Title :
Microstructure and magnetic properties of high-remanence Nd5 Fe71.5Co5B18.5M (M=Al, Si, Ga, Ag, Au) rapidly solidified and crystallized alloys for resin-bonded magnets
Author :
Kanekiyo, H. ; Uehara, M. ; Hirosawa, S.
Author_Institution :
Sumitomo Special Metals Co. Ltd., Osaka, Japan
fDate :
11/1/1993 12:00:00 AM
Abstract :
High-remanence, isotropic magnetic powder of a low rare earth content is developed for resin-bonded magnet applications. The materials are based on a metastable Fe(Fe, Co)3B-Nd2Fe14B nanocrystalline mixture with the addition of a small amount of one of Al, Si, Cu, Ga, Ag, and Au. The effects of the additives on the microstructure are investigated by means of transmission electron microscopy. It is found that the additives considerably reduce grain sizes, which results in improvements in the hysteresis squareness of the material. The magnetic properties of a bonded magnet produced from Nd4.5Fe73Co3 Ga1B18.5 are described in detail
Keywords :
alloying additions; aluminium alloys; boron alloys; cobalt alloys; ferromagnetic properties of substances; gallium alloys; gold alloys; grain size; iron alloys; magnetic hysteresis; nanostructured materials; neodymium alloys; permanent magnets; powder metallurgy; rapid solidification; remanence; silicon alloys; silver alloys; transmission electron microscope examination of materials; Nd5Fe71.5Co5B18.5Al; NdFeCoBGa; NdFeCoBSi; additives; crystallized alloys; grain sizes; high-remanence Nd5Fe71.5Co5B18.5M; hysteresis squareness; isotropic magnetic powder; magnetic properties; metastable Fe(Fe, Co)3B-Nd2Fe14B nanocrystalline mixture; microstructure; rapidly solidified alloys; resin-bonded magnets; transmission electron microscopy; Additives; Electrons; Gold; Iron; Magnetic materials; Magnetic properties; Metastasis; Microstructure; Neodymium; Powders;
Journal_Title :
Magnetics, IEEE Transactions on
