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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):
9997285
Application Number:
14/304,102
Assignee:
Case Western Reserve University (Cleveland, OH)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
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


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


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