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

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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.

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References

  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).

    Article  CAS  Google Scholar 

  2. Y. Matsuura, “Recent development of Nd – Fe – B sintered magnets and their applications,” J. Magn. Magn. Mater., 303, 344 – 347 (2006).

    Article  CAS  Google Scholar 

  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).

    Article  CAS  Google Scholar 

  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).

    Article  CAS  Google Scholar 

  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).

    Article  Google Scholar 

  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).

    Article  CAS  Google Scholar 

  7. M. Sagawa, S. Hirosawa, H. Yamamoto, et al., “Nd – Fe – B permanent magnet materials,” Jap. J. Appl. Phys., 26(6), 785 – 800 (1987).

    Article  CAS  Google Scholar 

  8. J. F. Herbst, “R2Fe14B materials: Intrinsic properties and technological aspects,” Rev. Mod. Phys., 63(4), 819 – 898 (1991).

    Article  CAS  Google Scholar 

  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. 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).

  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).

  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).

    Article  CAS  Google Scholar 

  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).

  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).

  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).

  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).

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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).

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Authors and Affiliations

  1. M. N. Mikheev Institute of Metal Phisics, Ural Branch of the Russian Academy of Sciencies, Ekaterinburg, Russia

    A. G. Popov, D. A. Kolodkin & V. S. Gaviko

  2. Institute of Natural Sciences and Mathematics, Ural Branch of the Russian Academy of Sciencies, Ekaterinburg, Russia

    A. G. Popov & V. S. Gaviko

  3. Ural Electromechanical Plant, Ekaterinburg, Russia

    D. Yu. Vasilenko & A. V. Shitov

Authors
  1. A. G. Popov
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  2. D. A. Kolodkin
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  3. V. S. Gaviko
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  4. D. Yu. Vasilenko
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  5. A. V. Shitov
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Correspondence to D. A. Kolodkin.

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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 42 – 47, August, 2018.

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Popov, A.G., Kolodkin, D.A., Gaviko, V.S. et al. Structure and Properties of R – (Fe, Co) – B (R = Nd, Dy, Ho) Permanent Magnets with Low Temperature Coefficient of Induction. Met Sci Heat Treat 60, 528–533 (2018). https://doi.org/10.1007/s11041-018-0313-3

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  • DOI: https://doi.org/10.1007/s11041-018-0313-3

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