公开(公告)号：US20240212899A1

公开(公告)日：2024-06-27

申请号：US18486470

申请日：2023-10-13

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

Inventor： Haijun PENG ,  Yang LUO ,  Zilong WANG ,  Shengjie ZHU ,  Dunbo YU ,  Hongbin ZHANG ,  Weikang SHAN ,  Tianjiao MA ,  Shuai CUI

IPC: H01F1/059 ,  B22F1/05 ,  B22F1/065 ,  B22F1/142 ,  B22F1/145 ,  B22F9/22 ,  C22C33/02 ,  C22C38/00

CPC classification number: H01F1/059 ,  B22F1/05 ,  B22F1/065 ,  B22F1/142 ,  B22F1/145 ,  B22F9/22 ,  C22C33/0235 ,  C22C38/001 ,  C22C38/005 ,  B22F2201/016 ,  B22F2201/02 ,  B22F2201/20 ,  B22F2301/355 ,  B22F2304/10 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02

Abstract: Disclosed are anisotropic samarium-iron-nitrogen magnetic alloy powder and a preparation method therefor. The anisotropic samarium-iron-nitrogen magnetic alloy powder has a chemical formula of Sm2Fe17N3, and has a Th2Zn17 crystal structure. In the alloy powder, the granularity is: D90≤5 μm and D10≥0.5 μm, the average sphericity ≥0.7, the coercivity Hcj≥10 kOe, and the square degree Q≥0.5. The preparation method includes: S1: mixing iron powder, samarium oxide powder and calcium granules uniformly; S2: placing the mixture into a rotating heat treatment furnace, adding high-temperature-resistant balls, performing vacuumizing, introducing a reductive diffusion protective gas, and heating a furnace body; S3: cooling the furnace body, performing vacuumizing, and introducing a nitriding gas; and S4: taking out and separating the cooled powder and balls, washing the powder, and drying the powder in a vacuum environment to obtain the anisotropic samarium-iron-nitrogen magnetic alloy powder.

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.