R-T-B BASED SINTERED MAGNET AND MANUFACTURING METHOD THEREOF

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PROBLEM TO BE SOLVED : To provide a manufacturing method of an R-T-B based sintered magnet having high Br and high HcJ while reducing the content of heavy rare earth elements. SOLUTION : A manufacturing method of an R-T-B based sintered magnet according to the present disclosure includes a steps of preparing an R1-T1-B based sintered body, a step of preparing an R2-Si based alloy, and step of bringing at least a part of the alloy into contact with at least a part of the surface of the sintered body and performing heat treatment at a temperature of 450°C or more and 1100°C or less in a vacuum or an inert gas atmosphere. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2019, JPO&INPIT