SURFACE TREATMENT METHOD AND PREPARATION METHOD OF A SINTERED NDFEB MAGNET

摘要

A surface treatment method and a preparation method of a sintered NdFeB magnet. The surface treatment method comprising: dipping, coating or spraying a solution containing at least one of Dy and Tb onto the surface of the sintered NdFeB magnet, diffusion processing the sintered NdFeB magnet in a non-oxidizing environment. The intrinsic coercive force can be improved while the maximum energy product of the sintered NdFeB magnet is held on the basis of the surface treatment method and the preparation method.