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:
Dec. 23, 2025
Filed:
Oct. 25, 2021
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Noritsugu Sakuma, Mishima, JP;
Tetsuya Shoji, Susono, JP;
Akihito Kinoshita, Mishima, JP;
Katsunori Danno, Obu, JP;
Daisuke Ichigozaki, Toyota, JP;
Masaaki Ito, Anjo, JP;
Reimi Sakaguchi, Nisshin, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
The present disclosure provides a rare earth magnet having a main phase and a grain boundary phase and a manufacturing method therefor. In the rare earth magnet of the present disclosure, the overall composition is represented by a formula (RLaCe)(FeCo)BM. (Ris a predetermined rare earth element, Mis a predetermined element, and the followings are satisfied, 0.05≤x≤0.25, 0.5≤y/(x+y)≤0.50, 13.5≤u≤20.0, 0≤z≤0.100, 5.0≤w≤10.0, and 0≤v≤2.00). The main phase has an RFeB-type crystal structure, and the average grain size and the volume fraction of the main phase are respectively 1.0 μm to 20.0 μm and 80.0% to 90.0%. The main phase and the grain boundary phase satisfy, (the existence proportion of La in the grain boundary phase)/(the existence proportion of La in the main phase)>1.30.