ANISOTROPIC COMPLEX SINTERED MAGNET COMPRISING MnBi WHICH HAS IMPROVED MAGNETIC PROPERTY AND METHOD

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PROBLEM TO BE SOLVED : To provide an anisotropic complex sintered magnet having MnBi, capable of replacing the conventional rare-earth bond magnet because the anisotropic complex sintered magnet having MnBi is improved in a low saturation magnetization value of MnBi and achieves very excellent magnetic properties in a temperature range of from an ambient temperature (25°C) to a high temperature (150°C), and to provide a method for preparing the anisotropic complex sintered magnet having MnBi. SOLUTION : A method of preparing an anisotropic complex sintered magnet having MnBi according to the present invention includes the steps of : (a) preparing a non-magnetic phase MnBi-based ribbon by a rapidly solidification process (RSP); (b) subjecting the non-magnetic phase MnBi-based ribbon to heat treatment to convert the non-magnetic phase MnBi-based ribbon into a magnetic phase MnBi-based ribbon; (c) grinding the magnetic phase MnBi-based ribbon to form MnBi hard magnetic phase powder; (d) mixing the MnBi hard magnetic phase powder with rare-earth hard magnetic phase powder; (e) magnetic field molding the mixture obtained in the step (d) by applying an external magnetic field to form a molded article; and (f) sintering the molded article. SELECTED DRAWING : Figure 4 COPYRIGHT : (C)2016, JPO&INPIT