HEAVY RARE EARTH ATTACHMENT METHOD FOR SINTERED NDFEB MAGNET

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A heavy rare earth attachment method for a sintered NdFeB magnet, which relates to the field of rare earth magnetic functional materials and preparation technologies. The preparation process particularly comprises the steps : placing a sintered NdFeB magnet after surface pretreatment in a heavy rare earth salt organic solution, a heavy rare earth element being deposited on a surface of the sintered NdFeB magnet under the action of a current, so as to form a dense heavy rare earth metal thin layer, and in the process of high-temperature diffusion treatment or two-stage thermal treatment comprising high-temperature diffusion and low temperature tempering, the heavy rare earth element in a heavy rare earth metal film diffusing into the magnet through a grain boundary. Coercivity of a sintered NdFeB rare earth permanent magnetic material is remarkably improved, remanence is not obviously reduced, heavy rare earth consumption is small, the process is simple and controllable, the efficiency is high, and the method is suitable for industrial production.