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:
Oct. 12, 2021
Filed:
Mar. 26, 2019
Tdk Corporation, Tokyo, JP;
Mariko Fujiwara, Tokyo, JP;
Masashi Miwa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
An R-T-B-based sintered magnetcontains a rare earth element R, a transition metal element T, B, Ga, and O, the sintered magnetincludes a magnet bodyand an oxidized layercovering the magnet body, the magnet bodyincludes main phase grainscontaining a crystal of RTB and a grain boundary phasepositioned between the main phase grainsand containing R, the oxidized layerincludes a plurality of oxide phasesA containing R, T, Ga, and O, the oxide phaseA satisfies the following Formulas (1) and (2) regarding the content (unit: atom %) of each element, and the oxide phaseA in the oxidized layercovers the grain boundary phasein the magnet body0.3≤[R]/[T]≤0.5  (1)0.2≤[O]/([R]+[T]+[Ga]+[O])≤0.7  (2)