Abstract
Methods for preparing Mn-Bi and Mn-Al alloys and producing magnets from Mn-Bi alloys have been studied. A Mn-Bi alloy of high purity was prepared by sintering powders of Mn and Bi at 260°C for about 1000 hrs. Ferromagnetic Mn-Al alloys were prepared by quenching and tempering, and the influences of the temperatures of these treatments on the magnetic properties of the ferromagnetic Mn-Al alloy were studied in detail. To pulverize the Mn-Bi compound a hammer mill was used in an Argon atmosphere, and this gave good results. Mn-Bi magnets were produced by compressing power containing about 8% of resin at 200°C, and curing at 100°C. To obtain good magnetic properties, the magnetic field applied during compression should be 9,000 Oe or stronger. A magnet thus prepared has a Br of 2,500 to 3,800 gauss, and a BBC of 1,200 to 2,600 Oe. The thermal coefficient of remanence was about −1.23×10−3 gauss/°C.
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