Microstructure and magnetic properties of anisotropic NdFeB powders from hot rolled ingots by HD process

Author

Hinz, D. ; Handstein, A. ; Harris, L.R.

Author_Institution

Inst. fur Festkorper und Werkstofforschung e.V., Dresden, Germany

Volume

30

Issue

2

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

601

Lastpage

603

Abstract

Hot rolling of cast Nd_16.5Fe_77.5B₆ ingots wrapped in iron was used to produce anisotropic magnets as starting material for anisotropic powder. After application of the HD process the NdFeB powder could be easily removed from the sheath. Metallographic and SEM investigations showed a great variety of particle shapes and sizes. Predominantly needle- and shell-shaped particles with medium particle sizes of about 160 μm were formed with their magnetically easy axis perpendicular to the great half axis. To produce anisotropic bonded magnets the aligning magnetic field has to be applied parallel to the pressure direction

Keywords

boron alloys; crystal microstructure; ferromagnetic properties of substances; iron alloys; magnetic anisotropy; magnetic properties of fine particles; neodymium alloys; powders; scanning electron microscope examination of materials; HD process; Nd_16.5Fe_77.5B₆; NdFeB; SEM; anisotropic powders; hot rolled ingots; metallographic investigations; microstructure; particle size; Anisotropic magnetoresistance; High definition video; Iron; Magnetic materials; Magnetic properties; Magnets; Microstructure; Neodymium; Powders; Shape;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312348

Filename

312348