公开(公告)号：US10020097B2

公开(公告)日：2018-07-10

申请号：US14257512

申请日：2014-04-21

Applicant: SHOWA DENKO K.K.

Inventor： Kenichiro Nakajima ,  Akifumi Muraoka ,  Takashi Yamazaki

IPC: H01F1/053 ,  H01F41/02 ,  B22F3/12 ,  H01F1/057 ,  C22C38/00 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42

CPC classification number: H01F1/0536 ,  B22F2998/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  C22C38/42 ,  C22C2202/02 ,  H01F1/0577 ,  H01F41/0266 ,  H01F41/0293 ,  B22F3/02 ,  B22F3/10

Abstract: A method of manufacturing an R-T-B rare earth sintered magnet includes a process of disposing and sintering a compact of a first alloy powder and an alloy material of a second alloy in a chamber of a sintering furnace. The first alloy consists of R which represents a rare earth element, T which represents a transition metal essentially containing Fe, a metal element M which represents Al and/or Ga, B, Cu, and inevitable impurities. The first alloy contains 11 at % to 17 at % of R, 4.5 at % to 6 at % of B, 0 at % to 1.6 at % of M, and T as the balance, and Dy content in all of the rare earth elements is 0 at % to 29 at %. The second alloy consists of R which represents a rare earth element, T which represents a transition metal essentially containing Fe, a metal element M which represents Al and/or Ga, B, Cu, and inevitable impurities. The second alloy contains 11 at % to 20 at % of R, 4.5 at % to 6 at % of B, and 0 at % to 1.6 at % of M, and T as the balance, and Dy content in all of the rare earth elements is 0 at % to 29 at %.

公开(公告)号：US09558872B2

公开(公告)日：2017-01-31

申请号：US14146098

申请日：2014-01-02

Applicant: SHOWA DENKO K.K.

Inventor： Takashi Yamazaki ,  Kenichiro Nakajima

IPC: H01F1/053 ,  H01F1/40 ,  H01F1/057 ,  H01F41/02

CPC classification number: H01F1/40 ,  B22F1/0055 ,  B22F2998/10 ,  B22F2999/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0571 ,  H01F1/0577 ,  H01F41/0266 ,  H01F41/0273 ,  H01F41/0293 ,  B22F1/0059 ,  B22F3/03 ,  B22F3/10 ,  B22F2003/248 ,  B22F2009/044 ,  B22F2009/048 ,  B22F2009/049 ,  B22F2201/02 ,  B22F2201/11 ,  B22F2202/05

Abstract: An R-T-B rare earth sintered magnet contains R which represents a rare earth element; T which represents a transition metal essentially containing Fe; a metal element M which represents Al and/or Ga; B; Cu; and inevitable impurities the R-T-B rare earth sintered magnet including 13.4 to 17 at % of R, 4.5 to 5.5 at % of B, and 0.1 to 2.0 at % of M, and T as the balance; in which the R-T-B rare earth sintered magnet is formed of a sintered body which includes a main phase composed of R2Fe14B and a grain boundary phase including a larger amount of R than the main phase; in which the magnetization direction of the main phase is a c-axis direction, in which crystal grains of the main phase have one of an elliptical shape and an oval shape extended in such a direction so as to cross the c-axis direction; and in which the grain boundary phase includes an R-rich phase in which the total atomic concentration of the rare earth elements is 70 at % or greater and a transition metal-rich phase in which the total atomic concentration of the rare earth elements is 25 to 35 at %.

Abstract translation: R-T-B稀土烧结磁体包含表示稀土元素的R， T代表基本上含有Fe的过渡金属; 代表Al和/或Ga的金属元素M; B; 铜 和R-T-B系稀土类烧结磁体的不可避免的杂质，其中R为13.4〜17原子％，B为4.5〜5.5原子％，M为0.1〜2.0原子％，余量为T; 其中R-T-B稀土烧结磁体由包括由R2Fe14B组成的主相和包含比主相大的R的晶界相的烧结体形成; 其中主相的磁化方向是c轴方向，其中主相的晶粒具有椭圆形和椭圆形之一，沿着与c轴方向交叉的方向延伸; 并且其中晶界相包括稀土元素的总原子浓度为70原子％以上的富R相，以及稀土元素的总原子浓度为25的过渡金属富集相 至35原子％。