Microstructural and magnetic properties of low-energy ball milled LTP-MnBi powders via melt-spinning and gas-atomization

초록

LTP-MnBi alloy presents many possibilities as a 'gap-magnet' material due to its excellent magnetic properties compared to M-type ferrite. However, the LTP-MnBi alloy has a critical problem of the phase decomposition in a milling process for improving magnetic properties. In this study, the MnBi alloy was manufactured by both the melt-spinning process and the gas-atomization process to overcome the above problem. As a result, it was confirmed that single-phase LTP-MnBi powders were obtained through heat treatment even in gas-atomization with a relatively low cooling rate. In addition, these MnBi powders had a spherical shape of about 20 μm or less even before milling. Thus, it was possible to minimize the decomposition of the LTP-MnBi phase. These powders showed an excellent maximum energy product (11.3 MGOe). © 2023 IEEE.

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