IP Library › Granted Patent US 10,242,777
Granted Patent B2
US 10,242,777 · App. 15/420,151 · Granted Mar 26, 2019

Alloy for R-T-B based sintered magnet and R-T-B based sintered magnet

Inventors: 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)
Assignee: TDK Corporation
H01F1/0557B22F1/0059B22F3/1017B22F9/026C22C38/002C22C38/005C22C38/06C22C38/10C22C38/14C22C38/16H01F1/0577H01F41/0293B22F2009/044B22F2202/05B22F2301/35B22F2998/10B22F2999/00C22C33/02C22C2202/02
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Quick Facts
Patent No.
US 10,242,777
App. No.
15/420,151
Granted
Mar 26, 2019
Kind
B2
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.

Claims (7)

1. A sintered magnet, wherein

the sintered magnet 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, wherein

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.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 22, 2017
From: IWASAKI, MAKOTO; HIDAKA, TETSUYA; HAYAKAWA, TAKUMA; KAKOKI, AYATO; FUJIKAWA, YOSHINORI; GOTO, SYOTA; NAKAJIMA, HARUNA; MASUDA, TAKESHI; ISHIZAKA, CHIKARA
To: TDK CORPORATION
Reel/Frame 041329/0608 →
Priority Claims (1)
JP 2016-017200 · Feb 1, 2016 · national
Continuity (1)
Related Publication 20170221616A1 · Aug 3, 2017