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    IRON-NITRIDE MAGNET BY NITRIDING A POROUS STRUCTURE
    12.
    发明申请
    IRON-NITRIDE MAGNET BY NITRIDING A POROUS STRUCTURE 有权

    公开(公告)号：US20210202142A1

    公开(公告)日：2021-07-01

    申请号：US17058882

    申请日：2019-05-28

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping WANG ,  Jinming LIU ,  Bin MA ,  Fan ZHANG ,  Guannan GUO ,  Yiming WU ,  Xiaowei ZHANG

    IPC: H01F1/047 ,  H01F41/02 ,  C23C8/26 ,  C23C8/02 ,  C01B21/06

    Abstract: In general, the disclosure is directed to bulk iron-nitride materials having a polycrystalline microstructure having pores including a plurality of crystallographic grains surrounded by grain boundaries, where at least one crystallographic grain includes an iron-nitride phase including any of a body centered cubic (bcc) structure, a body centered tetragonal (bct), and a martensite structure. The disclosure further describes techniques producing a bulk iron-nitride material having a polycrystalline microstructure, including: melting an iron source to obtain a molten iron source; fast belt casting the molten iron source to obtain a cast iron source; cooling and shaping the cast iron source to obtain a bulk iron-containing material having a body-centered cubic (bcc) structure; annealing the bulk iron-containing material at an austenite transformation temperature and subsequently cooling the bulk iron-containing material; and nitriding the bulk iron-containing material to obtain the bulk iron-nitride material.

    IRON-RICH PERMANENT MAGNET
    13.
    发明申请
    IRON-RICH PERMANENT MAGNET 审中-公开

    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

    IPC: H01F41/02 ,  H01F1/10 ,  C01B21/06

    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.

    IRON-RICH PERMANENT MAGNET
    16.
    发明公开
    IRON-RICH PERMANENT MAGNET 审中-公开

    公开(公告)号：US20240112855A1

    公开(公告)日：2024-04-04

    申请号：US18529331

    申请日：2023-12-05

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping WANG ,  Md MEHEDI ,  YanFeng JIANG ,  Bin MA ,  Delin ZHANG ,  Fan ZHANG ,  Jinming LIU

    IPC: H01F41/02 ,  C01B21/06 ,  H01F1/10

    CPC classification number: H01F41/0253 ,  C01B21/0622 ,  H01F1/10 ,  H01F1/03

    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.

    IRON-BASED NANOPARTICLES AND GRAINS
    19.
    发明申请
    IRON-BASED NANOPARTICLES AND GRAINS 审中-公开

    公开(公告)号：US20200038951A1

    公开(公告)日：2020-02-06

    申请号：US16340031

    申请日：2017-10-06

    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA

    Inventor： Jian-Ping WANG ,  Bin MA ,  Jinming LIU ,  Yiming WU ,  YanFeng JIANG

    IPC: B22F1/02 ,  H01F1/059 ,  H01F1/055 ,  B22F1/00 ,  B22F9/04 ,  C23C8/50 ,  C23C8/26 ,  C23C8/80

    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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