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:
Mar. 26, 2019
Filed:
Jan. 31, 2017
Tdk Corporation, Tokyo, JP;
Makoto Iwasaki, Tokyo, JP;
Tetsuya Hidaka, Tokyo, JP;
Takuma Hayakawa, Tokyo, JP;
Ayato Kakoki, Tokyo, JP;
Yoshinori Fujikawa, Tokyo, JP;
Syota Goto, Tokyo, JP;
Haruna Nakajima, Tokyo, JP;
Takeshi Masuda, Tokyo, JP;
Chikara Ishizaka, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.