Al-doped Nd-Fe-B permanent magnets: wetting and microstructural investigations

Author

Knoch, K.G. ; Schneider, G. ; Fidler, J. ; Henig, E. Th ; Kronmüller, H.

Author_Institution

Max-Planck-Inst. fuer Metallforschung, Stuttgart, West Germany

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3426

Lastpage

3428

Abstract

The coercivity of Nd-Fe-B sintered magnets has been improved by Al additions. To study the microstructural effect of Al addition, two types of investigation were formed: (1) the change in the wetting behavior of the liquid phase, at the sintering temperature, was studied by measurements of the wetting angle; and (2) the microstructural changes resulting from Al additions were studied by transverse electron microscopy assisted by energy dispersive X-ray analysis. A systematic change was detected that depended on the kind of Al addition, i.e., metallic or as Al₂O₃

Keywords

X-ray chemical analysis; aluminium alloys; boron alloys; coercive force; crystal microstructure; ferromagnetic properties of substances; iron alloys; neodymium alloys; permanent magnets; sintering; transmission electron microscope examination of materials; wetting; NdFeB:Al permanent magnet; TEM; energy dispersive X-ray analysis; liquid phase wetting behaviour; microstructural effect; sintered magnet coercivity; sintering temperature; transverse electron microscopy; wetting angle; Atmosphere; Coercive force; Electrons; Land surface temperature; Magnetic properties; Microstructure; Optical microscopy; Permanent magnets; Phase measurement; Temperature measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42323

Filename

42323