公开(公告)号：US20230207166A1

公开(公告)日：2023-06-29

申请号：US18146752

申请日：2022-12-27

Applicant: NICHIA CORPORATION

Inventor： Masahiro Abe ,  Satoshi Yamanaka ,  Shuichi Tada ,  Kenta Iwai

IPC: H01F1/059 ,  H01F41/02 ,  B22F1/16 ,  B22F1/145 ,  B22F1/142

CPC classification number: H01F1/059 ,  H01F41/026 ,  B22F1/16 ,  B22F1/145 ,  B22F1/142 ,  B22F2201/03 ,  B22F2302/45 ,  B22F2301/45 ,  B22F2998/10

Abstract: A method of producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method including performing a phosphate treatment including adding an inorganic acid to a slurry containing a raw material SmFeN-based anisotropic magnetic powder, water, a phosphate compound, and a rare earth compound so that the slurry is adjusted to have a pH of at least 1 and not higher than 4.5 to obtain a phosphate-coated SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate.

公开(公告)号：US11694826B2

公开(公告)日：2023-07-04

申请号：US16728320

申请日：2019-12-27

Applicant: NICHIA CORPORATION

Inventor： Takashi Asada ,  Shuichi Tada

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

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.

公开(公告)号：US11270820B2

公开(公告)日：2022-03-08

申请号：US16040342

申请日：2018-07-19

Applicant: NICHIA CORPORATION

Inventor： Shuichi Tada ,  Satoshi Yamanaka

IPC: H01F1/153 ,  H01F1/059 ,  H01F1/053 ,  C08L71/10 ,  C08L23/12 ,  C08K5/09 ,  C08L51/06

Abstract: The present invention relates to a composition for bonded magnets having good hot water resistance and a method of manufacturing the composition. The method of manufacturing a composition for bonded magnets includes: obtaining a first kneaded mixture by kneading a rare earth-iron-nitrogen-based magnetic powder and an acid-modified polypropylene resin; and obtaining a second kneaded mixture by kneading the first kneaded mixture with a polypropylene resin and an amorphous resin having a glass transition temperature of 120° C. or higher and 250° C. or lower, wherein, with respect to 100 parts by weight of the rare earth-iron-nitrogen-based magnetic powder, the amount of the acid-modified polypropylene resin is 3.5 parts by weight or greater and less than 10.4 parts by weight, and the total amount of the polypropylene resin and the amorphous resin is 0.35 part by weight or greater and less than 3.88 parts by weight.

公开(公告)号：US09597828B2

公开(公告)日：2017-03-21

申请号：US13727449

申请日：2012-12-26

Applicant: NICHIA CORPORATION

Inventor： Shinji Yoshima ,  Muneo Yamamoto ,  Shuichi Tada ,  Akihiro Imayama

IPC: B29C47/00 ,  B29C47/20 ,  B29C47/92 ,  H01F41/02

CPC classification number: B29C47/0004 ,  B29C47/0023 ,  B29C47/0066 ,  B29C47/20 ,  B29C47/92 ,  B29C2947/92704 ,  B29K2995/0008 ,  H01F41/028

Abstract: In a method for manufacturing a cylindrical bonded magnet, a molding space having a cylindrical shape is filled with a bonded magnet composition containing a magnetic material and a resin. The magnetic material disposed in the molding space is magnetically oriented using an orientation magnet. The orientation magnet includes a first permanent magnet and a second permanent magnet. The first and second permanent magnets are disposed such that same poles are opposite each other in the axial direction.

公开(公告)号：US12230438B2

公开(公告)日：2025-02-18

申请号：US17455155

申请日：2021-11-16

Applicant: NICHIA CORPORATION

Inventor： Satoshi Yamanaka ,  Takayuki Yano ,  Shuichi Tada ,  Masahiro Abe ,  Kenta Iwai

IPC: B29C45/00 ,  B29B7/88 ,  H01F1/057 ,  H01F41/02 ,  B29K77/00 ,  B29K505/00

Abstract: A method of producing a compound for bonded magnets, the method including: heat-curing a thermosetting resin and a curing agent having a ratio of the number of reactive groups of the curing agent to the number of reactive groups of the thermosetting resin of at least 2 but not higher than 11 to obtain an additive for bonded magnets; and kneading the additive for bonded magnets, magnetic powder, and a thermoplastic resin to obtain a compound for bonded magnets in which a filling ratio of the magnetic powder is at least 91.5% by mass.

公开(公告)号：US11424055B2

公开(公告)日：2022-08-23

申请号：US16582614

申请日：2019-09-25

Applicant: NICHIA CORPORATION

Inventor： Rieko Yoshimoto ,  Satoshi Yamanaka ,  Shuichi Tada ,  Hideaki Yoshiwara

IPC: H01F1/055 ,  B05D3/14 ,  B05D7/24 ,  H01F1/059 ,  C04B41/00 ,  C04B41/52 ,  C04B41/89

Abstract: Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.

