Method of manufacturing a Rare Earth Sintering Magnet

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In a method for manufacturing a rare earth sintered magnet, a forming body is formed by using melting point depression metal powder to depress a melting point of a rare earth-rich phase, refractory metal sulfide powder, and light rare earth magnetic material powder. A pre-sintered body is formed by performing a sintering process on the forming body. And then, a sintered body is formed by performing an annealing process on the pre-sintered body on which a coating layer is formed, after forming the coating layer on the surface of the pre-sintered body by immersing the pre-sintered body in source solutions in which middle rare earth materials are dissolved. Accordingly, the present invention can improve coercive force while limiting the growth of a crystal grain.COPYRIGHT KIPO 2018