熱間加工バルクネオジム磁石へのRE-Cu共晶合金の低温拡散プロセス

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2016/08/01

タイトル(英語): Low-temperature Diffusion Process for Hot-deformed Bulk Permanent Magnet using RE-Cu Eutectic Alloy

著者名: 秋屋　貴博（大同特殊鋼（株）），日置　敬子（大同特殊鋼（株）），服部　篤（大同特殊鋼（株）），H. Sepehri-Amin（物質・材料研究機構 元素戦略磁性材料研究拠点），大久保　忠勝（物質・材料研究機構 元素戦略磁性材料研究拠点），宝野　和博（物質・材料研究機構 元素戦略磁性材料研究拠点）

著者名(英語): Takahiro Akiya (Daido Steel Co., Ltd.), Keiko Hioki (Daido Steel Co., Ltd.), Atsushi Hattori (Daido Steel Co., Ltd.), H. Sepehri-Amin (Element Strategy Initiative Center for Magnetic Materials, National Institute of Materials Science), Tadakatsu Ohkubo (Element Strategy Initiative Center for Magnetic Materials, National Institute of Materials Science), Kazuhiro Hono (Element Strategy Initiative Center for Magnetic Materials, National Institute of Materials Science)

キーワード: 熱間加工ネオジム磁石，低温拡散プロセス，膨張拘束拡散法，保磁力　　hot deformed Nd-Fe-B magnet，low-temperature diffusion process，expansion constraint technique，coercivity

要約(英語): This paper reviews recent progresses in coercivity improvement of hot-deformed anisotropic Nd-Fe-B magnets by the low temperature grain boundary diffusion process using RE70Cu30 (RE = Pr, Nd) eutectic alloys. Using Pr70Cu30 alloy, the coercivity was enhanced from 1.60 T to 2.56 T. The hot-deformed samples are expanded along only c-axis direction after the diffusion process by the formation of thick Nd-rich grain boundary phase parallel to the c-planes of platelet shaped Nd2Fe14B grains. To suppress the reduction in remanence caused by the excess expansion during the diffusion process, we developed an expansion constraint eutectic diffusion process. We demonstrated high performance Dy-free anisotropy magnet with coercivity, µ0Hc = 1.94 T, and remanence, Br = 1.35 T, by the expansion constraint diffusion process using a Nd-Cu alloy as a diffusion source.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.136 No.8 （2016） 特集：高性能永久磁石の最先端研究とその応用動向

本誌掲載ページ: 478-483 p

原稿種別: 解説論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/136/8/136_478/_article/-char/ja/