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High coercivity Pr2Fe14B/α-Fe nanocomposite permanent magnets with Zr addition

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Abstract

The ingots with nominal composition \({ \Pr }_{9.5} {\text{Fe}}_{84 - x} {\text{B}}_{6.4} {\text{P}}_{0.1} {\text{Zr}}_{x}\) (x = 0, 1, 2, 3) were prepared by an electric arc furnace under purified argon atmosphere. The ribbons were obtained by melt spinning at a wheel speed of 16–33 m·s−1. X-ray diffraction (XRD) results show that P addition decreases crystallinity of hard phase, but further Zr addition increases the amorphous-forming ability of soft phase. The intrinsic coercivity largely increases from 502 (Zr-free) to 945 kA·m−1 (2 at% Zr), which is among the highest value reported so far in this poor rare earth nanocomposite magnets. The hysteresis loops of the alloys with addition of 1 at% and 2 at% Zr show good squareness with single-phase characteristic, indicating well exchange coupling between hard and soft magnetic grains. Transmission electron microscope (TEM) results reveal small grain size and uniformity in the microstructure in the Zr-added samples, which is the reason for high coercivity.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 11474184 and 11627805) and Shandong Province Natural Science Foundation of China (No. ZR2016EMM14). We thank Song and Zhang from ZKKF (Beijing), and Cui from National Demonstration Physics Education (Shandong University) for the help of TEM and XRD support, respectively.

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Correspondence to Guang-Bing Han.

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Alam, M.K., Han, G. & Kang, S. High coercivity Pr2Fe14B/α-Fe nanocomposite permanent magnets with Zr addition. Rare Met. 39, 41–47 (2020) doi:10.1007/s12598-019-01258-7

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Keywords

  • Magnetic properties
  • Coercivity
  • Zr addition
  • Nanocomposite magnets