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Preparation and Magnetic Properties of MnBi Alloy and its Hybridization with NdFeB

  • Truong, Nguyen Xuan (Institute of Materials Science, Vietnam Academy of Science and Technology) ;
  • Vuong, Nguyen Van (Institute of Materials Science, Vietnam Academy of Science and Technology)
  • 투고 : 2015.08.07
  • 심사 : 2015.10.13
  • 발행 : 2015.12.31

초록

MnBi alloys were fabricated by arc melting and annealing at 573 K. The heat treatment enhanced the content of the low-temperature phase (LTP) of MnBi up to 83 wt%. The Bi-excess assisted LTP MnBi alloys were used in the hybridization with the Nd-Fe-B commercial Magnequench ribbons to form the hybrid magnets (100-x)NdFeB/xMnBi, x = 20, 30, 40, 50, and 80 wt%. The as-milled powder mixtures of Nd-Fe-B and MnBi were aligned in a magnetic field of 18 kOe and warm-compacted to anisotropic and dense bulk magnets at 573 K by 2,000 psi for 10 min. The magnetic ordering of two hard phase components strengthened by the exchange coupling enhanced the Curie temperature ($T_c$) of the magnet in comparison to that of the powder mixture sample. The prepared hybrid magnets were highly anisotropic with the ratio $M_r/M_s$ > 0.8. The exchange coupling was high, and the coercivity $_iH_c$ of the magnets was ~11-13 kOe. The maximum value of the energy product $(BH)_{max}$ was 8.4 MGOe for the magnet with x = 30%. The preparation of MnBi alloys and hybrid magnets are discussed in details.

과제정보

연구 과제 주관 기관 : Vietnam National Foundation for Science and Technology Development (NAFOSTED)

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피인용 문헌

  1. Preparation and Magnetic Properties of MnBi/Co Nanocomposite Magnets vol.46, pp.6, 2017, https://doi.org/10.1007/s11664-017-5345-8
  2. Relating atomic local structures and Curie temperature of NdFeB permanent magnets: an X-ray absorption spectroscopic study pp.1867-7185, 2017, https://doi.org/10.1007/s12598-017-0918-5