公开(公告)号：US11705257B2

公开(公告)日：2023-07-18

申请号：US17244880

申请日：2021-04-29

Applicant: GRIREM ADVANCED MATERIALS CO., LTD. ,  Rare Earth Functional Materials (Xiong 'an) Innovation Center Co., Ltd ,  Grirem (Rongcheng) Co., Ltd.

Inventor： Yang Luo ,  Dunbo Yu ,  Wei Zhu ,  Xinyuan Bai ,  Xiao Lin ,  Shengjie Zhu ,  Zilong Wang ,  Haijun Peng

IPC: H01F1/057 ,  H01F41/02 ,  B22F3/24 ,  H01F1/22 ,  H01F7/02 ,  C22C38/00 ,  C22C38/14 ,  C22C38/06 ,  C22C38/16 ,  C22C38/10

CPC classification number: H01F1/22 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C38/16 ,  H01F7/02

Abstract: The present invention relates to an R-T-B sintered magnet and a preparation method thereof. The sintered magnet includes a grain boundary region T1, a shell layer region T2 and an R2Fe14B grain region T3; at 10 μm to 60 μm from a surface of the sintered magnet toward a center thereof, an area ratio of the shell layer region T2 to the R2Fe14B grain region T3 is 0.1 to 0.3, and a thickness of the shell layer region T2 is 0.5 μm to 1.2 μm; and an average coating percent of the shell layer region T2 on the R2Fe14B grain region T3 is 80% or more. In the present invention, by optimizing a preparation process and a microstructure of a traditional rare earth permanent magnet, diffusion efficiency of heavy rare earth in the magnet is improved, such that coercivity of the magnet is greatly improved, and manufacturing cost is reduced.

公开(公告)号：US11101057B2

公开(公告)日：2021-08-24

申请号：US15868063

申请日：2018-01-11

Applicant: GRIREM ADVANCED MATERIALS CO., LTD.

Inventor： Guiyong Wu ,  Yang Luo ,  Hongwei Li ,  Yuanfei Yang ,  Dunbo Yu ,  Ningtao Quan ,  Chao Yuan ,  Wenlong Yan

IPC: C22C38/00 ,  H01F1/059 ,  C23C8/24 ,  H01F1/08 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/28 ,  C23C8/26 ,  H01F41/02 ,  C22C33/02 ,  B22F9/04 ,  B22F9/08 ,  B22F3/02 ,  B22F5/00 ,  B22F1/00

Abstract: Provided are a highly thermostable rare-earth permanent magnetic material, a preparation method thereof and a magnet containing the same. A composition of the rare-earth permanent magnetic material by an atomic percentage is as follows: SmxRaFe100-x-y-z-aMyNz, wherein R is at least one of Zr and Hf, M is at least one of Co, Ti, Nb, Cr, V, Mo, Si, Ga, Ni, Mn and Al, x+a is 7-10%, a is 0-1.5%, y is 0-5% and z is 10-14%.

公开(公告)号：US20210134499A1

公开(公告)日：2021-05-06

申请号：US17090710

申请日：2020-11-05

Applicant: GRIREM ADVANCED MATERIALS CO., LTD. ,  GRIREM HI-TECH CO., LTD.

Inventor： Yang Luo ,  Zhongkai Wang ,  Yuanfei Yang ,  Zilong Wang ,  Dunbo Yu ,  Yifan Liao ,  Jiajun Xie ,  Zhou Hu

IPC: H01F1/057 ,  H01F1/059 ,  H01F41/02 ,  B22F1/00

Abstract: The invention discloses a composite rare earth anisotropic bonded magnet and a preparation method thereof. The composite rare earth anisotropic bonded magnet comprises a Nd—Fe—B magnetic powder, a Sm—Fe—N magnetic powder, a binder and an inorganic nano-dispersant. The preparation method comprises steps of preparing a Nd—Fe—B magnetic powder by a HDDR method, preparing a Sm—Fe—N magnetic powder by a powder metallurgy method, mixing the Nd—Fe—B magnetic powder, the Sm—Fe—N magnetic powder, the binder and the inorganic nano-dispersant at a specific ratio to finally obtain the composite rare earth anisotropic bonded magnet. The invention, by adding an inorganic nano-dispersant, enables the full dispersion of the fine Sm—Fe—N powder during the mixing process of the binder, the Nd—Fe—B magnetic powder and the Sm—Fe—N powder, and thus makes the fine Sm—Fe—N powder and the binder evenly coated on the surface of the anisotropic Nd—Fe—B magnetic powder.

公开(公告)号：US10811175B2

公开(公告)日：2020-10-20

申请号：US15796153

申请日：2017-10-27

Applicant: GRIREM ADVANCED MATERIALS CO., LTD.

Inventor： Yang Luo ,  Chao Yuan ,  Kuo Men ,  Ningtao Quan ,  Hongbin Zhang ,  Wenlong Yan ,  Dunbo Yu ,  Yuanfei Yang

IPC: H01F1/055 ,  B22F9/04 ,  C22C33/02 ,  C22C1/04 ,  H01F1/057 ,  C22C1/03 ,  C22C28/00 ,  C22C38/00 ,  C22C38/10

Abstract: An alloy material, a bonded magnet, and a modification method of a rare-earth permanent magnetic powder are provided by the present application. A melting point of the alloy material is lower than 600° C. and a composition of the alloy material by an atomic part is RE100-x-yMxNy, wherein RE is one or more of non-heavy rare-earth Nd, Pr, Sm, La and Ce, M is one or more of Cu, Al, Zn and Mg, N is one or more of Ga, In and Sn, x=10-35 and y=1-15.

公开(公告)号：US20180182517A1

公开(公告)日：2018-06-28

申请号：US15796153

申请日：2017-10-27

Applicant: GRIREM ADVANCED MATERIALS CO., LTD.

Inventor： Yang Luo ,  Chao Yuan ,  Kuo Men ,  Ningtao Quan ,  Hongbin Zhang ,  Wenlong Yan ,  Dunbo Yu ,  Yuanfei Yang

IPC: H01F1/055 ,  C22C38/00 ,  C22C38/10 ,  C22C28/00 ,  C22C1/03 ,  B22F9/04

Abstract: An alloy material, a bonded magnet, and a modification method of a rare-earth permanent magnetic powder are provided by the present application. A melting point of the alloy material is lower than 600° C. and a composition of the alloy material by an atomic part is RE100-x-yMxNy, wherein RE is one or more of non-heavy rare-earth Nd, Pr, Sm, La and Ce, M is one or more of Cu, Al, Zn and Mg, N is one or more of Ga, In and Sn, x=10-35 and y=1-15.