Title: The Effect of Additive Co on the Magnetic Properties of Fe₃B / Nd₂Fe₁₄B Magnets
Abstract: The addition of Co into Nd₄Fe_(77.5-x)Co_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 during a post annealing of the melt spun ribbons. The addition of 3~5 at.% Co into ternary composition Nd₄Fe_(77.5)B_(18.5) increased the coercivity (iHc) from 3.27 to 3.54 kOe with the enhanced remanence value (4πMr) around 11.54 kG. From the ribbon magnets of Nd₄Fe_(71.5)Co_5Hf_(0.5)Ga_(0.5)B_(18.5) made at 26 m/sec and annealed at 680℃ for 10 min, the magnetic properties of Br=11.54 kG, iHc=3.54 kOe, and (BH)max=14.35 MGOe were obtained from volume production line.
Publication Year: 1999
Publication Date: 1999-06-01
Language: en
Type: article
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