公开(公告)号：US20240112857A1

公开(公告)日：2024-04-04

申请号：US18478965

申请日：2023-09-29

Applicant: NICHIA CORPORATION

Inventor： Takashi ASADA ,  Shuichi TADA

IPC: H01F41/02 ,  B22F1/05 ,  B22F1/142 ,  B22F1/145 ,  B22F3/02 ,  B22F3/26 ,  H01F1/059

CPC classification number: H01F41/0266 ,  B22F1/05 ,  B22F1/142 ,  B22F1/145 ,  B22F3/02 ,  B22F3/26 ,  H01F1/059 ,  B22F2003/248 ,  B22F2301/355 ,  B22F2998/10

Abstract: A method of preparing an anisotropic magnetic powder compression molded product, the method including: compressing a magnetic powder in a mold using a compression punch while magnetically orienting the magnetic powder to obtain a compressed magnetic powder, wherein the compression punch has a contact surface with the magnetic powder that is not perpendicular to a compression direction; and compression molding the compressed magnetic powder using a molding punch having a different shape from the compression punch.

公开(公告)号：US20200211742A1

公开(公告)日：2020-07-02

申请号：US16728320

申请日：2019-12-27

Applicant: NICHIA CORPORATION

Inventor： Takashi ASADA ,  Shuichi TADA

IPC: H01F1/059 ,  H01F1/20 ,  H01F1/055

Abstract: The present disclosure aims to provide a bonded magnet having good magnetic properties and a method of preparing the bonded magnet. The present disclosure provides a method of preparing a bonded magnet, including: a first compression step of compressing a magnetic powder having an average particle size of 10 μm or less while magnetically orienting it to obtain a first molded article; a second compression step of bringing the first molded article into contact with a thermosetting resin having a viscosity of 200 mPa·s or less, followed by compression to obtain a second molded article; and a heat treatment step of heat treating the second molded article.

公开(公告)号：US20230374257A1

公开(公告)日：2023-11-23

申请号：US18318924

申请日：2023-05-17

Applicant: NICHIA CORPORATION

Inventor： Shuichi TADA ,  Takashi ASADA ,  Masahiro ABE

IPC: C08K3/08 ,  C08L63/00 ,  H01F1/059 ,  H01F1/06 ,  C08G59/50

CPC classification number: C08K3/08 ,  C08L63/00 ,  H01F1/059 ,  H01F1/06 ,  C08G59/5033 ,  C08K2201/01 ,  C08K2201/005

Abstract: A method, including: preparing at least one magnetic powder having an average particle size that is at least 1 μm but not more than 10 μm, at least one thermosetting resin, and at least one curing agent, wherein at least one of the thermosetting resin and the curing agent includes at least one monomer having a melting point that is higher than 70° C. but not higher than 140° C., and wherein an amount of the monomer having the melting point that is higher than 70° C. but not higher than 140° C. is at least 33% by volume but not more than 100% by volume of a combined amount of the thermosetting resin and the curing agent; and obtaining a magnetic powder-containing resin composition by kneading the magnetic powder, the thermosetting resin, and the curing agent at a temperature of higher than 70° C. but not higher than 140° C. and then lowering the temperature.

公开(公告)号：US20230360827A1

公开(公告)日：2023-11-09

申请号：US18318290

申请日：2023-05-16

Applicant: NICHIA CORPORATION

Inventor： Takashi ASADA ,  Shuichi TADA

IPC: H01F1/059 ,  H01F1/20 ,  H01F1/055

CPC classification number: H01F1/059 ,  H01F1/0558 ,  H01F1/20

Abstract: The present disclosure aims to provide a bonded magnet having good magnetic properties and a method of preparing the bonded magnet. The present disclosure provides a method of preparing a bonded magnet, including: a first compression step of compressing a magnetic powder having an average particle size of 10 µm or less while magnetically orienting it to obtain a first molded article; a second compression step of bringing the first molded article into contact with a thermosetting resin having a viscosity of 200 mPa·s or less, followed by compression to obtain a second molded article; and a heat treatment step of heat treating the second molded article.