Effects of Zr and C Additions on Magnetic Properties and Microstructures of α-Fe/Nd2F14B Nanocomposite Magnets

H. Takehara; H. Ino; T. Ohkubo; K. Hono

doi:10.2320/matertrans.47.2399

Effects of Zr and C Additions on Magnetic Properties and Microstructures of α-Fe/Nd₂F₁₄B Nanocomposite Magnets

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Keywords: hard magnet, Nd₂Fe₁₄B, Nd₂Fe₁₇C_x, melt-spinning, heat treatment, nanocomposite, transmission electron microscope, energy filter, Nd₈Fe₈₅B₆C₁ alloy

JOURNAL FREE ACCESS

2006 Volume 47 Issue 9 Pages 2399-2404

DOI https://doi.org/10.2320/matertrans.47.2399

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Abstract

The effects of Zr and C additions on the magnetic properties and microstructures of melt-spun Nd₈Fe_85−xZr_xB_7−yC_y (x=0–3,y=0,1) alloy ribbons were investigated. The cooling rates of melts and the heat treatment conditions were varied to optimize the hard magnetic properties. The C addition improved remanence and the Zr addition suppressed the undesirable crystallization of Nd₂Fe₁₇C_x during heat treatment. The (BH)_max of 135 kJ/m³ was obtained for an optimally heat-treated Nd₈Fe₈₃Zr₂B₆C₁ ribbon.

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