PRODUCTION METHOD OF R-T-B SYSTEM SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a method of producing an R-T-B system sintered magnet having further high magnetic characteristics by a mixing method. SOLUTION : In the production method of the R-T-B system sintered magnet including an R2T14B compound (R is one or two or more kinds selected from rare earth elements and Y, T is Fe or Fe and Co) as a main phase and including grain boundary phases between the R2T14B compounds, the R-T-B system sintered magnet includes 25 to 32.5wt.% R and a process of producing a molding including alloy powder for the main phase and alloy powder for the grain boundary phases and a process of sintering the molding are included. The alloy powder for the grain boundary phases contains 25 to 42wt.% heavy rare earth elements. The crystal grains of the R-T-B system sintered magnet are made finer by the invention and coercive force (HcJ) can be made better with substantially no degradation in residual magnetic flux density (Br). COPYRIGHT : (C)2007, JPO&INPIT