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：US20220362843A1

公开(公告)日：2022-11-17

申请号：US17815792

申请日：2022-07-28

Applicant: NICHIA CORPORATION

Inventor： Satoshi YAMANAKA ,  Takayuki YANO

IPC: B22F1/102 ,  H01F1/059 ,  H01F1/055

Abstract: Included is a method of preparing a compound for bonded magnets, the method including: coating a magnetic material having an average particle size of 10 μm or less with a thermosetting resin and a curing agent at a ratio of the equivalent weight of the curing agent to the equivalent weight of the thermosetting resin of 2 or higher and 10 or lower to obtain a coated material; granulating the coated material by compression to obtain a granulated product; milling the granulated product to obtain a milled product; and surface treating the milled product with a silane coupling agent to obtain a compound for bonded magnets, the method either including, between the granulation and the milling, heat curing the granulated product to obtain a cured product, or including, between the milling and the surface treatment, heat curing the milled product to obtain a cured product.

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.