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. 31, 2019
Filed:
Feb. 04, 2016
Applicant:
Tdk Corporation, Tokyo, JP;
Inventors:
Masashi Miwa, Tokyo, JP;
Takurou Iwasa, Tokyo, JP;
Assignee:
TDK CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 3/10 (2006.01); H01F 7/02 (2006.01); H01F 1/057 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0577 (2013.01);
Abstract
An R-T-B based sintered magnet has a high coercivity even if the carbon content becomes high accompanying the micronization of the finely pulverized particles of the raw material. The R-T-B based sintered magnet includes an R-T-B based compound as main phase grains, wherein, the R-T-B based sintered magnet contains 0.1 mass % to 0.3 mass % of C, and an R—Ga—C concentrated part exists in the grain boundary formed between or among two or more adjacent main phase grains, and the concentrations of R, Ga and C in the R—Ga—C concentrated part are higher than those in the main phase grains respectively.