| 简介 |
PROBLEM TO BE SOLVED : To provide : an Mn-Bi based magnetic material which is superior in high-temperature magnetic property and which can make an alternative of a conventional rare earth based permanent magnet; a method for manufacturing such an Mn-Bi based magnetic material; an Mn-Bi based sintered magnet; and a method for manufacturing such a sintered magnet.
SOLUTION : A method for manufacturing an Mn-Bi based magnetic material according to the present invention comprises : (a)a step for manufacturing a mixture molten liquid by melting an Mn(manganese) based substance and a Bi(bismuth) based substance at a time; (b)a step for cooling the mixture molten liquid, thereby forming a non-magnetic phase Mn-Bi based ribbon; and (c)a step for performing a thermal treatment on the non-magnetic phase Mn-Bi based ribbon, thereby causing the non-magnetic phase Mn-Bi based ribbon to transition into a magnetic phase Mn-Bi based ribbon. A method for manufacturing an Mn-Bi based sintered magnet according to the present invention comprises : (a)a step for pulverizing an Mn-Bi based magnetic material into magnetic powder; (b)a step for compacting the magnetic powder with a magnetic field applied thereto; and (c)a step for sintering a compact of the magnetic powder.
SELECTED DRAWING : Figure 1
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