Ｎｄ‐Ｆｅ‐Ｂ系焼結磁石の強磁場熱処理と保磁力

DOI Web Site 参考文献16件
  • 加藤 宏朗
    山形大学大学院理工学研究科数物学分野 東北大学未来科学技術共同研究センター
  • 秋屋 貴博
    東北大学未来科学技術共同研究センター
  • 高橋 弘紀
    東北大学金属材料研究所

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  • High-Magnetic-Field Annealing and Coercivity in Sintered Nd-Fe-B Magnets

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  Results of a systematic study concerned with the high-magnetic-field effects on the coercivity in processing various series of sintered Nd-Fe-B magnets are given. Coercivity enhancement phenomenon was observed in several series of sintered Nd-Fe-B magnets with Cu additive after annealing under magnetic fields of 10~14 T. A strong correlation was suggested between the field annealing temperature at which maximum coercivity increase was observed and the anomaly temperature in differential scanning calorimetry experiments. We found a linear relation between the room temperature coercivity Hc of the sample annealed at Ta=500℃ under magnetic field Ha for a series of samples with different Dy contents, which can be expressed as Hc=Hc(0)+ α Ha, with Hc(0) being the value for the zero-field-annealed sample and α, the coercivity enhancement factor. Although very small, α has a positive finite value in samples with 0 mass% and 2 mass% Dy. Significant increase in α value was confirmed for samples with Dy content larger than 6 mass%. This suggests the effects of higher anisotropy in paramagnetic susceptibility of Nd-rich intergranular phase containing Dy. Also introduced is the preliminary results of the grain boundary diffusion process of sinterd Nd-Fe-B samples with surface Dy layer under strong gradient magnetic fields produced by the 18 T superconducting magnets.<br>

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