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公开(公告)号：US11897034B2
公开(公告)日：2024-02-13
申请号：US16975838
申请日：2018-09-13
Applicant: STAR GROUP IND. CO., LTD
Inventor： Dong Hwan Kim , Koon Seung Kong
CPC classification number: B22F3/16 , B22F3/24 , B22F9/04 , C22C28/00 , H01F1/0571 , H01F41/0266 , B22F2003/248 , B22F2009/044 , B22F2202/05 , B22F2301/45 , C22C2202/02
Abstract: There is provided a method for manufacturing a rare earth sintered magnet by many times repetitively finely pulverizing a rare earth alloy on a jet mill by supplying high-pressure nitrogen gas to narrow grain size distribution to make an easy alignment in a magnetic field, and by micronizing crystal grains by using a hydrogenation-disproportionation-desorption-recombination (HDDR) process, to improve the coercivity and thermostability of the rare earth sintered magnet.
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公开(公告)号：US20210319935A1
公开(公告)日：2021-10-14
申请号：US16951729
申请日：2020-11-18
Applicant: Hyundai Motor Company , Kia Motors Corporation , Star Group Ind. Co. LTD
Inventor： Do Hoon Kim , Hyung Ju Lee , Jae Hyuk Jang , Young Beom Kim , Dong Hwan Kim , Koon Seung Kong
Abstract: Disclosed are a rare-earth permanent magnet having improved magnetic properties and a method of manufacturing the same.
A method of manufacturing a rare-earth permanent magnet may include: preparing a mixed powder including i) a first alloy represented by R1aR2bBcMdFebal and ii) a second alloy represented by R2bBcMdFebal where R1 is one or two or more of La, Ce, and Y; R2 is a rare-earth element except for La, Ce, and Y; and M is a metal element; press-forming and sintering the prepared mixed powder in a magnetic field to prepare a sintered body; and performing a heat treatment based on diffusion temperature conditions of an R1 component and an R2 component contained in the prepared sintered body.-
公开(公告)号：US11915861B2
公开(公告)日：2024-02-27
申请号：US16975886
申请日：2018-09-13
Applicant: STAR GROUP IND. CO., LTD
Inventor： Dong Hwan Kim , Koon Seung Kong
CPC classification number: H01F41/0293 , B22F3/16 , B22F3/24 , B22F9/04 , C22C38/005 , B22F2003/248 , B22F2009/044 , B22F2201/10 , B22F2201/20 , B22F2202/05 , B22F2301/355 , B22F2304/10 , C22C2202/02 , H02K1/02
Abstract: There is provided a method for manufacturing a rare earth sintered magnet having a stable magnetic performance, by uniformly distributing a heavy rear earth element to the surface of the magnet and the grain boundary inside of the magnet by using a mixture of a heavy rare earth compound or a heavy rare earth metal alloy and a rare earth magnet powder, to lower a decrease rate of the magnetic characteristics based on the temperature of the rare earth sintered magnet.
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公开(公告)号：US11682506B2
公开(公告)日：2023-06-20
申请号：US16951729
申请日：2020-11-18
Applicant: Hyundai Motor Company , Kia Motors Corporation , Star Group Ind. Co. LTD
Inventor： Do Hoon Kim , Hyung Ju Lee , Jae Hyuk Jang , Young Beom Kim , Dong Hwan Kim , Koon Seung Kong
CPC classification number: H01F1/0577 , B22F3/10 , B22F3/24 , B22F9/04 , C22C38/002 , C22C38/005 , H01F41/0266 , B22F2009/044 , B22F2301/355 , C22C2202/02
Abstract: Disclosed are a rare-earth permanent magnet having improved magnetic properties and a method of manufacturing the same.
A method of manufacturing a rare-earth permanent magnet may include: preparing a mixed powder including i) a first alloy represented by R1aR2bBcMdFebal and ii) a second alloy represented by R2bBcMdFebal where R1 is one or two or more of La, Ce, and Y; R2 is a rare-earth element except for La, Ce, and Y; and M is a metal element; press-forming and sintering the prepared mixed powder in a magnetic field to prepare a sintered body; and performing a heat treatment based on diffusion temperature conditions of an R1 component and an R2 component contained in the prepared sintered body.-
Patent Agency Ranking
公开(公告)号：US20220344082A1
公开(公告)日：2022-10-27
申请号：US17451721
申请日：2021-10-21
Applicant: Hyundai Motor Company , Kia Corporation , Star Group Ind. Co., Ltd.
