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

Abstract

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.

Inventors:
Issue Date:
Research Org.:
Case Western Reserve Univ., Cleveland, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1457699
Patent Number(s):
9,997,285
Application Number:
14/304,102
Assignee:
Case Western Reserve University (Cleveland, OH)
DOE Contract Number:  
AR0000194
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Jun 13
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Matthiesen, David. Transformation enabled nitride magnets absent rare earths and a process of making the same. United States: N. p., 2018. Web.
Matthiesen, David. Transformation enabled nitride magnets absent rare earths and a process of making the same. United States.
Matthiesen, David. Tue . "Transformation enabled nitride magnets absent rare earths and a process of making the same". United States. https://www.osti.gov/servlets/purl/1457699.
@article{osti_1457699,
title = {Transformation enabled nitride magnets absent rare earths and a process of making the same},
author = {Matthiesen, David},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {6}
}

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Works referenced in this record:

Synthesis and characterization of Fe16N2 in bulk form
journal, May 1994

  • Huang, M. Q.; Wallace, W. E.; Simizu, S.
  • Journal of Applied Physics, Vol. 75, Issue 10, p. 6574-6576
  • DOI: 10.1063/1.356925

The synthesis, structure, and characterization of α″‐Fe16N2 (invited)
journal, November 1994

  • Jack, K. H.
  • Journal of Applied Physics, Vol. 76, Issue 10, p. 6620-6625
  • DOI: 10.1063/1.358482

Enhanced Fe moment in nitrogen martensite and Fe16N2 (invited)
journal, November 1994

  • Wallace, W. E.; Huang, M. Q.
  • Journal of Applied Physics, Vol. 76, Issue 10, p. 6648-6652
  • DOI: 10.1063/1.358158