Title :
High coercivity Nd-Fe-B sintered magnet containing vanadium with new microstructure
Author :
Sagawa, M. ; Tenaud, P. ; Vial, F. ; Hiraga, K.
Author_Institution :
Intermetallics Co. Ltd., Kyoto, Japan
fDate :
9/1/1990 12:00:00 AM
Abstract :
It is shown experimentally that an addition of a large amount of refractory elements, especially vanadium, in combination with a proper amount of boron is very effective in enhancing the coercivity of sintered Nd-Fe-B permanent magnets. A magnet consisting of Nd16 Fe72V4B8 which has a coercivity as high as 1.38 MA/m consists of three phases, Nd2Fe14 B, an Nd-rich phase, and V2FeB2, instead of Nd1.1Fe4B4 which is contained in conventional Nd-Fe-B magnets
Keywords :
boron alloys; coercive force; ferromagnetic properties of substances; grain boundaries; iron alloys; neodymium alloys; permanent magnets; scanning electron microscope examination of materials; sintering; transmission electron microscope examination of materials; vanadium alloys; 1040 to 1120 C; 500 to 700 C; EDAX; Nd16Fe72V4B8 permanent magnets; NdFeB magnets; SEM micrograph; TEM micrograph; annealing; electron diffraction; grain boundaries; high coercivity sintered magnet; magnetic hardening; microstructure; refractory elements; Annealing; Coercive force; Magnetic anisotropy; Magnetic fields; Magnetic properties; Microstructure; Permanent magnets; Perpendicular magnetic anisotropy; Powders; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
