Transformation enabled nitride magnets absent rare earths and a process of making the same

Matthiesen, David

Title: Transformation enabled nitride magnets absent rare earths and a process of making the same

Patent · Tue Jun 12 00:00:00 EDT 2018

OSTI ID:1457699

Matthiesen, David

A process for producing an ordered martensitic iron nitride powder that is suitable for use as a permanent magnetic material is provided. The process includes fabricating an iron alloy powder having a desired composition and uniformity; nitriding the iron alloy powder by contacting the material with a nitrogen source in a fluidized bed reactor to produce a nitride iron powder; transforming the nitride iron powder to a disordered martensitic phase; annealing the disordered martensitic phase to an ordered martensitic phase; and separating the ordered martensitic phase from the iron nitride powder to yield an ordered martensitic iron nitride powder.

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Research Organization:: Case Western Reserve Univ., Cleveland, OH (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AR0000194

Assignee:: Case Western Reserve University (Cleveland, OH)

Patent Number(s):: 9,997,285

Application Number:: 14/304,102

OSTI ID:: 1457699

Resource Relation:: Patent File Date: 2014 Jun 13

Country of Publication:: United States

Language:: English

References (13)

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Rare earth-iron-nitrogen system permanent magnet and process for producing the same Hirosawa, Satoshi; Ikegami, Takashi; Makita, Ken https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5425818 US Patent Document 5,425,818	patent	June 1995
Magnetic powder, permanent magnet produced therefrom and process for producing them Kitazawa, Atsunori; Ishibashi, Toshiyuki; Akioka, Koji https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5647886 US Patent Document 5,647,886	patent	July 1997
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Nano-crystal austenitic steel bulk material having ultra-hardness and toughness and excellent corrosion resistance, and method for production thereof Miura, Harumatsu; Miyan, Nobuaki; Ogawa, Hidenori https://doi.org/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/20060193742 US Patent Application 10/529418; 20060193742	patent-application	August 2006
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