Inventor： Seok Jin Ha , Sang Hwa Do , Kyoung Bum Kim , Nyeon Han Hong , Koon Seung Kong , Dong Hwan Kim , Sang Hyub Lee
Abstract: Disclosed is a segmented magnet which may adjust the application direction of a heavy rare earth element for grain boundary diffusion depending on the magnetization direction of the segmented magnet so as to simplify the manufacturing process of the segmented magnet while reducing eddy current loss, and a method for manufacturing the same. The method includes preparing a plurality of permanent magnet parent bodies having a constant magnetization direction, diffusing a diffusion material into the prepared permanent magnet parent bodies via a pair of planes thereof opposite each other and parallel to the magnetization direction along grain boundaries so as to form a pair of diffusing surfaces, preparing a permanent magnet assembly by stacking the permanent magnet parent bodies in a line such that the diffusing surfaces thereof face each other, and segmenting the permanent magnet assembly into a plurality of pieces along planes perpendicular to the magnetization direction.
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公开(公告)号：US11527356B2
公开(公告)日：2022-12-13
申请号：US16441251
申请日：2019-06-14
Applicant: Star group Ind. Co., Ltd.
Inventor： Koon Seung Kong , Dong Hwan Kim
Abstract: A method for producing a heavy rare earth grain-boundary-diffused RE-Fe—B-based rare earth magnet and a heavy rare earth grain-boundary-diffused RE-Fe—B-based rare earth magnet produced thereby is disclosed. More particularly, a method for producing a heavy rare earth grain-boundary-diffused RE-Fe—B-based rare earth sintered magnet having a reduced content of a heavy rare earth element is disclosed, in which a hydrogen compound of a heavy rare earth is mainly used as a diffusion material in the production of the grain-boundary-diffused magnet so that a product having uniform and stable quality can be produced. The coercive force of the magnet can be increased while minimizing the amount of heavy rare earth used in the production of the grain-boundary-diffused magnet, by solving the problem that the heavy rare earth is not uniformly diffused into the magnet, and a heavy rare earth grain-boundary-diffused RE-Fe—B-based rare earth magnet produced thereby.
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公开(公告)号：US12205737B2
公开(公告)日：2025-01-21
申请号：US16975594
申请日：2018-09-13
Applicant: STAR GROUP IND. CO., LTD
Inventor： Dong Hwan Kim , Koon Seung Kong
Abstract: There is provided a method for manufacturing a rare earth sintered magnet to improve the high temperature demagnetization characteristic of the rare earth permanent magnet, by diffusing a heavy rare earth element to the grain boundary of a sintered magnet to improve the magnetic characteristics based on temperature.
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公开(公告)号：US20240006099A1
公开(公告)日：2024-01-04
申请号：US18140853
申请日：2023-09-22
Applicant: Hyundai Motor Company , Kia Corporation , Star Group Ind. Co. Ltd.
Inventor： Do Hoon KIM , Hyung Ju Lee , Jae Hyuk Jang , Young Beom Kim , Dong Hwan Kim , Koon Seung Kong
CPC classification number: H01F1/0577 , H01F41/0266 , B22F3/10 , B22F3/24 , C22C38/005 , C22C38/002 , B22F9/04 , B22F2009/044 , C22C2202/02 , B22F2301/355
Abstract: Disclosed are a rare-earth permanent magnet having improved magnetic properties and a method of manufacturing the same.
A method of manufacturing a rare-earth permanent magnet may include: preparing a mixed powder including i) a first alloy represented by R1aR2bBcMdFebal and ii) a second alloy represented by R2bBcMdFebal where R1 is one or two or more of La, Ce, and Y; R2 is a rare-earth element except for La, Ce, and Y; and M is a metal element; press-forming and sintering the prepared mixed powder in a magnetic field to prepare a sintered body; and performing a heat treatment based on diffusion temperature conditions of an R1 component and an R2 component contained in the prepared sintered body.-
公开(公告)号：US11222738B2
公开(公告)日：2022-01-11
申请号：US16099461
申请日：2016-06-10
Applicant: STAR GROUP IND. CO., LTD
Inventor： Dong Hwan Kim , Koon Seung Kong
Abstract: The present invention provides a method for manufacturing a rare-earth magnet, the method comprising the steps of preparing a rare-earth magnet raw material powder including R, Fe and B as composition components (R is one or more elements selected from the rare earth elements including Y and Sc); packing the raw material powder into a molding die, and compacting and molding the raw material powder while applying a magnetic field, wherein, in the compacting and molding step, compacting is performed biaxially, in the directions of X and Y axes, when the magnetic field is applied in the direction of Z axis.
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