公开(公告)号：US20140242267A1

公开(公告)日：2014-08-28

申请号：US14237702

申请日：2012-11-12

Applicant: TYTOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Tetsuya Shoji ,  Akira Manabe ,  Noritaka Miyamoto ,  Motoki Hiraoka ,  Shinya Omura ,  Daisuke Ichigozaki ,  Shinya Nagashima

IPC: H01F1/055 ,  H01F41/02

CPC classification number: H01F1/055 ,  B22F3/10 ,  B22F3/162 ,  B22F3/26 ,  B22F2998/10 ,  C22C28/00 ,  C22F1/16 ,  H01F1/0577 ,  H01F41/0253 ,  H01F41/0293 ,  B22F2009/048 ,  B22F3/14

Abstract: Provided is a rare-earth magnet containing no heavy rare-earth metals such as Dy or Tb in a grain boundary phase, has a modifying alloy for increasing coercivity (in particular, coercivity under a high-temperature atmosphere) infiltrated thereinto at lower temperature than in the conventional rare-earth magnets, has high coercivity, and has relatively high magnetizability, and a production method therefor. The rare-earth magnet RM includes a RE-Fe—B-based main phase MP with a nanocrystalline structure (where RE is at least one of Nd or Pr) and a grain boundary phase BP around the main phase, the grain boundary phase containing a RE-X alloy (where X is a metallic element other than heavy rare-earth elements). Crystal grains of the main phase MP are oriented along the anisotropy axis, and each crystal grain of the main phase, when viewed from a direction perpendicular to the anisotropy axis, has a plane that is quadrilateral in shape or has a close shape thereto.

Abstract translation: 本发明提供一种在晶界相中不含重金属如Dy或Tb的稀土类磁体，具有在较低温度下渗透的矫顽力（特别是高温环境下的矫顽力）的改性合金， 在现有的稀土类磁铁中，具有高的矫顽力，并且具有较高的可磁化性及其制造方法。 稀土磁体RM包括具有纳米晶体结构的RE-Fe-B基主相MP（其中RE是Nd或Pr中的至少一个）和主相周围的晶界相BP，晶界相包含 RE-X合金（其中X是重稀土元素以外的金属元素）。 主相MP的晶粒沿着各向异性轴取向，当从与各向异性轴垂直的方向观察时，主相的各晶粒具有四边形或与其形状近似的面。