Structure and Magnetic Properties of Nd–Fe–B Magnets Prepared from DyH2-Containing Powder Mixtures
- Авторлар: Burkhanov G.1, Kolchugina N.1, Lukin A.2, Koshkidko Y.3, Cwik J.3, Skotnicova K.4, Sitnov V.2
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Мекемелер:
- Baikov Institute of Metallurgy and Materials Science
- JSC Spetsmagnit
- International Laboratory of High Magnetic Fields and Low Temperatures
- Vysoka Skola Banska—TUO
- Шығарылым: Том 9, № 3 (2018)
- Беттер: 509-516
- Бөлім: Composite Materials
- URL: https://journals.rcsi.science/2075-1133/article/view/207473
- DOI: https://doi.org/10.1134/S2075113318030115
- ID: 207473
Дәйексөз келтіру
Аннотация
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.
Авторлар туралы
G. Burkhanov
Baikov Institute of Metallurgy and Materials Science
Хат алмасуға жауапты Автор.
Email: genburkh@imet.ac.ru
Ресей, Moscow, 119334
N. Kolchugina
Baikov Institute of Metallurgy and Materials Science
Email: genburkh@imet.ac.ru
Ресей, Moscow, 119334
A. Lukin
JSC Spetsmagnit
Email: genburkh@imet.ac.ru
Ресей, Moscow, 127238
Yu. Koshkidko
International Laboratory of High Magnetic Fields and Low Temperatures
Email: genburkh@imet.ac.ru
Польша, Wroclaw, 53-421
J. Cwik
International Laboratory of High Magnetic Fields and Low Temperatures
Email: genburkh@imet.ac.ru
Польша, Wroclaw, 53-421
K. Skotnicova
Vysoka Skola Banska—TUO
Email: genburkh@imet.ac.ru
Чехия, Ostrava-Poruba, 70833
V. Sitnov
JSC Spetsmagnit
Email: genburkh@imet.ac.ru
Ресей, Moscow, 127238