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公开(公告)号：US20240290539A1
公开(公告)日：2024-08-29
申请号：US18642092
申请日：2024-04-22
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG
CPC classification number: H01F41/0273 , B22D27/02 , C22C38/001 , H01F1/047 , H01F1/06 , H01F1/08 , H01F41/0266 , H02K1/02
Abstract: Techniques are disclosed concerning applied magnetic field synthesis and processing of iron nitride magnetic materials. Some methods concern casting a material including iron in the presence of an applied magnetic field to form a workpiece including at least one iron-based phase domain including uniaxial magnetic anisotropy, wherein the applied magnetic field has a strength of at least about 0.01 Tesla (T). Also disclosed are workpieces made by such methods, apparatus for making such workpieces and bulk materials made by such methods.
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公开(公告)号：US20220093296A1
公开(公告)日：2022-03-24
申请号：US17543863
申请日：2021-12-07
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG
IPC: H01F1/047 , H01F1/00 , H01F41/02 , C22C38/00 , C23C8/60 , C23C8/02 , C23C8/80 , C23C8/24 , C23C8/18 , C23C8/26
Abstract: A permanent magnet may include a Fe16N2 phase in a strained state. In some examples, strain may be preserved within the permanent magnet by a technique that includes etching an iron nitride-containing workpiece including Fe16N2 to introduce texture, straining the workpiece, and annealing the workpiece. In some examples, strain may be preserved within the permanent magnet by a technique that includes applying at a first temperature a layer of material to an iron nitride-containing workpiece including Fe16N2, and bringing the layer of material and the iron nitride-containing workpiece to a second temperature, where the material has a different coefficient of thermal expansion than the iron nitride-containing workpiece. A permanent magnet including an Fe16N2 phase with preserved strain also is disclosed.
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公开(公告)号：US20240076764A1
公开(公告)日：2024-03-07
申请号：US18506394
申请日：2023-11-10
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG , Md MEHEDI , Yiming WU , Bin MA , Jinming LIU , Delin ZHANG
CPC classification number: C22C38/001 , C22C33/006 , H01F1/11 , H01F7/021 , H01F41/0253 , C22C2200/04 , C22C2202/02
Abstract: All example composition may include a plurality of grains including an iron nitride phase. The plurality of grains may have an average wain size between about 10 nm and about 200 nm. An example technique may include treating a composition including a plurality of grains including au iron-based phase to adjust an average grain size of the plurality of grains to between about 20 nm and about 100 ma. The example technique may include nitriding the plurality of grains to form or grow an iron nitride phase.
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公开(公告)号：US20230024845A1
公开(公告)日：2023-01-26
申请号：US17945203
申请日：2022-09-15
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG
Abstract: Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one α″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one α″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.
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公开(公告)号：US20210265111A1
公开(公告)日：2021-08-26
申请号：US17245641
申请日：2021-04-30
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG
Abstract: Techniques are disclosed concerning applied magnetic field synthesis and processing of iron nitride magnetic materials. Some methods concern casting a material including iron in the presence of an applied magnetic field to form a workpiece including at least one iron-based phase domain including uniaxial magnetic anisotropy, wherein the applied magnetic field has a strength of at least about 0.01 Tesla (T). Also disclosed are workpieces made by such methods, apparatus for making such workpieces and bulk materials made by such methods.
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Patent Agency Ranking
公开(公告)号：US20200027654A1
公开(公告)日：2020-01-23
申请号：US16423516
申请日：2019-05-28
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , Md MEHEDI , YanFeng JIANG , Bin MA , Delin ZHANG , Fan ZHANG , Jinming LIU
Abstract: The disclosure is directed to an iron-nitride material having a polycrystalline microstructure including a plurality of elongated crystallographic grains with grain boundaries, the iron-nitride material including at least one of an α″-Fe16N2 phase and a body-center-tetragonal (bct) phase comprising Fe and N. The disclosure is also directed a method producing an iron-nitride material. The method includes some combinations of preparing a raw material comprising iron, carrying out a microstructure build-up by annealing the prepared raw material at an elevated temperature and subsequently quenching the prepared raw material to produce a microstructure build-up material, annealing the microstructure build-up material, reducing the microstructure build-up material in a hydrogen environment, nitriding the reduced material to produce a nitrided material and subsequently quenching the nitrided material to a martensitic transformation temperature, stress annealing the nitrided material, and magnetic field annealing the stress-annealed material.
