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Metal Science and Heat Treatment

, Volume 60, Issue 7–8, pp 528–533 | Cite as

Structure and Properties of R – (Fe, Co) – B (R = Nd, Dy, Ho) Permanent Magnets with Low Temperature Coefficient of Induction

  • A. G. Popov
  • D. A. Kolodkin
  • V. S. Gaviko
  • D. Yu. Vasilenko
  • A. V. Shitov
Article
  • 10 Downloads

Two groups of sintered permanent magnets with reduced temperature coefficient of induction (TCI) are considered, i.e., (A ) (Nd0.64Dy0.36)16(Fe1 – xCox)77.5Cu0.1Ga0.3B6.1(x = 0.22 – 0.36) and (B) Nd0.64 – zDy0.36Hoz)16(Fe0.64Co0.36)77.5Cu0.1Ga0.3B6.1 ( z = 0.08 – 0.26). It is shown that substitution of 36% Fe by Co raises the Curie temperature of the magnets to 576°C and lowers the TCI to ∣ − 0.02 ∣  % /K in the range of 27 – 120°C. Substitution of Nd by Ho lowers the TCI additionally to zero at z = 0.17 and changes it to ∣ + 0.009 ∣  % /K at z = 0.26. The results of the study of the phase composition and of the microstructure of the magnets make it possible to explain the observed lowering of the coercivity under the alloying.

Key words

permanent magnet coercivity magnetic susceptibility Curie temperature temperature coefficient of induction 

Notes

The work has been performed within a State Assignment of the Federal Agency of Scientific Organizations of Russia (topic “Magnet” No. AAAA-A18-118020290129-5) with partial support of the Ural Branch of the Russian Academy of Sciences (Project No. 18-10-2-5).

References

  1. 1.
    M. Sagawa, S. Fujimura, N. Togawa, et al., “New material for permanent magnets on a base of Nd and Fe,” J. Appl. Phys., 55(6), 2083 – 2087 (1984).CrossRefGoogle Scholar
  2. 2.
    Y. Matsuura, “Recent development of Nd – Fe – B sintered magnets and their applications,” J. Magn. Magn. Mater., 303, 344 – 347 (2006).CrossRefGoogle Scholar
  3. 3.
    R. M. W. Strnat, S. Liu, and K. J. Strnat, “Thermal stability and temperature coefficients of four rare-earth-cobalt matrix magnets heated in dry air,” J. Appl. Phys., 53, 2380 – 2382 (1982).CrossRefGoogle Scholar
  4. 4.
    Y. Matsuura, S. Hirosawa, H. Yamamoto, et al., “Magnetic properties of the Nd2(Fe1 – xCox)14B system,” J. Appl. Phys. Lett., 46(3), 308 – 310 (1985).CrossRefGoogle Scholar
  5. 5.
    B. Ma, K. S. V. L. Narasimhan, “Temperature dependence of magnetic properties of Nd – Fe – B magnets,” J. Magn. Magn. Mater., 54 – 57, 559 – 562 (1986).CrossRefGoogle Scholar
  6. 6.
    W. Li, L. Jiang, D. Wang, et al., “Rare-earth-transition-metalboron permanent magnets with smaller temperature coefficients,” J. Less-Common Met., 126, 95 – 100 (1986).CrossRefGoogle Scholar
  7. 7.
    M. Sagawa, S. Hirosawa, H. Yamamoto, et al., “Nd – Fe – B permanent magnet materials,” Jap. J. Appl. Phys., 26(6), 785 – 800 (1987).CrossRefGoogle Scholar
  8. 8.
    J. F. Herbst, “R2Fe14B materials: Intrinsic properties and technological aspects,” Rev. Mod. Phys., 63(4), 819 – 898 (1991).CrossRefGoogle Scholar
  9. 9.
    A. G. Popov, D. A. Kolodkin, V. S. Gaviko, et al., “High-energy-intensive (Nd, Dy) – (Fe, Co) – B magnets with reduced temperature coefficient of induction,” Fiz. Met. Metalloved., 118(10), 981 – 992 (2017).Google Scholar
  10. 10.
    B. Ma, K. S. V. L. Narasimhan, and J. C. Hurt, “Nd – Fe – B magnets with zero temperature coefficient of induction,” IEEE Trans. Magn., MAG-22, No. 5, 1081 – 1083 (1986).Google Scholar
  11. 11.
    E. N. Kablov, A. F. Petrakov, V. P. Piskorskii, et al., “Effect of dysprosium and cobalt on the temperature dependence of magnetization and phase composition of a material of the Nd – Fe – B system,” Metalloved. Term. Obrab. Met., No. 4, 3 – 10 (2007).Google Scholar
  12. 12.
    Z. H. Hu, F. Z. Lian, M. G. Zhu, and W. Li, “Effect of Co on the thermal stability and impact toughness of sintered Nd – Fe – B magnets,” J. Magn. Magn. Mater., 320, 2364 – 2367 (2008).CrossRefGoogle Scholar
  13. 13.
    E. N. Kablov, A. F. Petrakov, V. P. Piskorskii, et al., “Effect of praseodymium on magnetic properties and phase composition of a material of the Nd – Pr – Dy – Fe – Co – B system,” Metalloved. Term. Obrab. Met., No. 6, 12 – 16 (2005).Google Scholar
  14. 14.
    E. N. Kablov, V. P. Piskorskii, R. A. Valeev, et al., “Magnetic properties of sintered Pr – Dy – Fe – Co – B materials with high cobalt content,” Metally, No. 4, 58 – 60 (2014).Google Scholar
  15. 15.
    E. N. Kablov, V. P. Piskorskii, R. A. Valeev, et al., “Role of boron in formation of magnetic properties of sintered Nd – Dy – Fe – Co – B materials with high cobalt content,” Metally, No. 2, 35 – 36 (2014).Google Scholar
  16. 16.
    G. S. Burkhanov, E. M. Semenova, D. Yu. Karpenkov, et al., “Use of duplex sintering for improving the energy parameters of thermally stable Pr – Dy – Fe – Co – B – Cu – Al permanent magnets,” Perspekt. Mater., No. 11, 39 – 47 (2016).Google Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • A. G. Popov
    • 1
    • 2
  • D. A. Kolodkin
    • 1
  • V. S. Gaviko
    • 1
    • 2
  • D. Yu. Vasilenko
    • 3
  • A. V. Shitov
    • 3
  1. 1.M. N. Mikheev Institute of Metal PhisicsUral Branch of the Russian Academy of ScienciesEkaterinburgRussia
  2. 2.Institute of Natural Sciences and MathematicsUral Branch of the Russian Academy of ScienciesEkaterinburgRussia
  3. 3.Ural Electromechanical PlantEkaterinburgRussia

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