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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12027306 B1

PDFFull Text
Date of Patent:
Jul. 02, 2024

Filed:

Jun. 10, 2022

Method of producing smfen-based rare earth magnet

Applicants:

Nichia Corporation, Anan, JP;

Toyota Jidosha Kabushiki Kaisha, Toyota, JP;

Inventors:

Hisashi Maehara, Itano-gun, JP;

Michiya Kume, Anan, JP;

Masaaki Ito, Anjo, JP;

Assignees:

NICHIA CORPORATION, Anan, JP;

TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;

Attorney:

Hunton Andrews Kurth LLP

Primary Examiner:

Adil A Siddiqui

Int. Cl.
CPC ...
H01F 41/02 (2006.01); B22F 1/00 (2022.01); B22F 1/05 (2022.01); B22F 1/102 (2022.01); B22F 1/12 (2022.01); B22F 3/16 (2006.01); B22F 3/24 (2006.01); C22C 38/00 (2006.01); H01F 1/055 (2006.01); H01F 1/059 (2006.01);
U.S. Cl.
CPC ...
H01F 41/0266 (2013.01); B22F 1/05 (2022.01); B22F 1/09 (2022.01); B22F 1/102 (2022.01); B22F 1/12 (2022.01); B22F 3/16 (2013.01); B22F 3/24 (2013.01); C22C 38/001 (2013.01); C22C 38/005 (2013.01); H01F 1/059 (2013.01); H01F 41/0273 (2013.01); B22F 2003/248 (2013.01); B22F 2301/30 (2013.01); B22F 2301/355 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); C22C 2202/02 (2013.01); H01F 1/0558 (2013.01);
Abstract

A method of producing a SmFeN-based rare earth magnet, the method including: dispersing a SmFeN-based anisotropic magnetic powder comprising Sm, Fe, and N using a resin-coated metal media or a resin-coated ceramic media to obtain a dispersed SmFeN-based anisotropic magnetic powder; mixing the dispersed SmFeN-based anisotropic magnetic powder with a modifier powder to obtain a powder mixture; compacting the powder mixture in a magnetic field to obtain a magnetic field compact; pressure-sintering the magnetic field compact to obtain a sintered compact; and heat treating the sintered compact.

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