公开(公告)号：EP3511960A1

公开(公告)日：2019-07-17

申请号：EP18780459.6

申请日：2018-01-29

申请人： Kabushiki Kaisha Toyota Chuo Kenkyusho ,  Denso Corporation

发明人： UTSUNO Seishi ,  HWANG Jung hwan ,  MATSUBARA Ken

IPC分类号： H01F1/33 ,  B22F1/00 ,  B22F1/02 ,  B22F3/00 ,  B22F3/24 ,  H01F1/34 ,  H01F27/255 ,  H01F41/02

摘要： A low-loss dust core is provided with which both the high specific resistance and the low coercivity can be achieved. The dust core of the present invention comprises: soft magnetic particles comprising pure iron or an iron alloy; and a grain boundary layer present between adjacent soft magnetic particles. The grain boundary layer has a main phase and a barrier phase. The main phase comprises a spinel-type ferrite (M x Fe 3-x O 4 , 0 2 O 4 and a second ferrite such as MnFe 2 O 4 coexist. The barrier phase blocks the Fe diffusion from the soft magnetic particles and suppresses the deterioration of the main phase comprising the second ferrite responsible for the insulating property.