Fabrication of Anisotropic Nd–Fe–B Powders by Ta Sputtering

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  • Kimura Moe
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Matsuura Masashi
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Tezuka Nobuki
    Department of Materials Science, Graduate School of Engineering, Tohoku University
  • Sugimoto Satoshi
    Department of Materials Science, Graduate School of Engineering, Tohoku University

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Description

<p>The influence of Ta sputtering on the fabrication of anisotropic Nd–Fe–B powders was investigated. X-ray fluorescence and secondary electron microscopy analysis revealed that the measured Ta content after sputtering was 5.6 mass% and the Ta particles were located on the surfaces of the Nd–Fe–B grains. Ta coating on Nd–Fe–B grain could prevent necking between Nd–Fe–B grains after annealing at 700°C for Nd–Fe–B powders with and without Ta sputtering, and the Ta-sputtered powder could be easily crushed.</p><p>After crushing and sieving under 75 µm, the coercivity value of the powders with and without Ta sputtering were almost the same, while the anisotropy of Ta-sputtered powder was higher. Upon annealing and crushing, the degree of texture (λ), which is used to evaluate anisotropy, improved from 0.08 to 0.73 for the Ta-sputtered Nd–Fe–B powder and was higher than that for the non-Ta-sputtered Nd–Fe–B powder. The results demonstrate that Ta sputtering can be an effective technique for the fabrication of anisotropic Nd–Fe–B powders.</p>

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 60 (5), 830-836, 2019-05-01

    The Japan Institute of Metals and Materials

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