公开(公告)号：US20180221951A1

公开(公告)日：2018-08-09

申请号：US15749129

申请日：2016-07-29

Applicant: NITTO DENKO CORPORATION

Inventor： Kenichi FUJIKAWA ,  Izumi OZEKI ,  Tomohiro OMURE ,  Miho YAMAGUCHI ,  Toshiaki OKUNO ,  Hiroshi MATSUO

IPC: B22F3/10 ,  C22C38/00 ,  H01F1/055 ,  H01F1/08 ,  H01F7/02

CPC classification number: B22F3/1017 ,  B22F1/0011 ,  B22F1/0059 ,  B22F1/0062 ,  B22F3/10 ,  B22F3/1021 ,  B22F3/164 ,  B22F5/00 ,  B22F2003/026 ,  B22F2009/043 ,  B22F2009/044 ,  B22F2009/048 ,  B22F2202/05 ,  B22F2207/11 ,  B22F2998/10 ,  B22F2999/00 ,  C22C38/00 ,  C22C2202/02 ,  H01F1/055 ,  H01F1/0571 ,  H01F1/08 ,  H01F1/083 ,  H01F1/086 ,  H01F7/02 ,  H01F41/0266 ,  H01F41/0273 ,  B22F3/02 ,  B22F2003/248

Abstract: Provided is a heretofore non-existing, novel rare-earth sintered magnet having both of an extremely low carbon content and an extremely small average particle size of magnet material particles. The sintered body for forming a rare-earth magnet comprises a large number of magnet material particles sintered together, wherein each of the magnet material particles contains a rare-earth substance and has an easy magnetization axis. This sintered body for forming a rare-earth magnet has a carbon content of 500 ppm or less, and the magnet material particles have an average particle size of 2 μm or less.

公开(公告)号：US20180130581A1

公开(公告)日：2018-05-10

申请号：US15559652

申请日：2016-03-24

Applicant: NITTO DENKO CORPORATION

Inventor： Kenichi FUJIKAWA ,  Katsuya KUME ,  Kazuo OUCHI ,  Toshinobu HOSHINO ,  Masakazu MORIMOTO ,  Hirofumi ONO ,  Katsuyuki NAKABAYASHI ,  Miho YAMAGUCHI ,  Hiroshi MATSUO ,  Toshiaki OKUNO ,  Makoto FUJIHARA ,  Eiichi IMOTO ,  Hirofumi EBE ,  Tomohiro OMURE ,  Izumi OZEKI ,  Takashi YAMAMOTO ,  Yuki KATO ,  Tomoya MATSUDA ,  Shoichiro SAITO

IPC: H01F1/08 ,  H01F41/02 ,  H01F1/057 ,  H02K1/27 ,  H01F7/02

CPC classification number: H01F1/086 ,  H01F1/057 ,  H01F1/0577 ,  H01F7/02 ,  H01F41/0273 ,  H01F41/028 ,  H01F41/0293 ,  H02K1/27

Abstract: Provided is a method for producing a sintered body that forms a rare-earth permanent magnet, has a single sintered structure and an arbitrary shape, and has easy magnetization axis orientations of different directions applied to the magnet material particles in a plurality of arbitrary regions. This method forms a three-dimensional first molded article from a composite material formed by mixing a resin material and magnet material particles containing a rare-earth substance. The first molded article is then subjected to a deforming force and a second molded article is formed in which the orientation direction of the easy magnetization axis of the magnet material particles in at least the one section of the horizontal cross-section is changed to a direction which differs from the orientation direction of the first molded article. The second molded article is heated to a sintering temperature and kept at the temperature for a period of time.