Title:
Ｒ−Ｆｅ−Ｂ系焼結磁石及びその製造方法
Document Type and Number:
Japanese Patent JP6724865
Kind Code:
B2
Abstract:
An R-Fe-B base sintered magnet is provided consisting essentially of R (which is at least two rare earth elements and essentially contains Nd and Pr), M 1 which is at least two of Si, Al, Mn, Ni, Cu, Zn, Ga, Ge, Pd, Ag, Cd, In, Sn, Sb, Pt, Au, Hg, Pb, and Bi, M 2 which is at least one of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W, boron, and the balance of Fe, and containing an intermetallic compound R 2 (Fe,(Co)) 14 B as a main phase. The magnet contains an R-Fe(Co)-M 1 phase as a grain boundary phase, the R-Fe(Co)-M 1 phase contains A phase which is crystalline with crystallites of at least 10 nm formed at grain boundary triple junctions, and B phase which is amorphous and/or nanocrystalline with crystallites of less than 10 nm formed at intergranular grain boundaries and optionally grain boundary triple junctions.
Inventors:
Koichi Hirota
Tetsuya Kume
Masayuki Kamada
Tetsuya Kume
Masayuki Kamada
Application Number:
JP2017109597A
Publication Date:
July 15, 2020
Filing Date:
June 02, 2017
Export Citation:
Assignee:
Shin-Etsu Chemical Co., Ltd.
International Classes:
H01F1/057; B22F3/00; B22F3/02; B22F3/24; C21D6/00; C22C38/00; H01F41/02
Foreign References:
| WO2016043039A1 | ||||
| WO2012161355A1 |
Attorney, Agent or Firm:
Hideaki International Patent Office