Invention Grant
- Patent Title: Method of preparing a high-coercivity sintered NdFeB magnet
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Application No.: US17575665Application Date: 2022-01-14
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Publication No.: US11854736B2Publication Date: 2023-12-26
- Inventor: Kunkun Yang , Chuanshen Wang , Zhongjie Peng , Kaihong Ding
- Applicant: Yantai Dongxing Magnetic Materials Inc.
- Applicant Address: CN Shandong
- Assignee: Yantai Dongxing Magnetic Materials Inc.
- Current Assignee: Yantai Dongxing Magnetic Materials Inc.
- Current Assignee Address: CN Shandong
- Agent Gang Yu
- Priority: CN 2110052347.0 2021.01.15
- Main IPC: H01F41/02
- IPC: H01F41/02 ; B22F1/17 ; B22F3/16 ; B22F3/24 ; C22C38/14 ; C22C38/06 ; C22C38/16 ; C22C38/00 ; C22C38/10 ; H01F1/057
Abstract:
The present disclosure provides a method for preparing a high-coercivity sintered NdFeB magnet. The method including the steps of:
S1, Providing a NdFeB powder as a main material;
S2, Vacuum coating a layer of a rare earth alloy RxH(100-x) on a surface of a metal nano-powder M to obtain an auxiliary alloy material with a core-shell structure, with R being selected from one or more of Dy, Tb, Pr, Nd, La, and Ce; H being selected from one or more of Cu, Al, and Ga; the nano-powder M being selected from one or more of Mo, W, Zr, Ti, and Nb; 0≤x≤90 wt. %;
S3, Adding the auxiliary alloy material obtained by step S2 to the NdFeB powder of step S1 and mixing, then orientation pressing of the mixture to obtain a compact body; and
S4, Sintering and annealing treatment of the compact body to obtain the high-coercivity sintered NdFeB magnet.
S1, Providing a NdFeB powder as a main material;
S2, Vacuum coating a layer of a rare earth alloy RxH(100-x) on a surface of a metal nano-powder M to obtain an auxiliary alloy material with a core-shell structure, with R being selected from one or more of Dy, Tb, Pr, Nd, La, and Ce; H being selected from one or more of Cu, Al, and Ga; the nano-powder M being selected from one or more of Mo, W, Zr, Ti, and Nb; 0≤x≤90 wt. %;
S3, Adding the auxiliary alloy material obtained by step S2 to the NdFeB powder of step S1 and mixing, then orientation pressing of the mixture to obtain a compact body; and
S4, Sintering and annealing treatment of the compact body to obtain the high-coercivity sintered NdFeB magnet.
Public/Granted literature
- US20220230805A1 Method of preparing a high-coercivity sintered NdFeB magnet Public/Granted day:2022-07-21
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