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公开(公告)号：US20190105708A1
公开(公告)日：2019-04-11
申请号：US16087868
申请日：2017-03-24
Inventor： Nobuyoshi Imaoka , Kimihiro Ozaki
IPC: B22F1/00 , B22F3/24 , C22C22/00 , C22C33/02 , C22C38/04 , H01F1/147 , H01F1/22 , H01F1/33 , H01F1/34
Abstract: Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.
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公开(公告)号：US11921061B2
公开(公告)日：2024-03-05
申请号：US17638434
申请日：2020-08-11
Inventor： Rikio Soda , Kimihiro Ozaki
IPC: G01N23/2055
CPC classification number: G01N23/2055
Abstract: An orientation degree distribution analysis method includes steps of: inputting, to a main storage device, crystal structure information of an object to be measured, information on an intensity ratio of each diffraction peak and a crystal plane corresponding to each diffraction peak by X-ray diffraction measurement, information on a diffraction range and a diffraction sensitivity, and information on an intensity ratio of each diffraction peak of a randomly oriented sample; calculating an angle defined by an orientation plane and a crystal plane corresponding to a diffraction peak of interest from the information stored in the main storage device; calculating an existence ratio and storing the existence ratio in the main storage device; setting an orientation degree distribution function; and calculating an orientation degree distribution from the information of the inputting step and the information of the calculating step.
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公开(公告)号：US11331721B2
公开(公告)日：2022-05-17
申请号：US16488396
申请日：2018-02-23
Inventor： Shinpei Yamamoto , Nobuyoshi Imaoka , Kimihiro Ozaki
Abstract: Provided are a new, highly magnetically stable magnetic material which has higher saturation magnetization than ferrite-based magnetic materials, and with which problems of eddy current loss and the like can be solved due to higher electric resistivity than that of existing metal-based magnetic materials, and a method for manufacturing the same. A magnetic material powder is obtained by reducing in hydrogen Ni-ferrite nanoparticies obtained by wet synthesis and causing grain growth, while simultaneously causing nanodispersion of an α-(Fe, Ni) phase and an Ni-enriched phase by means of a phase dissociation phenomenon due to disproportional reaction. The powder is sintered to obtain a solid magnetic material.
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公开(公告)号：US11033958B2
公开(公告)日：2021-06-15
申请号：US16087868
申请日：2017-03-24
Inventor： Nobuyoshi Imaoka , Kimihiro Ozaki
IPC: B22F1/00 , B22F3/24 , C22C22/00 , C22C33/02 , C22C38/04 , H01F1/147 , H01F1/22 , H01F1/33 , H01F1/34 , C22C38/00 , H01F1/20
Abstract: Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Mn-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Mn) phase and a Mn-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.
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公开(公告)号：US12030122B2
公开(公告)日：2024-07-09
申请号：US17075693
申请日：2020-10-21
Applicant: JFE STEEL CORPORATION , TOKIN CORPORATION , National Institute of Advanced Industrial Science and Technology
Inventor： Naomichi Nakamura , Makoto Nakaseko , Takuya Takashita , Mineo Muraki , Hoshiaki Terao , Raita Wada , Akiri Urata , Yu Kanamori , Makoto Yamaki , Koichi Okamoto , Toshinori Tsuda , Shoichi Sato , Kimihiro Ozaki
IPC: B22F3/14 , B22F1/00 , B22F1/02 , B22F1/08 , B22F1/102 , B22F1/16 , B22F3/00 , B22F3/02 , B22F3/03 , C22C33/02 , C22C38/00 , C22C38/02 , C22C38/16 , C22C45/02 , H01F1/153 , H01F3/08 , H01F41/02 , H01F27/255
CPC classification number: B22F3/14 , B22F1/00 , B22F1/08 , B22F1/102 , B22F1/16 , B22F3/00 , B22F3/02 , B22F3/03 , C22C33/02 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/16 , C22C45/02 , H01F1/15308 , H01F1/15325 , H01F1/15333 , H01F1/15375 , H01F3/08 , H01F41/0246 , B22F2301/35 , B22F2304/10 , C22C2200/02 , C22C2200/04 , C22C2202/02 , H01F27/255
Abstract: Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tx1 and a second initial crystallization temperature Tx2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than Tx1−100 K; and heating to a maximum end-point temperature equal to or higher than Tx1−50 K and lower than Tx2 with the compacting pressure being applied.
