Method for improvement of magnetic performance of sintered NdFeB lamellar magnet
First Claim
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1. A method for improvement of magnetic performance of a sintered NdFeB magnet, comprising:
- a material consisting of element R, H and X is firstly covered on a surface of the sintered NdFeB magnet to form a finish coat, and is proceeded with a diffusion treatment and an aging treatment to the sintered NdFeB magnet with the finish coat in the environment of vacuum or inert gas,wherein, R is at least one of such elements as Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,H is hydrogen,X is at least one of such elements as C, O, N, S, B and Si,wherein in the material consisting of element R, H and X, content of the element H in terms of mass percentage is 0.5%-2%, and content of the element X in terms of mass percentage is 0.5%-10%,wherein the sintered NdFeB magnet with the finish coat shall subject to a dehydrogenation treatment prior to the diffusion treatment, and the hydrogen content in the finish coat of the sintered NdFeB magnet in terms of mass percentage is 0.001%-0.2% after the dehydrogenation treatment.
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Abstract
A method for improvement of magnetic performance of sintered NdFeB magnet includes the following steps. Firstly, material containing element R, H and X is to be covered on a surface of the sintered NdFeB magnet to form a finish coat. After that, proceed with a diffusion treatment and an aging treatment to the sintered NdFeB magnet with the finish coat in the environment of vacuum or inert gas. R is at least one of such elements as Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu. H is hydrogen. X is at least one of such elements as C, O, N, S, B, Cl and Si.
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9 Claims
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1. A method for improvement of magnetic performance of a sintered NdFeB magnet, comprising:
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a material consisting of element R, H and X is firstly covered on a surface of the sintered NdFeB magnet to form a finish coat, and is proceeded with a diffusion treatment and an aging treatment to the sintered NdFeB magnet with the finish coat in the environment of vacuum or inert gas, wherein, R is at least one of such elements as Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, H is hydrogen, X is at least one of such elements as C, O, N, S, B and Si, wherein in the material consisting of element R, H and X, content of the element H in terms of mass percentage is 0.5%-2%, and content of the element X in terms of mass percentage is 0.5%-10%, wherein the sintered NdFeB magnet with the finish coat shall subject to a dehydrogenation treatment prior to the diffusion treatment, and the hydrogen content in the finish coat of the sintered NdFeB magnet in terms of mass percentage is 0.001%-0.2% after the dehydrogenation treatment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Current AssigneeNingbo Yunsheng Company Limited, NingBo Yunsheng Magnet Devices Technology Co., Ltd.
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Original AssigneeNingbo Yunsheng Company Limited
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InventorsLv, Xiangke, Wang, Chunguo, Zhang, Min, Ding, Yong, Yang, Qingzhong, Hu, Yiqun, Wang, Jiangfeng
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Primary Examiner(s)Zimmer, Anthony J
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Assistant Examiner(s)Morales, Ricardo D
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Application NumberUS15/742,531Publication NumberTime in Patent Office1,491 DaysField of Search148102US Class CurrentCPC Class CodesC21D 3/06 Extraction of hydrogenC23C 12/02 Diffusion in one stepH01F 1/057 and IIIa elements, e.g. Nd2...H01F 1/0577 sinteredH01F 41/0293 diffusion of rare earth ele...Y02P 10/20 Recycling
