Title :
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
fDate :
9/1/1989 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
