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IRON NITRIDE POWDER WITH ANISOTROPIC SHAPE

United States Patent Application

20180001385
A1
View the Complete Application at the US Patent & Trademark Office
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.
WANG, Jian-Ping (Shoreview, MN), JIANG, YanFeng (Minneapolis, MN)
15/ 546,359
January 22, 2016
GOVERNMENT INTEREST IN INVENTION [0002] This invention was made with government support under the ARPA-E project, DE-AR0000199, awarded by the Department of Energy. The government has certain rights in the invention.