Patents by Inventor Koon Seung KONG
Koon Seung KONG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11915861Abstract: 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.Type: GrantFiled: September 13, 2018Date of Patent: February 27, 2024Assignee: STAR GROUP IND. CO., LTDInventors: Dong Hwan Kim, Koon Seung Kong
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Patent number: 11897034Abstract: 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.Type: GrantFiled: September 13, 2018Date of Patent: February 13, 2024Inventors: Dong Hwan Kim, Koon Seung Kong
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Publication number: 20240006099Abstract: 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.Type: ApplicationFiled: September 22, 2023Publication date: January 4, 2024Inventors: Do Hoon KIM, Hyung Ju Lee, Jae Hyuk Jang, Young Beom Kim, Dong Hwan Kim, Koon Seung Kong
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Patent number: 11682506Abstract: 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.Type: GrantFiled: November 18, 2020Date of Patent: June 20, 2023Assignees: Hyundai Motor Company, Kia Motors Corporation, Star Group Ind. Co. Ltd.Inventors: Do Hoon Kim, Hyung Ju Lee, Jae Hyuk Jang, Young Beom Kim, Dong Hwan Kim, Koon Seung Kong
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Patent number: 11527356Abstract: 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.Type: GrantFiled: June 14, 2019Date of Patent: December 13, 2022Assignee: STAR GROUP IND. CO., LTD.Inventors: Koon Seung Kong, Dong Hwan Kim
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Publication number: 20220344082Abstract: 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.Type: ApplicationFiled: October 21, 2021Publication date: October 27, 2022Inventors: Seok Jin Ha, Sang Hwa Do, Kyoung Bum Kim, Nyeon Han Hong, Koon Seung Kong, Dong Hwan Kim, Sang Hyub Lee
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Patent number: 11222738Abstract: 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.Type: GrantFiled: June 10, 2016Date of Patent: January 11, 2022Assignee: STAR GROUP IND. CO., LTDInventors: Dong Hwan Kim, Koon Seung Kong
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Publication number: 20210335540Abstract: Disclosed are a method of manufacturing a rare-earth permanent magnet capable of offsetting a partially uneven demagnetization by varying the amount of heavy rare-earth element diffused to a grain boundary for each region and a Nd—Fe—B-based permanent magnet manufactured by the same. The method includes: preparing a base material including a plurality of regions by using a sintered magnet including an Nd—Fe—B-based alloy; preparing a coating material including a heavy rare-earth element; applying the coating material to a surface of the base material; and diffusing the heavy rare-earth element to a grain boundary of the base material by heat-treating the base material to which the coating material is applied. In the applying the coating material, an amount of the coating material applied to each region of the base material may vary.Type: ApplicationFiled: November 9, 2020Publication date: October 28, 2021Applicants: Hyundai Motor Company, Kia Motors Corporation, Kia Motors CorporationInventors: Bo Kyeong Han, Dong Hwan Kim, Koon Seung Kong
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Publication number: 20210319935Abstract: 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.Type: ApplicationFiled: November 18, 2020Publication date: October 14, 2021Inventors: Do Hoon Kim, Hyung Ju Lee, Jae Hyuk Jang, Young Beom Kim, Dong Hwan Kim, Koon Seung Kong
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Publication number: 20210005380Abstract: 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.Type: ApplicationFiled: September 13, 2018Publication date: January 7, 2021Inventors: Dong Hwan KIM, Koon Seung KONG
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Publication number: 20200406361Abstract: 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.Type: ApplicationFiled: September 13, 2018Publication date: December 31, 2020Inventors: Dong Hwan KIM, Koon Seung KONG
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Publication number: 20200395153Abstract: 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.Type: ApplicationFiled: September 13, 2018Publication date: December 17, 2020Inventors: Dong Hwan KIM, Koon Seung KONG
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Publication number: 20190385790Abstract: Disclosed is 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, and more particularly to 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, 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, and 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.Type: ApplicationFiled: June 14, 2019Publication date: December 19, 2019Applicant: Star group Ind. Co., Ltd.Inventors: Koon Seung KONG, Dong Hwan KIM
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Patent number: 10490326Abstract: Disclosed is a method of producing a rare earth permanent magnet including preparing a NdFeB sintered magnet, coating a surface of the NdFeB sintered magnet with a grain boundary diffusion material including R hydrate or R fluoride, and RaMb or M, to form a grain boundary diffusion coating layer, and diffusing the grain boundary diffusion material into a grain boundary of the NdFeB sintered magnet by heat treatment, wherein M is a metal having a melting point higher than a heat treatment temperature during the diffusion, R is a rare earth element, and a and b each represent atomic percentages which satisfy the following Equations (1) and (2): 0.1<a<99.9??(1) a+b=100??(2).Type: GrantFiled: November 2, 2017Date of Patent: November 26, 2019Assignees: Hyundai Motor Company, Kia Motors Corporation, Star Group Ind. Co., Ltd.Inventors: Jae Ryung Lee, Dong Hwan Kim, Koon Seung Kong
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Publication number: 20190198209Abstract: 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.Type: ApplicationFiled: June 10, 2016Publication date: June 27, 2019Inventors: Dong Hwan KIM, Koon Seung KONG
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Publication number: 20190139686Abstract: Provided is a method for manufacturing a rare-earth magnet, the method comprising the steps of preparing a rare-earth magnet powder including R, Fe and B as composition components, wherein, R is at least one element selected from among the rare earth elements including Y and Sc; mixing a heavy rare-earth compound including a heavy rare-earth hydride with the rare-earth magnet powder; molding the powder mixture in a magnetic-field; and sintering and performing heavy rare-earth diffusion at the same time.Type: ApplicationFiled: June 10, 2016Publication date: May 9, 2019Inventors: Dong Hwan KIM, Young Chul PARK, Koon Seung KONG
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Publication number: 20180166192Abstract: Disclosed is a method of producing a rare earth permanent magnet including preparing a NdFeB sintered magnet, coating a surface of the NdFeB sintered magnet with a grain boundary diffusion material including R hydrate or R fluoride, and RaMb or M, to form a grain boundary diffusion coating layer, and diffusing the grain boundary diffusion material into a grain boundary of the NdFeB sintered magnet by heat treatment, wherein M is a metal having a melting point higher than a heat treatment temperature during the diffusion, R is a rare earth element, and a and b each represent atomic percentages which satisfy the following Equations (1) and (2): 0.1<a<99.Type: ApplicationFiled: November 2, 2017Publication date: June 14, 2018Applicants: Hyundai Motor Company, Kia Motors Corporation, Star Group Ind. Co., Ltd.Inventors: Jae Ryung Lee, Dong Hwan KIM, Koon Seung KONG