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：US20210180174A1

公开(公告)日：2021-06-17

申请号：US17182857

申请日：2021-02-23

Applicant: Regents of the University of Minnesota ,  UT-BATTELLE, LLC

Inventor： Michael P. BRADY ,  Orlando RIOS ,  YanFeng JIANG ,  Gerard M. LUDTKA ,  Craig A. BRIDGES ,  Jian-Ping WANG ,  Xiaowei ZHANG ,  Lawrence F. ALLARD ,  Edgar LARA-CURZIO

IPC: C23C8/26 ,  C21D1/26 ,  C21D6/00 ,  C22C38/00 ,  C23C28/00 ,  C01B21/06 ,  C22C33/00 ,  H01F1/06

Abstract: A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe16N2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).

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.