本发明涉及一种具有高磁能积的MnBi永磁合金粉末及其制备方法与应用。其中，MnBi永磁合金粉末的组成为Mn55Bi44V1，制备方法为：按照 组成Mn55Bi44V1配置原料；将原料熔融后冷却制 得合金锭；将合金锭进行单辊旋淬制备快淬条 带；将快淬条带进行热处理得到永磁合金条带； 将永磁合金条带破碎后进行低能球磨，得到所述 的具有高磁能积的MnBi永磁合金粉末。与现有技 术相比，本发明通过低能球磨制得的MnBi合金粉 末颗粒尺寸与铁磁相LTP‑MnBi的纯度达到最优 配合，使得样品在获得高水平矫顽力同时，仍然 能够保持一个较高水平的磁化强度，磁能积得到 极大提升；制备过程简便易行，极具应用前景。

The present invention relates to a MnBi permanent magnet alloy powder with high magnetic energy product and its preparation method and application. The MnBi permanent magnetic alloy powder is composed of Mn55Bi44V1, and the preparation method is as follows: the raw materials are configured according to the composition of Mn55Bi44V1; the raw materials are melted and then cooled to produce an alloy ingot; the alloy ingot is quenched by a single-roll spinning quenching to produce a fast-quenched strip; the fast-quenched strip is heat-treated to produce a permanent magnetic alloy strip; the permanent magnetic alloy strip is crushed and then subjected to a low-energy ball milling process, so as to get the MnBi permanent magnetic alloy powder with a high magnetic energy area as described herein. The permanent magnetic alloy strip is crushed and then subjected to low energy ball milling to obtain the said MnBi permanent magnetic alloy powder with high magnetic energy product. Compared with the existing technology, the MnBi alloy powder produced by low-energy ball milling in the present invention has an optimal match between the particle size of the MnBi alloy and the purity of the ferromagnetic phase LTP-MnBi, which enables the sample to obtain a high level of coercive force while still maintaining a high level of magnetization strength, and greatly improves the magnetic energy product; the process of preparing the MnBi alloy powder is simple and easy to carry out, and is very promising for application.