PROCESS FOR PRODUCING R-Fe-B BASED RARE EARTH SINTERED MAGNET

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PROBLEM TO BE SOLVED : To enhance coercive force while controlling fall of residual magnetic flux density by forming main phase crystal grains where Dy is condensed at the shell efficiently, even in an R-Fe-B based rare earth sintered magnet body. SOLUTION : In the process for producing an R-Fe-B based rare earth sintered magnet, at least one R-Fe-B based rare earth sintered magnet body is prepared having main phase of R2Fe14B type compound crystal grain containing a light rare earth element RL (at least one kind of Nd and Pr) as main rare earth element R. Subsequently, Dy is electrodeposited on the surface of the R-Fe-B based rare earth sintered magnet body by performing electrolytic plating in plating liquid containing organic solvent and Dy ions. Thereafter, Dy is diffused into the R-Fe-B based rare earth sintered magnet body by heating the R-Fe-B based rare earth sintered magnet body in which Dy is electrodeposited on the surface. COPYRIGHT : (C)2008, JPO&INPIT