Method for manufacturing rare earth sintered magnet using low melting point elements

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According to the present invention, a method for preparing a sintered rare earth-based magnet according to the present invention comprises the steps of : heating an R-Fe-B based magnet powder to a predefined temperature to produce a sintered magnet, wherein R is a rare earth element or a combination of rare earth elements; coating the surface of the produced sintered magnet with a coating solution prepared by mixing a heavy rare earth powder and a melting point depression element powder in a solvent; and heat-treating the coated sintered magnet. A heavy rare earth element is efficiently diffused on the interface of the sintered magnet to improve the coercive force of the sintered magnet.(AA) Start(BB) End(S110) Heating R-Fe-B based magnet powder, and producing a sintered magnet(S120) Producing a coating solution by mixing a rare earth compound, alloy powder, and melting point depression element powder in a solvent(S130) Coating the surface of the sintered magnet with the produced coating solution(S140) Heat-treating the coated sintered magnetCOPYRIGHT KIPO 2017