, Volume 63, Issue 5–6, pp 462–468 | Cite as

Production of Permanent Magnets for Magnetically Hard Alloys Using Rare-Earth Metals

  • S. S. ShumkinEmail author
  • P. A. Prokof’ev
  • M. Yu. Semenov

A requirement for improving powder metallurgy technology of alloys for permanent magnets containing rare-earth metals based on the use of secondary resources and a replacement of rare-earth metals and fine control of the semifinished products chemical composition is demonstrated. These approaches are realized successfully in the preparation of Nd–Fe–B system magnetically hard materials by a binary mixture method using rare earth metal hydrides and their alloys. Analysis of the magnetic properties of Sm–Co–Cu–Fe–Zr system permanent magnets according to the results of the primary ingot chemical composition control minimizes production costs.


permanent magnets rare-earth metals samarium-cobalt system neodymium-iron-boron system powder metallurgy secondary resources 


  1. 1.
    W. Rodewald, B. Wall, M. Katter, and K. Uestuener, “Top Nd–Fe–B magnets with greater than 56 MGOe energy density and 9.8 kOe coercivity,” IEEE Transactions on Magnetics,38, No. 5, 2955–2957 (2002).CrossRefGoogle Scholar
  2. 2.
    Y. Kaneko, F. Kuniyoshi, and N. Ishigaki, “Proven technologies on high performance Nd–Fe–B sintered magnets,” J. of Alloys and Compounds,408, 1344–1349 (2006).CrossRefGoogle Scholar
  3. 3.
    V. B. Kondrat’ev, “Global market for rare earth element,” Gorn. Prom., No. 4 (134), 48–54 (2017).Google Scholar
  4. 4.
    V. A. Kuchumov and S. S. Shumkin, “Analysis of the chemical composition of original alloy during the production of permanent magnets made of alloys of the Sm–Co system,” Nauch. Ved. SPbPU, Estest. Inzh. Nauki, No. 1, 219–225 (2017).Google Scholar
  5. 5.
    S. S. Shumkin and V. L. Shper, “Dependence of magnetic properties of permanent magnets on alloys of the Sm–Co system on starting ingot chemical composition,” Probl. Chern. Met. Materialoved., No. 2, 95–99 (2017).Google Scholar
  6. 6.
    S. S. Shumkin and M. Yu. Semenov, “Determination of the chemical composition of metal permanent magnets containing rare earth metals providing optimum magnetic properties,” Probl. Chern. Met. Materialoved., No. 3, 96–100 (2018).Google Scholar
  7. 7.
    K. J. Overshott, “Magnetism: It is Permanent,” IEЕ Proceedings A,138, No. 1, 22–20 (1991).Google Scholar
  8. 8.
    X. Zhang, S. Guo, C. Yan, et al., “Improvement of the thermal stability of sintered NdFeB magnets by intergranular addition of Dy82.3Co17.7,” J. of Applied Physics,115, 17A757 (2014).CrossRefGoogle Scholar
  9. 9.
    R. S. Sheridan, I. R. Harris, and A. Walton, “The development of microstructure during hydrogenation–disproportionation– desorption–recombination treatment of sintered neodymium iron boron type magnets,” J. of Magnetism and Magnetic Materials,101, 455–462 (2016).CrossRefGoogle Scholar
  10. 10.
    W. Q. Liu, H. Sun, X. F. Yi, et al., “Coercivity enhancement in Nd–Fe–B sintered permanent magnet by Dy nanoparticles,” J. Alloys Comp.,50, 67–69 (2010).CrossRefGoogle Scholar
  11. 11.
    M. Komuro, Y. Satsu, and H. Suzuki, “Increase of coercivity and composition distribution in fluoride diffused NdFeB sintered magnets treated by fluoride solutions,” IEEE Transactions on Magnetics,46, No. 11, 3831–3833 (2010).CrossRefGoogle Scholar
  12. 12.
    W. F. Li, H. Sepehri-Amin, T. Ohkubo, et al., “Distribution of Dy in high coercivity (Nd, Dy)–Fe–B sintered magnet,” Acta Materialia,59, No. 8, 3061–3069 (2011).CrossRefGoogle Scholar
  13. 13.
    T.B. Massalski, H. Okamoto, P.R. Subramanian, L. Kacprzak, Binary Alloy Phase Diagram, ASM International, Materials Park, Ohio (1990).Google Scholar
  14. 14.
    N. V. Baranov, A. F. Gubkin, A. P. Vokhmyanin, et al., “High-field magnetization and magnetic structure of Tb3Co ,” J. of Physics: Condensed Matter.,19, 326213 (2007).Google Scholar
  15. 15.
    G. S. Burkhanov, N. B. Kolchugina, Yu. S. Koshkid’ko, et al., “Structure and phase composition of Tb3Co0.6Cu0.4 alloys for efficient additions to Nd–Fe–B sintered magnets,” in: 26th Int. Conf. on Metallurgy and Materials “METAL 2017” Proc.,2017 (January, 2017), pp. 1775–1781.Google Scholar
  16. 16.
    Y. Zhang, T. Ma, X. Liu, et al., “Coercivity enhancement of Nd–Fe–B sintered magnets with intergranular adding (Pr, Dy, Cu) – Hx powders,” J. of Magnetism and Magnetic Materials,399, 159–163 (2016).CrossRefGoogle Scholar
  17. 17.
    J. F. Herbst and W. B. Yelon, “Preferential site occupation and magnetic structure of Nd2(Cox Fe1–x )14 B systems,” J. of Applied Physics,60, No. 12, 4224–4229 (1986).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • S. S. Shumkin
    • 1
    Email author
  • P. A. Prokof’ev
    • 1
    • 2
  • M. Yu. Semenov
    • 3
  1. 1.AO SpetsmagnitMoscowRussia
  2. 2.Baikov IMET RANMoscowRussia
  3. 3.FGBOU VO I. P. Bardin TsNIIchermetMoscowRussia

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