公开(公告)号：US11232901B2

公开(公告)日：2022-01-25

申请号：US15738710

申请日：2016-07-01

申请人： TOHOKU MAGNET INSTITUTE CO., LTD. ,  PANASONIC CORPORATION

发明人： Akihiro Makino ,  Nobuyuki Nishiyama ,  Kana Takenaka ,  Yukio Nishikawa ,  Terutsugu Segawa

IPC分类号： H01F41/02 ,  C21D6/00 ,  C21D9/52 ,  C21D1/26 ,  H01F27/25 ,  H01F3/04 ,  H01F1/153 ,  C22C45/02 ,  H01F1/147 ,  H01F27/245

摘要： A method for producing a magnetic core includes a processing step of giving a desired shape to a strip made of an alloy composition, a heat-treating step of forming bcc-Fe crystals, and then a stacking step of obtaining a magnetic core having a shape. Here, the alloy composition is Fe—B—Si—P—Cu—C and has an amorphous phase as a primary phase. In the heat-treating step, the strip is heated up to a temperature higher than a crystallization temperature of the alloy composition at a high heating rate.

公开(公告)号：US10388444B2

公开(公告)日：2019-08-20

申请号：US15327143

申请日：2015-07-17

申请人： TOHOKU MAGNET INSTITUTE CO., LTD.

发明人： Akihiro Makino ,  Nobuyuki Nishiyama ,  Parmanand Sharma ,  Kana Takenaka

IPC分类号： C22C33/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/10 ,  C22C38/16 ,  C22C45/02 ,  B22F1/00 ,  H01F1/147 ,  H01F1/20 ,  H01F1/153

摘要： Alloy powder of a composition formula Fe100-a-b-c-d-e-fCoaBbSicPdCueCf having an amorphous phase as a main phase is provided. Parameters satisfy the following conditions: 3.5≤a≤4.5 at %, 6≤b≤15 at %, 2≤c≤11 at %, 3≤d≤5 at %, 0.5≤e≤1.1 at %, and 0≤f≤2 at %. With this composition, the alloy powder has good magnetic characteristics even when it has a large particle diameter such as 90 μm. Therefore, yield thereof is improved.