The invention relates to a
grain boundary diffusion method for improving properties of sintered NdFeB magnets. The
grain boundary diffusion method comprises the following steps of stacking sintered NdFeB magnets and
diffusion alloy sheets together and placing in a hot-pressing furnace; vacuumizing the hot-pressing furnace until the vacuum degree reaches a set value, heating the hot-pressing furnace, and when the temperature of the hot-pressing furnace reaches a set value, beginning to exert a pressure and maintaining the pressure and putting the diffused sample into a high-
vacuum furnace for annealing, wherein the diffusion
alloy sheets are low-melting-point eutectic diffusion alloys and are represented by R-TM, R is one or more of Sc, Y, La, Ce, Pr or Nd and TM is one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Compared with the prior art, the sintered NdFeB magnets modified by the
pressure diffusion method, which is provided by the invention, have the advantages of large diffusion depth of a diffusion agent, uniform distribution of
grain boundary phases, high
coercivity and the like, especially, low-melting-point diffusion alloys designed by the invention are free of expensive heavy
rare earth element
dysprosium and thus the cost of the raw materials is relatively low, the diffusion temperature is low and the
energy consumption in the diffusion process is small.