University of Minnesota

Ut-Battelle, Inc.

Xiaowei Zhang

Jian-Ping Wang

Orlando Rios

Gerard Michael Ludtka

Michael P Brady

Craig A Bridges

Edgar Lara-Curzio

Lawrence F Allard

Yanfeng Jiang

Yiming Wu

Bin Ma

Jinming Liu

Fan Zhang

Guannan Guo

YanFeng Jiang

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-nitride magnet by nitriding a porous structure

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

Applied magnetic field synthesis and processing of iron nitride magnetic materials

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Minneapolis, MN, United States of America

Xiaowei Zhang