Title :
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
fDate :
3/1/1994 12:00:00 AM
Abstract :
Hot rolling of cast Nd16.5Fe77.5B6 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; Nd16.5Fe77.5B6; 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;
Journal_Title :
Magnetics, IEEE Transactions on
