NdFeB based magnets prepared from nanocrystalline powders with various compositions and particle sizes by spark plasma sintering

摘要: Isotropic NdFeB permanent magnets were prepared by spark plasma sintering. Melt spun ribbons with two compositions and four particle size ranges, i.e. 200–400, 100–200, 45–100 0·8 T maximum energy product (BH)max>100 kJ m−3 obtained. The influence of on the magnetic properties is not very significant. For single phase alloys stoichiometric 2∶14∶1 composition, because deficiency Nd rich phases, it relatively difficult to consolidate microsized powders into high density bulk magnet, but generally, a larger beneficial achieve better properties, including higher Jr (BH)max.