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Patent Agency Ranking
公开(公告)号：US11459646B2
公开(公告)日：2022-10-04
申请号：US16648836
申请日：2018-09-20
Inventor： Nobuyoshi Imaoka , Shinpei Yamamoto , Kimihiro Ozaki
IPC: C22C38/16 , C22C38/10 , C22C38/08 , C22C38/04 , C22C38/02 , B22F1/00 , B22F9/22 , H01F1/34 , H01F1/36 , B22F1/05 , H01F1/055 , H01F1/22
Abstract: The purpose of the present invention is to provide: a new magnetic material which exhibits high magnetic stability and excellent oxidation resistance and which can achieve both significantly higher saturation magnetization and lower coercive force than a conventional ferrite-based magnetic material by using a magnetic material obtained by nanodispersing α-(Fe,M) phases and M component-enriched phases (here, the M component is at least one component selected from among Zr, Hf, V, Nb, Ta, Cr, Mo, W, Cu, Zn and Si); and a method for producing same. This magnetic material powder exhibits high moldability, and is such that α-(Fe, M) phases and M-enriched phases are nanodispersed by chemically reducing M-ferrite nanoparticles, which are obtained by means of wet synthesis, in hydrogen and utilizing phase separation by means of a disproportionation reaction while simultaneously carrying out grain growth. Furthermore, a solid magnetic material is obtained by sintering this powder.
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公开(公告)号：US20200265976A1
公开(公告)日：2020-08-20
申请号：US16648269
申请日：2018-09-20
Inventor： Shinpei Yamamoto , Nobuyoshi Imaoka , Kimihiro Ozaki
Abstract: Provided are: a novel magnetic material having high magnetic stability, in particular, having an extremely high saturation magnetization; and a method for producing the same, wherein the magnetic material, due to having a higher saturation magnetization than ferrite magnetic materials and a higher electrical resistivity than existing metallic magnetic materials, resolves problems such as eddy current loss. According to the present invention, Co-ferrite nanoparticles obtained by wet synthesis are reduced in hydrogen and subjected to grain growth, and bcc- or fcc-(Fe, Co) phases and Co-enriched phases are nano-dispersed using phase separation via a disproportionation reaction to prepare a magnetic material powder. In addition, the magnetic material powder is sintered into a solid magnetic material.
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公开(公告)号：US11732336B2
公开(公告)日：2023-08-22
申请号：US16648269
申请日：2018-09-20
Inventor： Shinpei Yamamoto , Nobuyoshi Imaoka , Kimihiro Ozaki
CPC classification number: C22C33/02 , B22F1/00 , B22F3/00 , H01F1/065 , H01F1/14741 , H01F1/14775 , H01F1/15316 , H01F1/33
Abstract: Provided are: a novel magnetic material having high magnetic stability, in particular, having an extremely high saturation magnetization; and a method for producing the same, wherein the magnetic material, due to having a higher saturation magnetization than ferrite magnetic materials and a higher electrical resistivity than existing metallic magnetic materials, resolves problems such as eddy current loss. According to the present invention, Co-ferrite nanoparticles obtained by wet synthesis are reduced in hydrogen and subjected to grain growth, and bcc- or fcc-(Fe, Co) phases and Co-enriched phases are nano-dispersed using phase separation via a disproportionation reaction to prepare a magnetic material powder. In addition, the magnetic material powder is sintered into a solid magnetic material.
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公开(公告)号：US10978228B2
公开(公告)日：2021-04-13
申请号：US16087854
申请日：2017-03-24
Inventor： Nobuyoshi Imaoka , Kimihiro Ozaki
IPC: H01F1/147 , H01F41/02 , B22F9/22 , C22C14/00 , C22C38/00 , H01F1/33 , B22F3/00 , H01F1/22 , B22F1/00 , H01F1/34 , H01F1/20 , B22F1/02 , C22C32/00 , H01F1/26 , H01F1/36
Abstract: Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Ti-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an α-(Fe, Ti) phase and a Ti-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.
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公开(公告)号：US20200248288A1
公开(公告)日：2020-08-06
申请号：US16648836
申请日：2018-09-20
Inventor： Nobuyoshi Imaoka , Shinpei Yamamoto , Kimihiro Ozaki
IPC: C22C38/16 , C22C38/10 , C22C38/08 , C22C38/04 , C22C38/02 , B22F1/00 , B22F9/22 , H01F1/34 , H01F1/36
Abstract: The purpose of the present invention is to provide: a new magnetic material which exhibits high magnetic stability and excellent oxidation resistance and which can achieve both significantly higher saturation magnetization and lower coercive force than a conventional ferrite-based magnetic material by using a magnetic material obtained by nanodispersing α-(Fe,M) phases and M component-enriched phases (here, the M component is at least one component selected from among Zr, Hf, V, Nb, Ta, Cr, Mo, W, Cu, Zn and Si); and a method for producing same. This magnetic material powder exhibits high moldability, and is such that α-(Fe, M) phases and M-enriched phases are nanodispersed by chemically reducing M-ferrite nanoparticles, which are obtained by means of wet synthesis, in hydrogen and utilizing phase separation by means of a disproportionation reaction while simultaneously carrying out grain growth. Furthermore, a solid magnetic material is obtained by sintering this powder.
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