| 摘要 |
The invention relates to a method of manufacturing high-performance neodymium iron boron permanent magnet material, which improves the coercive force of a magnet by replacing Dy with heavy rare earth element Tb, and simultaneously reduces the production cost by replacing Nd with a small amount of Pr. The neodymium iron boron permanent magnet material containing Pr and Tb comprises (Nd,Pr)x, Feresidual, By, Dyz, Tbu, Coy, and Alw; the atomic percents of the elements are respectively 7≦̸x≦̸15, 5.5≦̸y≦̸8, 0.05≦̸z≦̸6, 0≦̸u≦̸2, 0≦̸v≦̸3, 0≦̸w≦̸1.5 and Fe and inducted impurity from raw material for the residual. The compounding, smelting, dusting, moulding and sintering processes are performed according to the atomic percents. The added Tb improves the anisotropy field of the molecule of the magnet, therefore, the coercive force of the magnet is obviously improved. Simultaneously, as the anisotropy field of the magnetocrystalline of Pr2Fe14B is slightly higher than that of Nd2Fe14B, and the small amount of added Pr also slightly improves the coercive force of the magnet.
|
