Iron-nitride magnet by nitriding a porous structure

US12014853B2 · kind B2 · utility

Assignee

• Regents of the University of Minnesota · US

Inventors

• Jian-Ping Wang · Shoreview, US
• Jinming Liu · Chengdu, CN
• Bin Ma · Plainsboro, US
• Fan Zhang · Lake Barrington, US
• Guannan Guo · Pinellas Park, US
• Yiming Wu · Nanhu, CN
• Xiaowei Zhang · Union, US

Key dates

• Filing date: May 28, 2019
• Grant date: Jun 18, 2024
• Expiry date: Jul 21, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/42
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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.