Fabrication of anisotropic NdCeFeB hybrid magnets by hot-deformation: microstructures and magnetic properties

An experimental study is performed on Ce-based NdCeFeB hybrid nanostructure magnets. The hybrid magnets were prepared using a mixture of NdFeCoB and CeFeB melt-spun ribbons with different ratios, followed by hot-pressing and subsequently hot-deformation, in which a certain amount of Nd is substituted by Ce. For comparison, single magnets using NdCeFeB melt-spun ribbons directly as the starting material, with the same Ce composition, were also prepared under the same conditions. The results show that the magnetic properties and Curie temperature decrease with increasing Ce content. The hybrid magnets have a layered structure, in which alternating layers of the two starting alloys lay perpendicular to the pressing direction. As a consequence, the hybrid magnets have better magnetic properties than the single magnets with the same Ce content when the Ce content is less than 40%. With a Ce content of 20% by weight ratio, the (BH)(max) value of the hybrid magnet was 32.7 MGOe, compared to 23.6 MGOe for the single magnet.