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Iron nitride powder with anisotropic shape

Patent ·
OSTI ID:1986860
;
Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one α″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one α″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.
Research Organization:
University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
DOE Contract Number:
AR0000199
Assignee:
Regents of the University of Minnesota (Minneapolis, MN)
Patent Number(s):
11,511,344
Application Number:
16/737,156
OSTI ID:
1986860
Country of Publication:
United States
Language:
English

References (4)

Influence of milling temperature and atmosphere on the synthesis of iron nitrides by ball milling journal February 1996
Morphology and magnetic properties of α”-Fe16N2 nanoparticles synthesized from iron hydroxide and iron oxides journal January 2017
Challenge to the Synthesis of α''-Fe 16 N 2 Compound Nanoparticle with High Saturation Magnetization for Rare Earth Free New Permanent Magnetic Material journal July 2013
Field-ball milling induced anisotropy in magnetic particles journal December 2004

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