Search
Home > Issues > SearchImprovement of Magnetic Properties of SmCo5/α-Fe Nanocomposite Magnets by Magnetic Field Annealing
Journal of Magnetics, Volume 23, Number 3, 30 Sep 2018, Pages 381-385
Y. Wei (College of Materials Science and Engineering, Beijing University of Technology), Y. Q. Li (College of Materials Science and Engineering, Beijing University of Technology), D. T. Zhang (College of Materials Science and Engineering, Beijing University of Technology), M. Yue * 
(College of Materials Science and Engineering, Beijing University of Technology)
(College of Materials Science and Engineering, Beijing University of Technology)
Abstract
In this paper, magnetic field heat treatment was carried out for the SmCo5/α-Fe amorphous powders prepared by high-energy ball milling. The effects of annealing temperature and magnetic field on the crystallization,
microstructure, and magnetic properties of the SmCo5/α-Fe nanocomposite permanent magnets were studied. The results show that the magnetic field can benefit the crystallization of SmCo5 phase and the degree of crystallinity of SmCo5/α-Fe alloy. Thus, the remanence and coercivity of the SmCo5/α-Fe magnets annealed with magnetic field are significant higher than those of the samples annealed without magnetic field. With the
increase of annealing temperature in magnetic field heat treatment, the Sm(Co, Fe)5 phase and FeCo phase are gradually crystallized and grew up, while a small amount of Sm2Co17 phase appears. The best magnetic properties are Mr = 73.29 emu/g, Mr/Ms = 0.59, and Hci = 6.20 kOe, when the annealing temperature is 700 oC.
microstructure, and magnetic properties of the SmCo5/α-Fe nanocomposite permanent magnets were studied. The results show that the magnetic field can benefit the crystallization of SmCo5 phase and the degree of crystallinity of SmCo5/α-Fe alloy. Thus, the remanence and coercivity of the SmCo5/α-Fe magnets annealed with magnetic field are significant higher than those of the samples annealed without magnetic field. With the
increase of annealing temperature in magnetic field heat treatment, the Sm(Co, Fe)5 phase and FeCo phase are gradually crystallized and grew up, while a small amount of Sm2Co17 phase appears. The best magnetic properties are Mr = 73.29 emu/g, Mr/Ms = 0.59, and Hci = 6.20 kOe, when the annealing temperature is 700 oC.
Keywords: magnetic field heat treatment; SmCo5/α-Fe nanocomposite magnet; crystallization
DOI: https://doi.org/10.4283/JMAG.2018.23.3.381
Full Text : PDF
