公开(公告)号：US20250014791A1

公开(公告)日：2025-01-09

申请号：US18712397

申请日：2022-11-09

Applicant: NICHIA CORPORATION

Inventor： Jun AKAMATSU ,  Satoshi ABE ,  Masahiro ABE ,  Kenta IWAI ,  Satoshi YAMANAKA ,  Shuichi TADA ,  Nobuyoshi IMAOKA

IPC: H01F1/055 ,  B22F1/145 ,  H01F1/059 ,  H05K9/00

Abstract: A method of producing a magnetic powder includes performing a phosphorus treatment to obtain a phosphorus compound and a rare earth-iron-nitrogen-based magnetic powder, the phosphorus treatment including adding an inorganic acid to a slurry containing: a rare earth-iron-nitrogen-based magnetic powder containing R, Fe, and N, where R represents at least one of rare earth elements selected from the group consisting of Y, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Sm, and if R contains Sm, Sm constitutes less than 50 atm % of a total R atomic content; water; and a phosphorus-containing substance.

公开(公告)号：US20220157520A1

公开(公告)日：2022-05-19

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: H01F41/02 ,  H01F1/057 ,  B29B7/88 ,  B29C45/00

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：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.

公开(公告)号：US20200098495A1

公开(公告)日：2020-03-26

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 ,  C04B41/00 ,  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：US20190027286A1

公开(公告)日：2019-01-24

申请号：US16040342

申请日：2018-07-19

Applicant: NICHIA CORPORATION

Inventor： Shuichi TADA ,  Satoshi YAMANAKA

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

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：US20240006101A1

公开(公告)日：2024-01-04

申请号：US18253534

申请日：2021-09-30

Applicant: NICHIA CORPORATION

Inventor： Masahiro ABE ,  Satoshi YAMANAKA ,  Shuichi TADA ,  Kenta IWAI ,  Takayuki YANO

IPC: H01F1/059 ,  H01F1/055

CPC classification number: H01F1/059 ,  H01F1/0558 ,  H01F1/0552

Abstract: A method for producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method includes a phosphate treatment of adding an inorganic acid to a slurry containing an SmFeN-based anisotropic magnetic powder, water, and a phosphate compound to adjust a pH of the slurry to a range of 1 to 4.5 to form a phosphate-coated SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate.

公开(公告)号：US20220351882A1

公开(公告)日：2022-11-03

申请号：US17812715

申请日：2022-07-14

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：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：US20180315526A1

公开(公告)日：2018-11-01

申请号：US15965300

申请日：2018-04-27

Applicant: NICHIA CORPORATION

Inventor： Rie YOSHIDA ,  Masahiro ABE ,  Michiya KUME ,  Kohei IHARA ,  Shuichi TADA

IPC: H01F1/053 ,  C08L77/02 ,  H01F7/02 ,  H01F1/059 ,  H01F41/02 ,  B29C45/00

CPC classification number: H01F1/083 ,  B22F1/0059 ,  H01F1/113 ,  H01F41/0266

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.

公开(公告)号：US20250037910A1

公开(公告)日：2025-01-30

申请号：US18916088

申请日：2024-10-15

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.