4.7 Article

Enhanced coercivity in SmCo5 magnet subjected to hydrogen treatment

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 866, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158272

Keywords

Sm-Co alloys; Microstructure; Hydrogen treatment; Grain refinement; Coercivity; Texture

Funding

  1. National Science Centre of Poland [2018/31/B/ST7/04006]

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The relationship between phase recombination conditions and the phase content, microstructure, and magnetic properties of sintered SmCo5-based permanent magnets was investigated. It was found that by adjusting the temperature and holding time during recombination, the magnetic properties of the magnets could be improved.
The relations between the phase recombination conditions and phase content, microstructure, and magnetic properties of sintered SmCo5-based permanent magnets, subjected to hydrogen treatment, were studied by X-ray diffraction, scanning electron microscopy, and magnetic hysteresis loop measurements. Recombination of the disproportionation products, SmH2 +/- x, Co, and remains of SmCo5 phase, was carried out by heating the alloy in a vacuum to 850 degrees C with and without holding it for 1 h, and by heating it to 950 degrees C. It was shown that after recombination, the coercivity of the magnet, H-mu 0(c), reached the value of 4.90-4.97 T. The remnant magnetization increased from 27.7 to 43.5, and to 46.7 Am-2/kg with increasing holding time during recombination from 0 to 1 h at a temperature of 850 degrees C, and with increased recombination temperature to 950 degrees C. The hysteresis loop rectangularity changed from 77 to 74.6, and to 78.8% under the same conditions. (C) 2020 Elsevier B.V. All rights reserved.

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