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：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：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：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.