公开(公告)号：EP3599625A1

公开(公告)日：2020-01-29

申请号：EP19187271.2

申请日：2019-07-19

申请人： Yantai Shougang Magnetic Materials Inc.

发明人： WANG, Chuanshen ,  PENG, Zhongjie ,  YANG, Kunkun

IPC分类号： H01F41/02

摘要： The invention relates to a method of increasing the coercivity of a sintered type NdFeB permanent magnet. The method comprises preparation of a diffusion source for a heavy rare earth element by adsorption of a heavy rare earth powder on at least one side of an adhesive organic film. The heavy rare earth diffusion source is applied on the surface of the sintered type NdFeB permanent magnet. Furthermore, in order to diffuse the element of heavy rare earth into the sintered type NdFeB permanent magnet along a grain boundary, a diffusion and aging treatment is performed. The method enhances coercivity while hardly reducing the remanence.

公开(公告)号：EP3591676A1

公开(公告)日：2020-01-08

申请号：EP19183244.3

申请日：2019-06-28

申请人： Yantai Shougang Magnetic Materials Inc.

发明人： YANG, Kunkun ,  PENG, Zhongjie ,  WANG, Chuanshen

IPC分类号： H01F41/02

摘要： The invention discloses a gradient NdFeB magnet and a production method, It is characterized by providing a gradient changing magnet by covering and diffusing heavy rare earth elements in the partial area of NdFeB magnet, According to coercive force of the gradient NdFeB magnet, it can be divided into 3 different regions along the direction which perpendicular to the direction of magnetization, the coercivity is high near the edge and low near the center: The gradient NdFeB magnet of the present invention has a high coercive force only in the easy demagnetization region of the edge of the magnet, and does not undergo diffusion treatment in the remaining portion, and the heavy rare earth material is used less.

公开(公告)号：EP3599626A1

公开(公告)日：2020-01-29

申请号：EP19187288.6

申请日：2019-07-19

申请人： Yantai Shougang Magnetic Materials Inc.

发明人： YANG, Kunkun ,  PENG, Zhongjie ,  WANG, Chuanshen

IPC分类号： H01F41/02

摘要： The present invention mainly relates to a method of improving the coercive force of NdFeB magnet. The method comprises coating an organic binder on a surface of a NdFeB magnet, adhering the heavy rare earth powder on the surface of the NdFeB magnet by the bonding action of the organic binder, subjecting the NdFeB magnet coated with the heavy rare earth powder to high temperature diffusion and aging treatment, causing the organic binder to decompose and to volatilize at high temperatures and the heavy rare earth elements to diffuse into the NdFeB magnet. The coercive force of the NdFeB magnet is improved without substantially reducing the remanence.