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<p>Regenerated sintered Nd-Fe-B magnets were produced. This was achieved by mixing Nd-Fe-B solid waste with Tb<sub>4</sub>O<sub>7</sub> for grain boundary addition. The preparation parameters were established during this process. Experimental results showed that adding Tb<sub>4</sub>O<sub>7</sub> significantly improved the coercivity of the regenerated sintered Nd-Fe-B magnets. The melting point of Tb<sub>4</sub>O<sub>7</sub> ranges from 2200 to 2410&#xa0;°C. The amounts of Tb<sub>4</sub>O<sub>7</sub> added varied: 0 wt.%, 0.2 wt.%, 0.4 wt.%, and 0.6 wt.%. Additionally, the study evaluated how Tb<sub>4</sub>O<sub>7</sub> addition affected the corrosion resistance of the magnets. The solid waste and auxiliary alloys were processed separately first. They were then mixed according to their mass percentages for powder blending. Following this, a high-temperature sintering aging treatment was performed to obtain the regenerated magnets. Tb<sub>4</sub>O<sub>7</sub> exhibited a core/shell morphology alongside the primary phase. Its high melting point suppressed the growth of main phase grains at the grain boundaries. This helped refine the grains. Furthermore, the presence of Tb at the grain boundaries reduced the corrosion driving force between the main phase and the grain boundary phase. The addition of trace amounts of Tb oxide significantly improved the magnetic properties of the regenerated magnets. The corrosion potential of the magnets increased with the incorporation of Tb<sub>4</sub>O<sub>7</sub>. It rose from − 1.181&#xa0;V for the original magnets to − 1.015&#xa0;V. This marks a total rise of 14%, notably enhancing the corrosion resistance of the magnets.</p>

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Influence of Tb4O7 Doping on the Magnetic Characteristics and Corrosion Resistance of Sintered Nd-Fe-B Magnets

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • Shasha Jiang,
  • Kai Wang,
  • Xiaochang Yu,
  • Yongtao Dai,
  • Qingrong Yao,
  • Like Tao,
  • Fangyu Gan,
  • Dongxu Liu,
  • Zhao Lu,
  • Jianqiu Deng

摘要

Regenerated sintered Nd-Fe-B magnets were produced. This was achieved by mixing Nd-Fe-B solid waste with Tb4O7 for grain boundary addition. The preparation parameters were established during this process. Experimental results showed that adding Tb4O7 significantly improved the coercivity of the regenerated sintered Nd-Fe-B magnets. The melting point of Tb4O7 ranges from 2200 to 2410 °C. The amounts of Tb4O7 added varied: 0 wt.%, 0.2 wt.%, 0.4 wt.%, and 0.6 wt.%. Additionally, the study evaluated how Tb4O7 addition affected the corrosion resistance of the magnets. The solid waste and auxiliary alloys were processed separately first. They were then mixed according to their mass percentages for powder blending. Following this, a high-temperature sintering aging treatment was performed to obtain the regenerated magnets. Tb4O7 exhibited a core/shell morphology alongside the primary phase. Its high melting point suppressed the growth of main phase grains at the grain boundaries. This helped refine the grains. Furthermore, the presence of Tb at the grain boundaries reduced the corrosion driving force between the main phase and the grain boundary phase. The addition of trace amounts of Tb oxide significantly improved the magnetic properties of the regenerated magnets. The corrosion potential of the magnets increased with the incorporation of Tb4O7. It rose from − 1.181 V for the original magnets to − 1.015 V. This marks a total rise of 14%, notably enhancing the corrosion resistance of the magnets.