Method of making iron nitride powder with anisotropic shape
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 a″-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 a″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.
- Research Organization:
- Univ. 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):
- 10,562,103
- Application Number:
- 15/546,359
- OSTI ID:
- 1632557
- Country of Publication:
- United States
- Language:
- English
Influence of milling temperature and atmosphere on the synthesis of iron nitrides by ball milling
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journal | February 1996 |
Field-ball milling induced anisotropy in magnetic particles
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journal | December 2004 |
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