公开(公告)号：US20240420873A1

公开(公告)日：2024-12-19

申请号：US18721567

申请日：2023-12-21

Applicant: SICHUAN UNIVERSITY

Inventor： Ying LIU ,  Renquan WANG ,  Jun LI ,  Hongxing CHEN ,  Yao XIAO

IPC: H01F1/057 ,  B22F1/00 ,  B22F3/14 ,  B22F3/16 ,  B22F3/20 ,  B22F9/00 ,  B22F9/04 ,  C22C24/00 ,  C22C38/00 ,  C22C38/10

Abstract: Disclosed are an anisotropic nanocrystalline rare earth permanent magnet and a preparation method thereof. The rare earth permanent magnet includes an RE—Fe—B matrix phase and a second phase, wherein the RE—Fe—B matrix phase includes main phase RE2Fe14B flaky nanocrystallines regularly arranged and an RE-rich phase around main phase grains, the main phase RE2Fe14B flaky nanocrystallines having an average grain size in a length direction of 70 nm to 800 nm and an average grain size in a thickness direction of 30 nm to 200 nm; and the second phase includes at least one selected from the group consisting of an M-Cu phase and an M—Cu—O phase, M being at least one selected from the group consisting of Ca and Mg.

公开(公告)号：US20240331937A1

公开(公告)日：2024-10-03

申请号：US18713575

申请日：2023-11-24

Applicant: SICHUAN UNIVERSITY

Inventor： Ying LIU ,  Renquan WANG ,  Jun LI ,  Hongxing CHEN ,  Yao XIAO

IPC: H01F41/02 ,  C22C38/00 ,  H01F1/057

CPC classification number: H01F41/0266 ,  C22C38/005 ,  H01F1/0576

Abstract: Disclosed are a method for preparing an anisotropic flake nanocrystalline rare earth permanent magnet material and a rare earth permanent magnet material. In the disclosure, the method includes: step 1, preparation of a precursor flake nanocrystal magnetic powder, where a number of grains of flake nanocrystals inside the precursor flake nanocrystalline magnetic powder accounts for not less than 85% of a total number of grains inside the precursor flake nanocrystalline magnetic powder; step 2, orientation treatment by hot deformation: subjecting the precursor flake nanocrystalline magnetic powder or a green body prepared from the precursor flake nanocrystalline magnetic powder to the hot deformation, such that flake nanocrystals are regularly arranged; and step 3, post-processing for optimizing orientation.