公开(公告)号：EP4082691A1

公开(公告)日：2022-11-02

申请号：EP20905090.5

申请日：2020-12-24

申请人： Hitachi Metals, Ltd.

发明人： FUJIMORI, Nobuhiko ,  OBATA, Tohru ,  SONODA, Kazuhiro ,  KUNIYOSHI, Futoshi ,  FURUSAWA, Daisuke ,  MAKI, Tomohito ,  MINO, Shuji ,  SAITOU, Kouta

IPC分类号： B22F1/00 ,  B22F9/04 ,  C22C38/00 ,  H01F41/02 ,  H01F1/057 ,  B22F3/00 ,  B22F3/02 ,  B22F3/24

摘要： A method for manufacturing an R-T-B based sintered magnet according the present disclosure comprises: a step for preparing a coarse ground powder which is made from an alloy for R-T-B based sintered magnets and which has an average particle size of 10-500 µm; a step for obtaining a fine powder having an average particle size of 2.0-4.5 µm, by feeding the coarse ground powder to a jet mill device that has a grinding chamber filled with inert gas and grinding the coarse ground powder; and a step for producing a sintered body of the fine powder, wherein the inert gas has been humidified, and the oxygen content of the R-T-B based sintered magnet is 1000-3500 ppm by mass.

公开(公告)号：EP2043114B1

公开(公告)日：2019-01-02

申请号：EP07831943.1

申请日：2007-11-15

申请人： Hitachi Metals, Ltd.

发明人： NOZAWA, Noriyuki ,  NISHIUCHI, Takeshi ,  HIROSAWA, Satoshi ,  MAKI, Tomohito

IPC分类号： H01F1/057 ,  H01F41/02 ,  B22F3/11 ,  C22C38/00 ,  B22F3/24

公开(公告)号：EP4012729A1

公开(公告)日：2022-06-15

申请号：EP21863034.1

申请日：2021-09-10

申请人： Tohoku University ,  Hitachi Metals, Ltd.

发明人： KAINUMA, Ryosuke ,  OMORI, Toshihiro ,  XU, Xiao ,  HASHIMOTO, Naoki ,  MAKI, Tomohito

IPC分类号： H01F1/047 ,  B22F3/00 ,  B22F9/04 ,  C22C1/04 ,  C22C22/00 ,  C22F1/00 ,  C22F1/16 ,  H01F1/08 ,  H01F41/02

摘要： A permanent magnet alloy according to the present disclosure contains Mn at a content not lower than 41% by atom and not higher than 53% by atom; Al at a content not lower than 46% by atom and not higher than 53% by atom; and Cu at a content not lower than 0.5% by atom and not higher than 10% by atom. The alloy contains a stable phase, having a tetragonal structure, at a ratio not lower than 50%.

公开(公告)号：EP1970916A1

公开(公告)日：2008-09-17

申请号：EP07743651.7

申请日：2007-05-18

申请人： Hitachi Metals, Ltd.

发明人： NISHIUCHI, Takeshi ,  NOZAWA, Noriyuki ,  HIROSAWA, Satoshi ,  MAKI, Tomohito ,  BEKKI, Katsunori

IPC分类号： H01F1/08 ,  H01F1/053 ,  H01F1/06 ,  H01F41/02

CPC分类号： H01F1/057 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0578 ,  H01F1/0579 ,  H01F41/028 ,  Y10T428/12153

摘要： An R-Fe-B based porous magnet according to the present invention has an aggregate structure of Nd 2 Fe 14 B type crystalline phases with an average grain size of 0.1 µm to 1 µm. At least a portion of the magnet is porous and has micropores with a major axis of 1 µm to 20 µm.

摘要翻译： 根据本发明的R-Fe-B系多孔磁体具有平均粒径为0.1μm〜1μm的Nd 2 Fe 14 B型结晶相的集合体。 磁体的至少一部分是多孔的并且具有长轴为1μm至20μm的微孔。

公开(公告)号：EP1970916B1

公开(公告)日：2015-04-01

申请号：EP07743651.7

申请日：2007-05-18

申请人： Hitachi Metals, Ltd.

发明人： NISHIUCHI, Takeshi ,  NOZAWA, Noriyuki ,  HIROSAWA, Satoshi ,  MAKI, Tomohito ,  BEKKI, Katsunori

IPC分类号： H01F1/08 ,  H01F1/053 ,  H01F1/06 ,  H01F41/02 ,  H01F1/057

CPC分类号： H01F1/057 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0578 ,  H01F1/0579 ,  H01F41/028 ,  Y10T428/12153

公开(公告)号：EP2043114A1

公开(公告)日：2009-04-01

申请号：EP07831943.1

申请日：2007-11-15

申请人： Hitachi Metals, Ltd.

发明人： NOZAWA, Noriyuki ,  NISHIUCHI, Takeshi ,  HIROSAWA, Satoshi ,  MAKI, Tomohito

IPC分类号： H01F41/02 ,  B22F1/00 ,  B22F3/00 ,  B22F3/24 ,  B22F3/26 ,  B22F9/04 ,  C22C38/00 ,  H01F1/053 ,  H01F1/08

CPC分类号： H01F41/0273 ,  B22F3/11 ,  B22F2003/248 ,  B22F2998/10 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0573 ,  H01F1/0576 ,  H01F1/0577 ,  H01F1/0578 ,  H01F41/0293 ,  B22F3/02 ,  B22F3/24

摘要： According to the present invention, an R-Fe-B based rare-earth alloy powder with a mean particle size of less than 20 µm is provided and compacted to make a powder compact. Next, the powder compact is subjected to a heat treatment at a temperature of 550 °C to less than 1,000 °C within hydrogen gas, thereby producing hydrogenation and disproportionation reactions (HD processes). Then, the powder compact is subjected to another heat treatment at a temperature of 550 °C to less than 1,000 °C within either a vacuum or an inert atmosphere, thereby producing desorption and recombination reactions and obtaining a porous material including fine crystal grains, of which the density is 60% to 90% of their true density and which have an average crystal grain size of 0.01 µm to 2 µm (DR processes). Thereafter, the porous material is subjected to yet another heat treatment at a temperature of 750 °C to less than 1,000 °C within either the vacuum or the inert atmosphere, thereby further increasing its density to 93% or more of their true density and making an R-Fe-B based microcrystalline high-density magnet.

摘要翻译： 根据本发明，提供平均粒径小于20μm的R-Fe-B类稀土合金粉末并压实成粉末成形体。 接着，在氢气中，在550℃〜1000℃的温度下对粉体进行热处理，从而进行氢化和歧化反应（HD工序）。 然后，在真空或惰性气氛中，在550〜1000℃的温度下进行另一次热处理，由此进行解吸和复合反应，得到包含微细晶粒的多孔材料 其密度为其真密度的60％至90％，并且其平均晶粒尺寸为0.01μm至2μm（DR工艺）。 此后，在真空或惰性气氛中，在750℃至小于1000℃的温度下对多孔材料进行另外的热处理，从而进一步将其密度增加至其真实密度的93％以上 一种R-Fe-B系微晶高密度磁体。