Production flow diagram of MnAl magnets Sample Clauses

Production flow diagram of MnAl magnets. Fig.2 Phase diagram of Mn-Al system Manganese bismuth bulk magnets were developed by the U.S. Naval Surface Weapons Center. Because the MnBi alloy shows a complex phase transformation around ferromagnetic phase ( -BiMn in Fig.4), which is called LTP (Low Temperature Phase) as well. It is not easy to obtain a pure MnBi ferromagnetic phase. Xxxxxx et al. proposed the improved fabrication process to obtain MnBi ferromagnetic phase with high yield [3]. The powder metallurgy process was employed and the bonded magnets were made. The process flow was summarized in Fig. 3. The mixture of Mn and Bi metallic powders was compacted and heat-treated at 250-260℃. The reaction was limited to temperature lower than the eutectic temperature (535K). Low temperature reaction enabled to high yield of the ferromagnetic phase.