Title:
R-T-B系焼結磁石およびその製造方法
Document Type and Number:
Japanese Patent JP5477282
Kind Code:
B2
Abstract:
An R-T-B based sintered magnet according to the present invention has a composition including: 27.3 mass% to 29.5 mass% of R; 0.92 mass% to 1 mass% of B; 0.05 mass% to 0.3 mass% of Cu; 0.02 mass% to 0.5 mass% of M; and T as the balance, and has an oxygen content of 0.02 mass% to 0.2 mass%. The main phase of the sintered magnet is an R 2 T 14 B type compound. The crystal grain size of the main phase is represented by an equivalent circle diameter of 8 µm or less. And crystal grains with equivalent circle diameters of 4 µm or less account for at least 80% of the overall area of the main phase.
Inventors:
Kuniyoshi Ta
Rintaro Ishii
Rintaro Ishii
Application Number:
JP2010505384A
Publication Date:
April 23, 2014
Filing Date:
March 30, 2009
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
H01F1/057; B22F3/02; C22C33/02; C22C38/00; H01F1/08; H01F41/02
Domestic Patent References:
| JP2005015886A | 2005-01-20 | |||
| JP2006165008A | 2006-06-22 | |||
| JP2005197300A | 2005-07-21 | |||
| JP2005197301A | 2005-07-21 | |||
| JP2005136015A | 2005-05-26 | |||
| JP2006303433A | 2006-11-02 | |||
| JP2002373822A | 2002-12-26 | |||
| JP2006270087A | 2006-10-05 | |||
| JP2005290398A | 2005-10-20 | |||
| JP2005015886A | 2005-01-20 | |||
| JP2006165008A | 2006-06-22 | |||
| JP2005197300A | 2005-07-21 | |||
| JP2005197301A | 2005-07-21 | |||
| JPS62158854A | 1987-07-14 | |||
| JP2004303909A | 2004-10-28 | |||
| JPH05205927A | 1993-08-13 |
Foreign References:
| WO2005001856A1 | 2005-01-06 |
Attorney, Agent or Firm:
Seiji Okuda
Osamu Kita
Osamu Kita