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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 9892831 B1

PDFFull Text
Date of Patent:
Feb. 13, 2018

Filed:

Mar. 31, 2016

R-fe—b sintered magnet and making method

Applicant:

Shin-etsu Chemical Co., Ltd., Tokyo, JP;

Inventors:

Koichi Hirota, Echizen, JP;

Hiroaki Nagata, Echizen, JP;

Tetsuya Kume, Echizen, JP;

Hajime Nakamura, Echizen, JP;

Assignee:

SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

C Melissa Koslow

Int. Cl.
CPC ...
B22F 3/00 (2006.01); H01F 1/057 (2006.01); B22F 3/24 (2006.01); B22F 9/02 (2006.01); B22F 9/04 (2006.01); H01F 41/02 (2006.01); C22C 33/02 (2006.01);
U.S. Cl.
CPC ...
H01F 1/0577 (2013.01); B22F 3/24 (2013.01); B22F 9/023 (2013.01); B22F 9/04 (2013.01); C22C 33/0278 (2013.01); H01F 41/0266 (2013.01); H01F 41/0293 (2013.01); B22F 2998/10 (2013.01); B22F 2999/00 (2013.01); C22C 2202/02 (2013.01); H01F 1/0573 (2013.01);
Abstract

The invention provides an R—Fe—B sintered magnet consisting essentially of 12-17 at % of R, 0.1-3 at % of M, 0.05-0.5 at % of M, 4.8+2*m to 5.9+2*m at % of B, and the balance of Fe, containing R(Fe,(Co))B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with a HR-rich layer and a (R,HR)—Fe(Co)-Mphase wherein HR is Tb, Dy or Ho. The sintered magnet exhibits a coercivity ≧10 kOe despite a low content of Dy, Tb, and Ho.

Find Patent Forward Citations

Hirota, Koichi. (2018). R-fe—b sintered magnet and making method (U.S. Patent No. 9892831). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9892831

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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