Anisotropic iron nitride permanent magnets

US11309107B2 · kind B2 · utility

Assignee

• NIRON MAGNETICS, INC. · US

Inventors

• Francis Johnson · Minneapolis, US
• Richard W. Greger · Corning, US
• John M. Larson · Northfield, US
• Yiming Wu · Nanhu, CN
• Fan Zhang · Lake Barrington, US
• Kathryn Sara DAMIEN · Minneapolis, US

Key dates

• Filing date: Feb 22, 2021
• Grant date: Apr 19, 2022
• Expiry date: Feb 22, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/64
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Disclosed herein is a permanent magnet comprising: a plurality of aligned iron nitride nanoparticles wherein the iron nitride nanoparticles include α″-Fe16N2 phase domains; wherein a ratio of integrated intensities of an α″-Fe16N2 (004) x-ray diffraction peak to an α″-α″-Fe16N2 (202) x-ray diffraction peak for the aligned iron nitride nanoparticles is greater than at least 7%, wherein the diffraction vector is parallel to alignment direction, and wherein the iron nitride nanoparticles exhibit a squareness measured parallel to the alignment direction that is greater than a squareness measured perpendicular to the alignment direction.