公开(公告)号：US20190228888A1

公开(公告)日：2019-07-25

申请号：US16336063

申请日：2017-09-25

Applicant: NITTO DENKO CORPORATION

Inventor： Kenichi FUJIKAWA ,  Izumi OZEKI ,  Takashi YAMAMOTO ,  Hirofumi EBE ,  Takuya NOBUTA

IPC: H01F1/057 ,  H01F41/02 ,  B22F1/02 ,  B22F3/14 ,  B22F3/02

Abstract: A method comprises: charging a rare-earth magnet-forming material comprising magnet material particles into a mold, in a state in which an easy magnetization axis of each of the magnet material particles is oriented in one plane; sintering the rare-earth magnet-forming material charged in the mold by heating the rare-earth magnet-forming material to a sintering temperature while applying a given magnitude of pressing force to the rare-earth magnet-forming material, to thereby form a sintered body in which the magnet material particles are integrally sintered; and then subjecting the sintered body to high-temperature heat treatment, under a pressure lower than the pressing force during the sintering and under a maximum achieving temperature which ranges from greater than 900° C. to 1100° C., and whose difference from a maximum achieving temperature during the pressure sintering is within 250° C.