公开(公告)号：US20180012701A1

公开(公告)日：2018-01-11

申请号：US15539585

申请日：2016-01-08

申请人： INTERMETALLICS CO., LTD.

发明人： Masato SAGAWA ,  Yasuhiro UNE ,  Hirokazu KUBO ,  Satoshi SUGIMOTO ,  Masashi MATSUURA ,  Michihide NAKAMURA

IPC分类号： H01F41/02 ,  C22C38/00 ,  B22F9/04 ,  B22F3/10 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  H01F1/053 ,  C22C28/00

CPC分类号： H01F41/0266 ,  B22F3/10 ,  B22F9/04 ,  B22F2009/044 ,  B22F2202/05 ,  C22C28/00 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0536 ,  H01F1/057 ,  H01F41/02

摘要： A method for producing an RFeB system sintered magnet according to the present invention includes: a process (S1) of preparing a lump of HDDR-treated raw material alloy that contains a polycrystalline substance including crystal grains having an average grain size of 1 μm or less in terms of an equivalent circle diameter calculated from an electron micrograph image, by an HDDR treatment including steps of heating a lump of RFeB system alloy containing 26.5 to 29.5% by weight of the rare-earth element R, in a hydrogen atmosphere at a temperature between 700 and 1,000° C., and changing the atmosphere to vacuum while maintaining the temperature within a range from 750 to 900° C.; a process (S2) of preparing a lump of raw material alloy having a high rare-earth content by heating the lump of HDDR-treated raw material alloy at a temperature between 700 and 950° C. in a state where the HDDR-treated raw material alloy is in contact with a contact substance including a second alloy that contains the rare-earth element R at a higher content ratio than a content ratio of the rare-earth element R in the RFeB system alloy; a process (S3) of preparing raw material alloy powder by fine pulverization of the lump of raw material alloy having a high rare-earth content into powder having an average particle size of 1 μm or less; an orienting process (S4) including steps of placing the raw material alloy powder in a mold, and applying a magnetic field to the raw material alloy powder without conducting compression molding; and a sintering process (S5) including a step of heating the oriented raw material alloy powder at a temperature between 850 and 1,050° C.

公开(公告)号：US20170278604A1

公开(公告)日：2017-09-28

申请号：US15503814

申请日：2015-08-18

申请人： INTERMETALLICS CO., LTD.

发明人： Yasuhiro UNE ,  Hirokazu KUBO ,  Masato SAGAWA ,  Satoshi SUGIMOTO ,  Masashi MATSUURA ,  Michihide NAKAMURA

IPC分类号： H01F1/057 ,  C22C38/10 ,  C22C38/06 ,  H02K1/02 ,  B22F3/16 ,  B22F9/02 ,  H01F41/02 ,  C22C38/16 ,  C22C38/00

CPC分类号： H01F1/0577 ,  B22F3/02 ,  B22F3/16 ,  B22F9/023 ,  B22F2009/042 ,  B22F2009/044 ,  B22F2301/355 ,  B22F2304/05 ,  B22F2998/10 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  H01F1/0573 ,  H01F41/0266 ,  H02K1/02

摘要： An RFeB system sintered magnet which does not contain a heavy rare-earth element RH (Dy, Tb and Ho) in a practically effective amount and yet is suited for applications in which the magnet undergoes a temperature increase during its use. The RFeB system sintered magnet contains at least one element selected from the group consisting of Nd and Pr as a rare-earth element R in addition to Fe and B while containing none of Dy, Tb and Ho, the magnet having a temperature characteristic value t(100-23) which satisfies −0.58

公开(公告)号：US20160027564A1

公开(公告)日：2016-01-28

申请号：US14773877

申请日：2014-03-12

申请人： INTERMETALLICS CO., LTD.

发明人： Yasuhiro UNE ,  Hirokazu KUBO ,  Masato SAGAWA ,  Satoshi SUGIMOTO ,  Masashi MATSUURA ,  Michihide NAKAMURA

IPC分类号： H01F1/057 ,  B22F3/10 ,  B22F9/04 ,  H01F41/02 ,  C22C38/00 ,  C22C38/16 ,  C22C38/06 ,  C22C38/10 ,  C22C33/02 ,  B22F9/02

CPC分类号： H01F1/0577 ,  B22F1/0044 ,  B22F3/10 ,  B22F9/023 ,  B22F9/04 ,  B22F2009/048 ,  B22F2202/05 ,  B22F2999/00 ,  C22C33/02 ,  C22C33/0207 ,  C22C38/00 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2202/02 ,  H01F41/0253 ,  B22F1/0018

摘要： A method for producing an RFeB system sintered magnet with the main phase grains having a grain size of 1 μm or less with a considerably equal grain size, including: preparing a shaped body oriented by a magnetic field and sintering the shaped body, wherein the shaped body is prepared using an alloy powder of an RFeB material having a particle size distribution with an average value of 1 μm or less in terms of a circle-equivalent diameter determined from a microscope image, the alloy powder obtained by pulverizing coarse particles having fine crystal grain, each coarse particle having grains of the RFeB material formed inside, the crystal grains having a crystal grain size distribution with an average value of 1 μm or less in terms of the circle-equivalent diameter determined from a microscope image, and 90% by area or more of the crystal grains being separated from each other.

摘要翻译： 一种具有晶粒尺寸为1μm以下的主相晶粒的RFeB系烧结磁体的制造方法，具有相当大的粒径，包括：准备通过磁场取向的成形体并烧结成形体，其中成形 使用由显微镜图像确定的圆当量直径的平均值为1μm以下的RFeB材料的合金粉末制造的本体，通过粉碎具有微细晶体的粗大粒子得到的合金粉末 颗粒，每个粗颗粒具有内部形成的RFeB材料的晶粒，晶粒的晶粒尺寸分布的平均值为1μm以下，以显微镜图像确定的圆当量直径为90％， 晶粒的面积以上分离。