Effect of pre-alloy composition on the content of ferromagnetic phase of MnBi Melt spun ribbons
Keywords:MnBi hard magnetic material, MnBi LTP, spontaneous magnetization, MnBi melt – spun ribbons
The rare-earth-free hard magnetic material MnBi is potential for permanent magnet high-temperature applications. The ferromagnetic phase (noted as a Low Temperature Phase – LTP) MnBi has the moderate spontaneous magnetization Ms ~ 74 emu/g, the high magneto-crystalline energy Ka of ~ 0.9 MJ/m3, and the elevated Curie temperature Tc ~ 360 oC and especially, the positive thermal coefficient of coercivity d(iHc)/dT > 0. Up to now, the MnBi powders with high LTP content and coercivity have usually been prepared using the melt-spinning technique. However, the large difference in the melting temperature Tm of the two constituents, Mn and Bi, and the strong reactivity of Bi with the copper-based wheel make the preparation of high-performance MnBi ribbons difficult. Using a novel approach, we overcame these difficulties and prepared the MnBi ribbons on the conventional commercial melt-spinning furnace ZGK-1. The influences of pre-alloy compositions on the magnetic properties of MnBi melt – spun ribbons will be discussed in detail.
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