Effect of pre-alloy composition on the content of ferromagnetic phase of MnBi melt spun ribbons

Truong Xuan  Nguyen; Ca Xuan Nguyen; Tung Thanh Nguyen; Vuong Van Nguyen

doi:10.15625/2525-2518/58/2/14431

Author affiliations

Authors

Truong Xuan Nguyen Institute of Materials Science, Vietnam Academy ofScience and Technology, 18 Hoang Quoc Viet Street, Cau Giay, Ha Noi, Viet Nam
Ca Xuan Nguyen Thai Nguyen University of Science, Thai Nguyen University, Tan Thinh Ward, Thai Nguyen City, Viet Nam
Tung Thanh Nguyen Faculty of Engineering Physics and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy, Cau giay, Ha Noi, Viet Nam
Vuong Van Nguyen Institute of Materials Science, Vietnam Academy ofScience and Technology, 18 Hoang Quoc Viet Street, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/58/2/14431

Keywords:

MnBi hard magnetic material, MnBi LTP, spontaneous magnetization, MnBi melt – spun ribbons

Abstract

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 M_s ~ 74 emu/g, the high magneto-crystalline energy K_a of ~ 0.9 MJ/m³, and the elevated Curie temperature T_c ~ 360 ^oC and especially, the positive thermal coefficient of coercivity d(_iH_c)/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 T_m 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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