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公开(公告)号：US20180001385A1
公开(公告)日：2018-01-04
申请号：US15546359
申请日：2016-01-22
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG
CPC classification number: B22F9/04 , B22F1/0018 , B22F2001/0033 , B22F2009/045 , B22F2998/10 , B22F2999/00 , C22C33/02 , C23C8/26 , H01F1/065 , H01F1/083 , H01F1/086 , H01F41/0266 , B22F1/0088 , B22F2009/042 , B22F2201/02 , B22F2201/016 , B22F2201/11 , B22F2201/50 , B22F2202/03 , B22F2202/05 , B22F9/20
Abstract: Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one a″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one a″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.
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公开(公告)号：US20240055165A1
公开(公告)日：2024-02-15
申请号：US18494838
申请日：2023-10-26
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , Bin MA , Jinming LIU , Yiming WU , YanFeng JIANG
IPC: H01F1/06 , B22F9/04 , C23C8/26 , C23C8/50 , C23C8/80 , H01F1/055 , H01F1/059 , C22C38/00 , C22C38/10 , B22F1/16 , B22F1/054
CPC classification number: H01F1/065 , B22F9/04 , C23C8/26 , C23C8/50 , C23C8/80 , H01F1/0551 , H01F1/059 , C22C38/00 , C22C38/001 , C22C38/10 , B22F1/16 , B22F1/054 , H01F1/061 , B22F1/0553 , B22F2301/35 , B22F2302/20 , B22F2304/054 , H01F1/0552 , B22F1/0547
Abstract: Example nanoparticles may include an iron-based core, and a shell. The shell may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example alloy compositions may include an iron-based grain, and a grain boundary. The grain boundary may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example techniques for forming iron-based core-shell nanoparticles may include depositing a shell on an iron-based core. The depositing may include immersing the iron-based core in a salt composition for a predetermined period of time. The depositing may include milling the iron-based core with a salt composition for a predetermined period of time. Example techniques for treating a composition comprising core-shell nanoparticles may include nitriding the composition.
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公开(公告)号：US20220098711A1
公开(公告)日：2022-03-31
申请号：US16610285
申请日：2018-05-04
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , YanFeng JIANG , Md MEHEDI , Yiming WU , Bin MA , Jinming LIU , Delin ZHANG
Abstract: An example composition may include a plurality of grains including an iron nitride phase. The plurality of grains may have an average grain size between about 10 nm and about 200 nm. An example technique may include treating a composition including a plurality of grains including an iron-based phase to adjust an average grain size of the plurality of grains to between about 20 nm and about 100 nm. The example technique may include nitriding the plurality of grains to form or grow an iron nitride phase.
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公开(公告)号：US20220080500A1
公开(公告)日：2022-03-17
申请号：US17490800
申请日：2021-09-30
Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventor： Jian-Ping WANG , Bin MA , Jinming LIU , Yiming WU , YanFeng JIANG
IPC: B22F1/02 , B22F1/00 , B22F9/04 , C23C8/26 , C23C8/50 , C23C8/80 , H01F1/055 , H01F1/059 , C22C38/00 , C22C38/10
Abstract: Example nanoparticles may include an iron-based core, and a shell. The shell may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example alloy compositions may include an iron-based grain, and a grain boundary. The grain boundary may include a non-magnetic, anti-ferromagnetic, or ferrimagnetic material. Example techniques for forming iron-based core-shell nanoparticles may include depositing a shell on an iron-based core. The depositing may include immersing the iron-based core in a salt composition for a predetermined period of time. The depositing may include milling the iron-based core with a salt composition for a predetermined period of time. Example techniques for treating a composition comprising core-shell nanoparticles may include nitriding the composition.
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