METHOD FOR PREPARING RARE EARTH PERMANENT MAGNET MATERIAL

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A method for preparing rare earth permanent magnet material, comprising : firstly weighing powders of three raw materials, H, M and Q, according to the atomic percentage content in general formula H100-x-yMxQy, and performing the mixing treatment and sieving treatment in a nitrogen gas or other oxygen-free environments to obtain a composite powder; then machining a sintered NdFeB magnet into a prescribed shape and size, and performing the surface cleaning and drying to obtain a NdFeB magnet to be treated; next, adhering the composite powder to the surface of the NdFeB magnet to be treated by static electricity in an oxygen-free environment; next performing a vacuum thermal treatment and tempering treatment sequentially thereby obtaining the rare earth permanent magnet material. For the above method, the efficiency is high and binding force between the heavy rare earth element attachments and the substrate magnet is strong, it is convenient for the residual powder materials to be recycled. The coercivity of the prepared NdFeB magnet can be increased by 4000-14000 Oe, the remanence is only reduced by 1-2%, and the magnet with equivalent performance can be saved 30% of the heavy rare earth usage amount.