公开(公告)号：US12148554B2

公开(公告)日：2024-11-19

申请号：US16586889

申请日：2019-09-27

Applicant: NICHIA CORPORATION

Inventor： Shuichi Tada

IPC: H01F1/055 ,  C22C38/00 ,  H01F1/059 ,  H01F41/02 ,  H02K1/02

Abstract: The present invention provides a bonded magnet having good heat resistance. The present invention relates to a bonded magnet containing a SmFeN magnetic powder, nylon 12, and a hexafluoroisopropanol-unextractable component. The present invention also relates to a method of preparing a bonded magnet, including: bringing a raw material bonded magnet containing a SmFeN magnetic powder and nylon 12 into contact with an amorphizing agent; and heat-treating the raw material bonded magnet in contact with the amorphizing agent.

公开(公告)号：US11862372B2

公开(公告)日：2024-01-02

申请号：US17588117

申请日：2022-01-28

Applicant: NICHIA CORPORATION

Inventor： Shuichi Tada ,  Satoshi Yamanaka

IPC: H01F1/059 ,  H01F1/053 ,  H01F1/153 ,  C08K5/09 ,  C08L71/10 ,  C08L23/12 ,  C08L51/06

CPC classification number: H01F1/15375 ,  C08K5/09 ,  C08L23/12 ,  C08L51/06 ,  C08L71/10 ,  H01F1/053 ,  H01F1/059 ,  C08K2201/01 ,  C08L51/06 ,  C08K3/10 ,  C08L23/12

Abstract: The present invention relates to a composition for bonded magnets having good hot water resistance and a method of manufacturing the composition. The method of manufacturing a composition for bonded magnets includes: obtaining a first kneaded mixture by kneading a rare earth-iron-nitrogen-based magnetic powder and an acid-modified polypropylene resin; and obtaining a second kneaded mixture by kneading the first kneaded mixture with a polypropylene resin and an amorphous resin having a glass transition temperature of 120° C. or higher and 250° C. or lower, wherein, with respect to 100 parts by weight of the rare earth-iron-nitrogen-based magnetic powder, the amount of the acid-modified polypropylene resin is 3.5 parts by weight or greater and less than 10.4 parts by weight, and the total amount of the polypropylene resin and the amorphous resin is 0.35 part by weight or greater and less than 3.88 parts by weight.

公开(公告)号：US11710586B2

公开(公告)日：2023-07-25

申请号：US17812715

申请日：2022-07-14

Applicant: NICHIA CORPORATION

Inventor： Rieko Yoshimoto ,  Satoshi Yamanaka ,  Shuichi Tada ,  Hideaki Yoshiwara

IPC: H01F1/059 ,  C04B41/00 ,  H01F1/055 ,  B05D3/14 ,  B05D7/24 ,  C04B41/52 ,  C04B41/89

CPC classification number: H01F1/0552 ,  B05D3/142 ,  B05D7/24 ,  C04B41/009 ,  C04B41/0054 ,  C04B41/52 ,  C04B41/89 ,  H01F1/059

Abstract: Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.

公开(公告)号：US11646154B2

公开(公告)日：2023-05-09

申请号：US17303571

申请日：2021-06-02

Applicant: NICHIA CORPORATION

Inventor： Rie Yoshida ,  Masahiro Abe ,  Michiya Kume ,  Kohei Ihara ,  Shuichi Tada

IPC: H01F1/053 ,  H01F7/02 ,  H01F1/059 ,  C08L77/02 ,  H01F41/02 ,  B29C45/00 ,  H01F1/08 ,  H01F1/113 ,  B29K77/00 ,  B29K683/00 ,  B29K505/12 ,  B29K105/16 ,  B29K105/00 ,  B29C45/14 ,  B22F7/08 ,  B22F3/22

CPC classification number: H01F1/0533 ,  B29C45/0013 ,  C08L77/02 ,  H01F1/059 ,  H01F1/083 ,  H01F1/113 ,  H01F7/02 ,  H01F41/0266 ,  B22F3/225 ,  B22F7/08 ,  B22F2998/10 ,  B29C45/1459 ,  B29K2077/00 ,  B29K2105/0044 ,  B29K2105/16 ,  B29K2505/12 ,  B29K2683/00 ,  B29K2995/0008 ,  B22F2998/10 ,  B22F1/10 ,  B22F3/225

Abstract: The present invention relates to a composite component including a metal component having a substantially cylindrical shape or a substantially annular shape, and a ring-shaped bonded magnet disposed on the outer periphery of the metal component, the ring-shaped bonded magnet containing a thermoplastic resin, magnetic particles, and rubber particles.