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。