R-Fe-B-based method for manufacturing sintered rare earth 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, an R-Fe-B based rare earth sintered magnet body is prepared, and Dy is electrodeposited on the surface of the R-Fe-B based rare earth sintered magnet body by performing electrolysis in fused salt containing Dy ions. Thereafter, Dy is diffused into the R-Fe-B based rare earth sintered magnet body by heating it. COPYRIGHT : (C)2008, JPO&INPIT