公开(公告)号：US20210407713A1

公开(公告)日：2021-12-30

申请号：US17331555

申请日：2021-05-26

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

Inventor： Yang LUO ,  Wei ZHU ,  Dunbo YU ,  Zilong WANG ,  Hongbin ZHANG ,  Xinyuan BAI ,  Xiao LIN ,  Haijun PENG ,  Jiajun XIE

IPC: H01F1/057 ,  C22C38/00

Abstract: The present invention relates to a modified sintered Nd—Fe—B magnet, and a preparation method and a use thereof. The modified sintered Nd—Fe—B magnet is prepared by performing grain boundary diffusion on a matrix, wherein the matrix is a sintered Nd—Fe—B magnet; a grain boundary diffusion source for the grain boundary diffusion consists of a first diffusion source and a second diffusion source; the first diffusion source is a PrMx alloy, M being at least one selected from a group consisted of Cu, Al, Zn, Mg, Ga, Sn, Ag, Pb, Bi, Ni, Nb, Mn, Co, Fe, Ti, Cr, Zr, Mo and Ge; and the second diffusion source is heavy rare earth Dy and/or Tb. A wider and longer diffusion channel formed by a low-melting-point alloy containing Pr preferentially entering the inside of the magnet is used as a channel for rapid diffusion of a heavy rare earth element

公开(公告)号：US20200263280A1

公开(公告)日：2020-08-20

申请号：US16791088

申请日：2020-02-14

Applicant: GRIREM ADVANCED MATERIALS CO., LTD.

Inventor： Yang LUO ,  Xiao LIN ,  Guiyong WU ,  Jiajun XIE ,  Zilong WANG ,  Wenlong YAN ,  Zhongkai WANG ,  Dunbo YU

IPC: C22C38/00 ,  H01F1/059 ,  H01F41/02 ,  B22F9/04 ,  B22F1/00

Abstract: The present disclosure discloses an yttrium (Y)-added rare-earth permanent magnetic material and a preparation method thereof. A chemical formula of the material expressed in atomic percentage is (YxRE1-x)aFebalMbNc, wherein 0.05≤x≤0.4, 7≤a≤13, 0≤b≤3, 5≤c≤20, and the balance is Fe, namely, bal=100-a-b-c; RE represents a rare-earth element Sm, or a combination of the rare-earth element Sm and any one or more elements of Zr, Nd and Pr; M represents Co and/or Nb; and N represents nitrogen. In the preparation method, the rare-earth element Y is utilized to replace the element Sm of a samarium-iron-nitrogen material. By regulating a ratio of the element Sm to the element Y, viscosity of an alloy liquid can be reduced, and an amorphous forming ability of the material is enhanced.

公开(公告)号：US20210343459A1

公开(公告)日：2021-11-04

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: H01F1/22 ,  H01F7/02 ,  C22C38/00 ,  C22C38/10 ,  C22C38/06 ,  C22C38/16 ,  C22C38/14

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.