公开(公告)号：US11875934B2

公开(公告)日：2024-01-16

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: C01B21/06 ,  H01F1/10 ,  C22C38/00 ,  H01F41/02 ,  H01F1/03 ,  C22C38/06 ,  H01F1/00 ,  C22C38/16

CPC classification number: H01F41/0253 ,  C01B21/0622 ,  H01F1/10 ,  C21D2201/05 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/06 ,  C22C38/16 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/0009 ,  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.

公开(公告)号：US12014853B2

公开(公告)日：2024-06-18

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: H01F1/04 ,  C01B21/06 ,  C23C8/02 ,  C23C8/26 ,  H01F1/047 ,  H01F41/02

CPC classification number: H01F1/047 ,  C01B21/0622 ,  C23C8/02 ,  C23C8/26 ,  H01F41/0253 ,  C01P2002/60 ,  C01P2002/72 ,  C01P2002/77 ,  C01P2004/02 ,  C01P2004/03 ,  C01P2004/04 ,  C01P2006/42

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.

公开(公告)号：US11859271B2

公开(公告)日：2024-01-02

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

IPC: C22C38/00 ,  C22C33/00 ,  H01F1/11 ,  H01F7/02 ,  H01F41/02

CPC classification number: C22C38/001 ,  C22C33/006 ,  H01F1/11 ,  H01F7/021 ,  H01F41/0253 ,  C22C2200/04 ,  C22C2202/02

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.

公开(公告)号：US11837393B2

公开(公告)日：2023-12-05

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: H01F1/06 ,  C22C38/00 ,  B22F1/16 ,  B22F1/054 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/055 ,  H01F1/059 ,  C22C38/10 ,  B22F1/06

CPC classification number: H01F1/065 ,  B22F1/054 ,  B22F1/0553 ,  B22F1/06 ,  B22F9/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/10 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  H01F1/059 ,  H01F1/0551 ,  H01F1/061 ,  B22F1/0547 ,  B22F2301/35 ,  B22F2302/20 ,  B22F2304/054 ,  H01F1/0552

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.

公开(公告)号：US11161175B2

公开(公告)日：2021-11-02

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 ,  B22F1/00 ,  H01F1/055 ,  H01F1/059 ,  B22F9/04 ,  C23C8/26 ,  C23C8/50 ,  C23C8/80 ,  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.

公开(公告)号：US12018386B2

公开(公告)日：2024-06-25

申请号：US16949038

申请日：2020-10-09

Applicant: Regents of the University of Minnesota

Inventor： Jian-Ping Wang ,  Bin Ma ,  Guannan Guo

IPC: H01F1/147 ,  B22D23/00 ,  C22C38/00 ,  C23C8/34 ,  C23C8/80

CPC classification number: C23C8/34 ,  B22D23/00 ,  C22C38/001 ,  C23C8/80 ,  H01F1/147

Abstract: The disclosure describes a method that includes forming a soft magnetic material by a technique including melt spinning. The soft magnetic material includes at least one of: at least one of an α″-Fe16(NxZ1-x)2 phase domain or an α′-Fe8(NxZ1-x), where Z includes at least one of C, B, or O, and where x is a number greater than zero and less than one; or at least one of an α″-Fe16N2 phase domain or an α′-Fe8N phase domain, and at least one of an α″-Fe16Z2 phase domain or an α′-Fe8Z phase domain.

公开(公告)号：US20210123126A1

公开(公告)日：2021-04-29

申请号：US16949038

申请日：2020-10-09

Applicant: Regents of the University of Minnesota

Inventor： Jian-Ping Wang ,  Bin Ma ,  Guannan Guo

IPC: C23C8/34 ,  B22D23/00 ,  C23C8/80 ,  C22C38/00 ,  H01F1/147

Abstract: The disclosure describes a method that includes forming a soft magnetic material by a technique including melt spinning. The soft magnetic material includes at least one of: at least one of an α″-Fe16(NxZ1-x)2 phase domain or an α′-Fe8(NxZ1-x), where Z includes at least one of C, B, or O, and where x is a number greater than zero and less than one; or at least one of an α″-Fe16N2 phase domain or an α′-Fe8N phase domain, and at least one of an α″-Fe16Z2 phase domain or an α′-Fe8Z phase domain.

公开(公告)号：US20220354973A1

公开(公告)日：2022-11-10

申请号：US17659953

申请日：2022-04-20

Applicant: Regents of the University of Minnesota

Inventor： Jian-Ping Wang ,  Kai Wu ,  Bin Ma ,  Jinming Liu

IPC: A61K49/18 ,  C09C1/22 ,  C09C3/00 ,  C09C3/04 ,  C09C3/08 ,  C09C3/10

Abstract: A method may include wet ball milling a plurality of iron nitride nanoparticles in the presence of a surface active agent to modify a surface of the plurality of iron nitride nanoparticles and form a plurality of surface-modified iron nitride nanoparticles for a variety of biomedical applications and soft magnetic materials related applications.