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.:
Date of Patent:
May. 12, 2026
Filed:
Sep. 03, 2021
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Noritsugu Sakuma, Mishima, JP;
Tetsuya Shoji, Susono, JP;
Akihito Kinoshita, Mishima, JP;
Akira Kato, Mishima, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
To provide an R—Fe—B-based rare earth magnet excellent in the squareness and magnetic properties at high temperatures, and method for producing thereof. The present disclosure relates to a rare earth magnet including a main phaseand a grain boundary phasepresent around the main phase, and a method for producing thereof. In the rare earth magnet of the present disclosure, the overall composition is represented, in terms of molar ratio, by the formula: (RLa)(FeCo)BM, wherein Ris a predetermined rare earth element, Mis a predetermined element, 0≤x≤0.1, 12.0≤y≤20.0, 0.1≤z≤0.3, 5.0≤w≤20.0, and 0≤v≤2.0. The main phasehas an RFeB-type crystal structure, the average particle diameter of the main phaseis less than 1 μm, and the volume ratio of a phase having an RFe-type crystal structure in the grain boundary phaseis 0.40 or less relative to the grain boundary phase