity even amounts to about -1 kA/cm per% Δfφ. The temperature coefficients of such magnets amount to -0.11%/K for the remanent polarization and to -0.77%/K for the coercivity in the temperature range 20-100°C
Keywords
boron alloys; coercive force; ferromagnetic materials; iron alloys; neodymium alloys; permanent magnets; remanence; sintering; Nd-Fe-B; alignment coefficient; alignment coefficients; coercivity; high energy Nd-Fe-B magnets; high remanent polarization; maximum energy density; rubber isostatic pressing; sintered Nd-Fe-B near net-shape magnets; Anisotropic magnetoresistance; Coercive force; Iron; Magnetic fields; Magnets; Manufacturing; Neodymium; Polarization; Powders; Temperature distribution;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.908769
Filename
908769
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