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:
Feb. 25, 2020
Filed:
Nov. 14, 2016
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Koichi Hirota, Echizen, JP;
Masayuki Kamata, Echizen, JP;
Takahiro Hashimoto, Echizen, JP;
Hajime Nakamura, Echizen, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
An R—(Fe,Co)—B base sintered magnet consisting essentially of 12-17 at % of R containing Nd and Pr, 0.1-3 at % of M(typically Si), 0.05-0.5 at % of M(typically Ti), B, and the balance of Fe, and containing R(Fe,Co)B as a main phase has a coercivity of at least 10 kOe. The magnet contains a Mboride phase at a grain boundary triple junction, and has a core/shell structure that the main phase is covered with a grain boundary phase. The grain boundary phase is composed of an amorphous and/or nanocrystalline R'—(Fe,Co)—M′ phase consisting essentially of 25-35 at % of R′ containing Pr, 2-8 at % of M′ (typically Si), up to 8 at % of Co, and the balance of Fe. A coverage of the main phase with the R′—(Fe,Co)—M′ phase is at least 50%, and the bi-granular grain boundary phase has a width of at least 50 nm.