| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of a rare earth sintered magnet in which magnetic characteristic thereof can be improved.
SOLUTION : A manufacturing method of a rare earth sintered magnet, the rare earth sintered magnet including a main phase having R2T14B compounds (where R represents one or more rare earth elements, T represents one or more transition metal elements including Fe, or Fe and Co, and B represents B, or B and C) and a grain-boundary phase having a larger amount of R than the R2T14B compound, comprises : an adhesion process of heavy rare earth compounds in which a rare earth compound contained solution including the heavy rare earth compounds is adhered onto a surface of the rare earth sintered magnet body including a composition of a R2T14B phase; and a heat treatment process for heat treating the rare earth sintered magnet body on which the heavy rare earth compounds are adhered. A squareness ratio Hk/HcJ of the heat treated rare earth sintered magnet body becomes 0.8 or more and less than 1.0 compared to a squareness ratio Hk/HcJ of the heat treated rare earth sintered magnet body obtained in a sintering condition in which the squareness ratio becomes the largest after the heat treatment.
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