公开(公告)号：US20190115125A1

公开(公告)日：2019-04-18

申请号：US16159764

申请日：2018-10-15

Applicant: TDK Corporation

Inventor： Taeko TSUBOKURA ,  Takeshi MASUDA ,  Toshihiro KUROSHIMA

IPC: H01F1/057 ,  C22C28/00

Abstract: The present invention provides a magnet structure comprising a first magnet, a second magnet, and an intermediate layer joining the first magnet and the second magnet. In the magnet structure, each of the first magnet and the second magnet is a permanent magnet comprising a rare earth element R, a transition metal element T, and boron B. In addition, the rare earth element R comprises: a light rare earth element RL comprising at least Nd; and a heavy rare earth element RH, and the transition metal element T comprises Fe, Co, and Cu. Further, the intermediate layer comprises: an RL oxide phase comprising an oxide of the light rare earth element RL; and an RL—Co—Cu phase comprising the light rare element RL, Co, and Cu.

公开(公告)号：US20140290803A1

公开(公告)日：2014-10-02

申请号：US14228808

申请日：2014-03-28

Applicant: TDK CORPORATION

Inventor： Eiji KATO ,  Yoshinori FUJIKAWA ,  Taeko TSUBOKURA ,  Chikara ISHIZAKA ,  Katsuo SATO

IPC: H01F1/153 ,  H01F1/053

CPC classification number: H01F1/0577 ,  H01F41/0273

Abstract: The present invention provides a rare earth based magnet including R2T14B main-phase crystal grains, and two-grain boundary phases between adjacent two R2T14B main-phase crystal grains, the two-grain boundary phases are controlled such that the thickness thereof is 5 nm or more and 500 nm or less, and it is composed of a phase with a magnetism different from that of a ferromagnet.

Abstract translation: 本发明提供一种包含R2T14B主相晶粒和相邻的两个R2T14B主相晶粒之间的双晶界相的稀土类磁体，控制两晶界相的厚度为5nm， 多于500nm或更小，并且由具有与铁磁体不同的磁性的相组成。