RE-Fe-B BASED RARE EARTH MAGNET BY GRAIN BOUNDARY DIFFUSION OF HAEVY RARE EARTH AND MANUFACTURING ME

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The present invention relates to a RE-Fe-B based rare earth magnet by grain boundary diffusion of heavy rare earth and manufacturing methods thereof. Specifically, the invention is to solve the problem of not having enough magnet property because residual stress is concentrated on the magnet surface when manufacturing RE-Fe-B based rare earth magnet by grain boundary diffusion of heavy rare earth with reduced amount of heavy rare earth. The invention is to manufacture a product with even and solid quality. The invention uses the minimum amount of heavy rare earth and increases coercive force when manufacturing the RE-Fe-B based rare earth magnet by grain boundary diffusion of heavy rare earth and for the manufacturing methods. The manufacturing methods of the RE-Fe-B based rare earth magnet by grain boundary diffusion of heavy rare earth comprises : a S1 step of manufacturing, degreasing, solvent cleansing and cleaning of the product in accordance with the product size by using a rare earth magnet pellet, composed of Re-Fe-TM-B (RE=rare earth element, Fe=iron, TM=3d transition element, B=boron); a S2 step of covering the surface of the cleaned product from the S1 step with material containing heavy rare earth; and a S3 step of charging the covered material from the S2 step in a furnace and executing grain boundary diffusion of heavy rare earth in the range of 650~950 ° C in vacuum or an inert gas.COPYRIGHT KIPO 2015