公开(公告)号：US20170330658A1

公开(公告)日：2017-11-16

申请号：US15521131

申请日：2014-12-08

Applicant: LG ELECTRONICS INC.

Inventor： Seok NAMKUNG ,  Deokhai PARK ,  Namseok KANG

IPC: H01F1/057 ,  C22C33/02 ,  C22C1/04 ,  H01F41/02

CPC classification number: H01F1/0577 ,  B22F3/14 ,  B22F2998/10 ,  C22C1/0475 ,  C22C12/00 ,  C22C21/00 ,  C22C23/06 ,  C22C28/00 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C38/10 ,  C22C38/16 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/0576 ,  H01F41/0293 ,  B22F2003/248

Abstract: An R-TM-B hot-pressed and deformed magnet (here, R represents a rare earth metal selected from the group consisting of Nd, Dy, Pr, Tb, Ho, Sm, Sc, Y, La, Ce, Pm, Eu, Gd, Er, Tm, Yb, Lu, and a combination thereof, and TM represents a transition metal) of the present invention comprises flat type anisotropic magnetized crystal grains and a nonmagnetic alloy distributed in a boundary surface between the crystal grains, and thus the magnet of the present invention has an excellent magnetic shielding effect as compared with an existing permanent magnet since the crystal gains can be completely enclosed in the nonmagnetic alloy, so that a hot-pressed and deformed magnet with enhanced coercive force can be manufactured through a more economical process.

公开(公告)号：US20230066150A1

公开(公告)日：2023-03-02

申请号：US17797976

申请日：2020-02-06

Applicant: LG ELECTRONICS INC. ,  NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Sunyong SONG ,  Seok NAMKUNG ,  Xin TANG ,  Hossein SEPEHRIAMIN ,  Tadakatsu OHKUBO ,  Kazuhiro HONO ,  Jiangnan LI

IPC: H01F1/057

Abstract: A rare-earth magnet according to an embodiment of the present invention comprises: a rare-earth magnet precursor including a composition of (R1(1-x)R2x)yFe(100-y-z-v-w)CozBvTMlw in which R1 comprises at least one of Nd or Pr, and R2 comprises Ce; and a diffusion metal including a composition of (LRE(100-p-q)HREp)TM2q, and diffused on the surface of the rare-earth magnet precursor, wherein the LRE in the diffusion metal can comprise light rare earth including Y, and the HRE can comprise heavy rare earth.

公开(公告)号：US20160086704A1

公开(公告)日：2016-03-24

申请号：US14889589

申请日：2014-07-24

Applicant: LG ELECTRONICS INC.

Inventor： Seok NAMKUNG ,  Nameseok KANG ,  Deokhai PARK

IPC: H01F1/057 ,  B22F3/24 ,  B22F9/30 ,  B22F3/16 ,  H01F41/02 ,  B22F9/04

CPC classification number: H01F1/0577 ,  B22F3/16 ,  B22F3/24 ,  B22F9/04 ,  B22F9/30 ,  B22F2003/248 ,  B22F2301/20 ,  B22F2301/205 ,  B22F2301/35 ,  B22F2301/45 ,  B22F2302/45 ,  B22F2998/10 ,  C22C28/00 ,  C22C33/02 ,  C22C2202/02 ,  H01F1/0576 ,  H01F41/0266 ,  H01F41/0293 ,  B22F1/0003 ,  B22F3/12

Abstract: The method for fabricating an R—Fe—B hot-deformed magnet according to the present invention includes: preparing an R—Fe—B magnetic powder; mixing the magnetic powder with a high-melting point metal or a metal compound including the high-melting point metal; press sintering the mixture; and hot-deforming the sintered body by applying heat and pressure, and thus may suppress the growth of crystal grains, and does not need a sintering process of 1,000° C. or more, and the magnetization direction of crystal grains is arranged in one direction even without applying the magnetic field by the hot deformation, and thus, a hot-deformed magnet may be more economically produced. Further, the R—Fe—B hot deformed magnet of the present invention includes a structure in which anisotropic plate-shaped crystal grains of uniform size having an average diameter of 400 to 900 nm are evenly distributed throughout the magnet, and has a uniform and minute size of crystal grains in the magnet, and thus, may secure excellent coercive force, and plate-shaped crystal grains formed by the hot deformation may have excellent residual magnetic flux density because the magnetization direction is arranged in one direction.

Abstract translation: 根据本发明的制造R-Fe-B热变形磁体的方法包括：制备R-Fe-B磁性粉末; 将磁粉与高熔点金属或包含高熔点金属的金属化合物混合; 压制烧结混合物; 并且通过施加热和压力使烧结体热变形，从而可以抑制晶粒的生长，并且不需要1000℃以上的烧结处理，并且晶粒的磁化方向在一个方向上排列 即使没有通过热变形来施加磁场，因此可以更经济地制造热变形磁体。 此外，本发明的R-Fe-B热变形磁体包括平均直径为400〜900nm的均匀尺寸的各向异性板状晶粒均匀分布在整个磁体中的结构， 磁体中的晶粒的微小尺寸，因此可以确保优异的矫顽力，并且由于热变形而形成的板状晶粒可能具有优异的剩余磁通密度，因为磁化方向被布置在一个方向上。