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Patent Agency Ranking
1.发明授权公开(公告)号：US12092707B2
公开(公告)日：2024-09-17
申请号：US18422131
申请日：2024-01-25
Inventor： Jinghui Di , Huiqiang Liu , Xiongfei Wu , Shengli Jia , Hui Meng , Qifeng Wei
CPC classification number: G01R33/1215 , H01F1/0571
Abstract: The present application relates to a technical field of determining an irreversible demagnetization of a grain boundary diffusion NdFeB magnet, and more particularly, to a method for identifying an irreversible demagnetization of a grain boundary diffusion NdFeB magnet by magnetic field distribution. After applying a reverse magnetic field to a saturatedly magnetized grain boundary diffusion NdFeB magnet, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased, it is determined that there is an irreversible demagnetization in the grain boundary diffusion NdFeB magnet.
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2.发明授权公开(公告)号：US11921174B1
公开(公告)日：2024-03-05
申请号：US18220392
申请日：2023-07-11
Inventor： Jinghui Di , Huiqiang Liu , Xiongfei Wu , Shengli Jia , Hui Meng , Qifeng Wei
CPC classification number: G01R33/1215 , H01F1/0571
Abstract: The present application relates to a technical field of determining an irreversible demagnetization of a grain boundary diffusion NdFeB magnet, and more particularly, to a method for identifying an irreversible demagnetization of a grain boundary diffusion NdFeB magnet by magnetic field distribution. After applying a reverse magnetic field to a saturatedly magnetized grain boundary diffusion NdFeB magnet, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased, it is determined that there is an irreversible demagnetization in the grain boundary diffusion NdFeB magnet.
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公开(公告)号：US11783972B2
公开(公告)日：2023-10-10
申请号：US17524740
申请日：2021-11-11
Inventor： Jinghui Di , Qifeng Wei , Shujun Shen , Shengli Jia , Lichun Zhan , Pengfei Ge
Abstract: The present application relates to a preparation method of neodymium iron boron products and the neodymium iron boron product prepared by using the same. The preparation method of neodymium iron boron products includes the following steps: Step S1: preparing blank magnet; Step S2: obtaining preprocessed sheets; Step S3: surface treating; Step S4: heavy rare earth coating; Step S5: stacking: stacking a plurality of preprocessed sheets to give stacked magnets; and Step S6: grain boundary diffusion: successively subjecting the stacked magnets to a primary heat treatment for 2-40 min, a secondary heat treatment at 700-1000° C. for 4-40 h, and then tempering at 450-700° C., in which the primary heat treatment is induction heat treatment or electric spark sintering.
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4.发明公开公开(公告)号：US20240168110A1
公开(公告)日：2024-05-23
申请号：US18422131
申请日：2024-01-25
Inventor： Jinghui DI , Huiqiang LIU , Xiongfei WU , Shengli JIA , Hui MENG , Qifeng WEI
CPC classification number: G01R33/1215 , H01F1/0571
Abstract: The present application relates to a technical field of determining an irreversible demagnetization of a grain boundary diffusion NdFeB magnet, and more particularly, to a method for identifying an irreversible demagnetization of a grain boundary diffusion NdFeB magnet by magnetic field distribution. After applying a reverse magnetic field to a saturatedly magnetized grain boundary diffusion NdFeB magnet, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased, it is determined that there is an irreversible demagnetization in the grain boundary diffusion NdFeB magnet.
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公开(公告)号：US20230070437A1
公开(公告)日：2023-03-09
申请号：US17524740
申请日：2021-11-11
Inventor： Jinghui Di , Qifeng Wei , Shujun Shen , Shengli Jia , Lichun Zhan , Pengfei Ge
Abstract: The present application relates to a preparation method of neodymium iron boron products and the neodymium iron boron product prepared by using the same. The preparation method of neodymium iron boron products includes the following steps: Step S1: preparing blank magnet; Step S2: obtaining preprocessed sheets; Step S3: surface treating; Step S4: heavy rare earth coating; Step S5: stacking: stacking a plurality of preprocessed sheets to give stacked magnets; and Step S6: grain boundary diffusion: successively subjecting the stacked magnets to a primary heat treatment for 2-40 min, a secondary heat treatment at 700-1000° C. for 4-40 h, and then tempering at 450-700° C., in which the primary heat treatment is induction heat treatment or electric spark sintering.
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