本发明提供了一种具有高矫顽力的无稀土 MnBiMg永磁合金及其制备方法。首先将Mn、Bi和 Mg按照预制比例混合，得到母合金原料，在真空 环境和惰性气体保护下，对母合金原料进行真空 感应熔炼，得到合金锭，然后将合金锭破碎成小 块，再次进行真空感应熔炼，重熔数次后得到最 终合金锭，最后将最终合金锭在真空环境下进行 均匀化退火，即得MnBiMg永磁合金，其中，预制比 例为Mn、Bi和Mg的原子个数比为55：45‑x：x，x＝ 1 ,2 ,3 ,4。与现有技术相比，本发明制得的MnBiMg 永磁合金具有高矫顽力、较高磁能积和优良的综 合磁性能。此外，本发明的制备方法成本低廉，操 作简便。 

The present invention provides a rare-earth-free with high coercivity MnBiMg permanent magnet alloy and its preparation method. Firstly, Mn, Bi and Mg are mixed according to a pre-preparation ratio to obtain the master alloy raw material, and under a vacuum environment and under the protection of inert gas, the mother alloy material is vacuum Under the protection of vacuum environment and inert gas, the mother alloy raw material is subjected to vacuum induction melting to obtain the alloy ingot, and then the alloy ingot is crushed into small Then the alloy ingot is broken into small pieces, and then vacuum induction melting is carried out again, and the final alloy ingot is obtained after remelting for several times.Finally, the final alloy ingot is annealed under vacuum for homogenization.Finally, the final alloy ingot is homogenized and annealed in a vacuum environment to obtain the MnBiMg permanent magnet alloy, in which the prefabrication ratio is For example, the atomic number ratio of Mn, Bi and Mg is 55:45-x:x, x=1 ,2 ,3 ,4 . Compared with the prior art, the MnBiMg permanent magnet alloy produced by the present invention has a high coercivity.

MnBiMg permanent magnet alloy produced by the present invention has high coercivity, high magnetic energy product and excellent comprehensive magnetic properties.

The MnBiMg permanent magnet alloy produced by the present invention has high coercivity, high magnetic energy area and excellent comprehensive magnetic properties. In addition, the preparation method of the present invention is inexpensive and easy to operate.The preparation method of the present invention is low cost and easy to operate.