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PRESERVATION OF STRAIN IN IRON NITRIDE MAGNET

United States Patent Application

20170365381
A1
View the Complete Application at the US Patent & Trademark Office
A permanent magnet may include a Fe16N2 phase in a strained state. In some examples, strain may be preserved within the permanent magnet by a technique that includes etching an iron nitride-containing workpiece including Fe16N2 to introduce texture, straining the workpiece, and annealing the workpiece. In some examples, strain may be preserved within the permanent magnet by a technique that includes applying at a first temperature a layer of material to an iron nitride-containing workpiece including Fe16N2, and bringing the layer of material and the iron nitride-containing workpiece to a second temperature, where the material has a different coefficient of thermal expansion than the iron nitride-containing workpiece. A permanent magnet including an Fe16N2 phase with preserved strain also is disclosed.
WANG, Jian-Ping (Shoreview, MN), JIANG, YanFeng (Minneapolis, MN)
15/ 546,387
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.