METHOD FOR MANUFACTURING RARE EARTH PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide a method for manufacturing an R-Fe-B based sintered magnet which makes possible to surely obtain an R-Fe-B based sintered magnet having a high residual magnetic flux density and a high coercive force and to manufacture an R-Fe-B based sintered magnet efficiently and economically by efficiently reducing the amount of use of expensive powder including a rare earth element without worsening the magnetic property. SOLUTION : A method for manufacturing an R-Fe-B based sintered magnet comprises the steps of : partially immersing a sintered magnet body 2 including an R1-Fe-B based composition (where R1 represents at least one element selected from rare earth elements including Y and Sc) in an electrodeposition solution 1 having powder including at least one kind of material selected from an oxide of R2, a fluoride of R3, an acid fluoride of R4, a hydride of R5, and a rare earth alloy of R6 (where R2, R3, R4, R5 and R6 are each at least one element selected from rare earth elements including Y and Sc) distributed in a solvent; causing the powder to deposit to a predetermined range of a surface of the sintered magnet body by electrodeposition; and performing a thermal treatment at a temperature equal to or lower than a sintering temperature of the magnet in vacuum or inert gas. COPYRIGHT : (C)2015, JPO&INPIT