公开(公告)号：US09607741B2

公开(公告)日：2017-03-28

申请号：US14256218

申请日：2014-04-18

Applicant: TODA KOGYO CORPORATION

Inventor： Yasuhiko Fujii ,  Minoru Ohsugi ,  Yasushi Nishio ,  Yosuke Koyama ,  Shigeru Takaragi

IPC: H01F1/08 ,  H01F1/113 ,  C01G49/00 ,  H01F1/01 ,  C09C1/22 ,  H01F1/42 ,  H01F41/02

CPC classification number: H01F1/01 ,  C01G49/0036 ,  C01P2002/52 ,  C01P2006/10 ,  C01P2006/12 ,  C01P2006/42 ,  C09C1/22 ,  H01F1/113 ,  H01F1/42 ,  H01F41/0273 ,  Y10T428/2982

Abstract: The present invention relates to ferrite particles for bonded magnet, having a volume-average particle diameter of 2.1 to 2.7 μm and a particle diameter ×90 of 4.3 to 5.4 μm wherein the ×90 represents a particle diameter at which a cumulative percentage of particles under sieve (undersize particles) based on a volume thereof is 90%, when determined from a particle size distribution thereof measured by using a laser diffraction type particle size distribution measuring apparatus.