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No.2(pp.39-69)

Home > Issues > Volume 4 (1999) > No.2(pp.39-69)

The Effect of Additive Co on the Magnetic Properties of Fe₃B/Nd₂Fe₁₄B Magnets

Journal of Magnetics, Volume 4, Number 2, 30 Jun 1999, Pages 60-64

Choong-Jin Yang(Materials Lab., Research Institute of Industrial Science & Technology(RIST)), Eoun-Byung Park(Electromagnetic Materials Lab., Research Institute of Industrial Science & Technology(RIST)), Yong-Soon Hwang(Dept. of Physics, Youngnam National University), Eng-Chan Kim,(Dept. of Physics, Youngnam National University)

Abstract

The addition of Co into Nd₄Fe_77.5-xCo_x(HfGa)_yB_18.5(0≤x≤5, y=0, 0.5) was found to enhance the magnetic properties of Fe₃B/Nd₂Fe₁₄B nanocomposite magnets. The enhancement resulted from the fact that Co retarded the crystallization of α-Fe or Fe₃B but accelerated that of Nd₂Fe₁₄B. The decreased interval between the onset of crystallization temperature of Fe₃B and Nd₂Fe₁₄B phases enabled the grain growth of each phase to be uniform dufing a post annealing of the melt spun ribbons. The addition of 3~5 at.% Co into ternary composition Nd₄Fe_77.5B_18.5 increased the coercivity (_iH_c) from 3.27 to 3.54 kOe with the enhanced remanence value (4πM_r) around 11.54 kG. From the ribbon magnets of Nd₄Fe_71.5Co₅Hf_0.5B_18.5 made at 26 m/sec and annealed at 680℃ for 10 min, the magnetic properties of B_r=11.54 kG, _iH_c=3.54 kOe, and (BH)_max=14.35 MGOe were obtained from volume production line.

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