自己組織化ラジアル磁気異方性希土類ボンド磁石の作製とその特性

概要

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The magnetic properties of radially anisotropic ringshaped magnets deteriorate when their diameter is decreased, with the result that miniaturization of motors containing such magnets becomes difficult. To overcome this difficulty, we developed a selforganization technique for rare-earth bonded magnets. By using this technique, we controlled the flexibility of perpendicular-anisotropic rigid sheet-shaped bonded magnets (approximately 1mm in thickness), transformed them into various shapes, and succeeded in preparing radially anisotropic ring- and arc-shaped magnets. Though optimization of the material composition and the processes, the obtained energy-product, (BH)_<max>, exceeded 160kJ/m^3 even when the magnets' diameter was decreased. Furthermore, HDDR-Nd_2Fe_<14>B particles were isolated by RD-Sm_2Fe_<17>N_3 fine particles, and compaction at low pressure suppressed destruction of and cracks in HDDR-Nd_2Fe_<14>B particles, which improved the initial flux loss at elevated temperatures. Consequently, the magnets can be reduced in size to enable further miniaturization of highperformance small motors.
2005-03-01