University of Minnesota

Guannan Guo

Jian-Ping Wang

Bin Ma

Yiming Wu

Jinming Liu

Xiaowei Zhang

Fan Zhang

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

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″-Fe(NZ)phase domain or an α'-Fe(NZ), 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″-FeNphase domain or an α′-FeN phase domain, and at least one of an α″-FeZphase domain or an α′-FeZ phase domain.

Magnetic material including α″-Fe(NZ)or a mixture of α″-FeZand α″-FeN, where Z includes at least one of C, B, or O

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Minneapolis, MN, United States of America

Guannan Guo