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.

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.

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.

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

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

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：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.

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

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: 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.

公开(公告)号：US20240363269A1

公开(公告)日：2024-10-31

申请号：US18665020

申请日：2024-05-15

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 ,  C01B21/06 ,  C23C8/02 ,  C23C8/26 ,  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：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.

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.