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

摘要

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.