Method for improving rare earth magnet coercivity

The invention discloses a method for improving the rare earth magnet coercivity. The method comprises the following steps that 101, a presintered magnet is prepared, wherein the density of the presintered magnet is lower than 7.9 g/cm ; 102, a diffusion coating solution is prepared, wherein the diffusion coating solution does not contain heavy rare earth elements; 103, the presintered magnet is coated with the diffusion coating solution; 104, the presintered magnet is subjected to heat treatment. According to the method for improving the rare earth magnet coercivity, precious rare earth elements are not needed, additional equipment except for an ordinary grain boundary diffusion technology is not needed, and the residual magnetism and the square degree of the magnet are not lowered or lowered very little. 本发明公开了种提高稀土磁体矫顽力的方法，所述方法包括如下步骤:步骤101，准备预烧结磁体，其中所述预烧结磁体的密度低于7.9g/cm；步骤102，准备扩散涂覆液，所述覆涂液中不含重稀土元素；步骤103，对所述预烧结磁体涂覆所述扩散涂覆液；步骤104，对所述预烧结磁体进行热处理。本发明提高稀土磁体矫顽力的方法无需使用贵重的稀土元素，也无需使用常规晶界扩散工艺之外的额外的设备，并且磁体剩磁和方形度没有降低或降低极少