Structure and Magnetic Properties of Nd–Fe–B Magnets Prepared from DyH2-Containing Powder Mixtures
- Authors: Burkhanov G.S.1, Kolchugina N.B.1, Lukin A.A.2, Koshkidko Y.S.3, Cwik J.3, Skotnicova K.4, Sitnov V.V.2
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Affiliations:
- Baikov Institute of Metallurgy and Materials Science
- JSC Spetsmagnit
- International Laboratory of High Magnetic Fields and Low Temperatures
- Vysoka Skola Banska—TUO
- Issue: Vol 9, No 3 (2018)
- Pages: 509-516
- Section: Composite Materials
- URL: https://journals.rcsi.science/2075-1133/article/view/207473
- DOI: https://doi.org/10.1134/S2075113318030115
- ID: 207473
Cite item
Abstract
Sintered Nd–Pr–Dy–Fe–B permanent magnets were prepared by a powder blending technique using mixtures consisting of strip-casting alloy (wt %) 24.0 Nd, 6.5 Pr, 0.5 Dy, 1.0 B, 0.2 Al, 65.8 Fe and 2 wt % DyH2 dysprosium hydride. After optimum heat treatment of magnets at 500°C for 1 h, the following hysteretic characteristics were reached: remanence Br = 1.29 T; coercive force jHc = 1309 kA/m; critical field Hk = 1220 kA/m; and the maximum energy product (BH)max = 322 kJ/m3. The characteristic peculiarity of the magnets prepared from hydride-containing power mixtures is the stability of hysteretic properties in the course of subsequent stepped annealings or progressive heatings at temperatures of 250–500°C for, in total, more than 20 h. Conditions of low-temperature annealings resulting in the degradation and subsequent restoration of hysteretic properties of magnets are determined. The evolution of the microstructure and phase composition of magnets in the course of heat treatments was studied by X-ray diffraction analysis and scanning electron microscopy, and the correlation between the structural changes and hysteretic properties of magnets is discussed.
About the authors
G. S. Burkhanov
Baikov Institute of Metallurgy and Materials Science
Author for correspondence.
Email: genburkh@imet.ac.ru
Russian Federation, Moscow, 119334
N. B. Kolchugina
Baikov Institute of Metallurgy and Materials Science
Email: genburkh@imet.ac.ru
Russian Federation, Moscow, 119334
A. A. Lukin
JSC Spetsmagnit
Email: genburkh@imet.ac.ru
Russian Federation, Moscow, 127238
Yu. S. Koshkidko
International Laboratory of High Magnetic Fields and Low Temperatures
Email: genburkh@imet.ac.ru
Poland, Wroclaw, 53-421
J. Cwik
International Laboratory of High Magnetic Fields and Low Temperatures
Email: genburkh@imet.ac.ru
Poland, Wroclaw, 53-421
K. Skotnicova
Vysoka Skola Banska—TUO
Email: genburkh@imet.ac.ru
Czech Republic, Ostrava-Poruba, 70833
V. V. Sitnov
JSC Spetsmagnit
Email: genburkh@imet.ac.ru
Russian Federation, Moscow, 127238