Microstructure and Magnetic Properties of Submicron-grained Nd-Fe-B Anisotropic Bulk Permanent Magnets Prepared from Compressed Aligned Fine Powder via Hydrogenation-Disproportionation-Desorption-Recombination

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  • Nozawa Noriyuki
    Magnetic Materials Research Laboratory, NEOMAX Company, Hitachi Metals, Ltd.
  • Nishiuchi Takeshi
    Magnetic Materials Research Laboratory, NEOMAX Company, Hitachi Metals, Ltd.
  • Hirosawa Satoshi
    Magnetic Materials Research Laboratory, NEOMAX Company, Hitachi Metals, Ltd.

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  • 異方性微粉末成形体のＨＤＤＲ処理により作製したサブミクロン結晶Ｎｄ－Ｆｅ－Ｂ系異方性バルク磁石の組織と磁気特性
  • イホウセイ ビフンマツ セイケイタイ ノ HDDR ショリ ニ ヨリ サクセイ シタ サブミクロン ケッショウ Nd Fe Bケイ イホウセイ バルク ジシャク ノ ソシキ ト ジキ トクセイ

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Abstract

We applied Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) treatment on compacts of fine powder of Nd-Fe-B-based alloys to obtain porous, submicron-grained bulk permanent magnets. The crystallographic orientation of the Nd2Fe14B particles was maintained in the porous magnets, which could be further densified to the full density by hot pressing. Significant improvements over conventional HDDR-processed magnets were observed in the squareness of demagnetization curves for the full-density bulk magnets.

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