MAGNETIC SUBSTANCES BASED ON MN-BI, FABRICATION METHOD THEREOF, SINTERED MAGNET BASED ON MN-BI AND

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A fabrication method of a MnBi-based magnetic substance according to the present invention comprises : (a) a step of simultaneously melting a manganese-based material and a bismuth-based material to form a composite molten liquid; (b) a step of cooling the composite molten liquid to form a nonmagnetic MnBi-based ribbon; and (c) a step of performing a heat treatment on the nonmagnetic MnBi-based ribbon to transform the nonmagnetic MnBi-based ribbon into a magnetic MnBi-based ribbon. A fabrication method of a sintered MnBi-based magnet comprises : (a) a step of grinding the MnBi-based magnetic substance to form magnetic powder; (b) a step of molding the magnetic powder while applying a magnetic field; and (c) a step of sintering the magnetic powder. The sintered MnBi-based magnet by the fabrication method has an excellent magnetic property even at a high temperature, and thus can replace a rare earth-based permanent magnet.(AA) Mn powder and Bi powder(BB) Rapid heating (induction heating)(CC) Molten liquid of composite powder(DD) Rapid cooling (RSP)(EE) Nonmagnetic MnBi-based ribbon(FF) Low-temperature heat treatment (LTP)(GG) Magnetic MnBi-based ribbon (MnBi-based magnetic substance)(HH) Grinding (milling)(II) MnBi-based magnetic powder(JJ) Molding and rapid sintering(KK) Sintered MnBi-based magnetCOPYRIGHT KIPO 2015