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

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:: Matthiesen, David

Issue Date:: 2018-06-12

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

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B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F1/02 - comprising coating of the powder {
B22F9/082 - {atomising using a fluid

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/065 - {obtained by a reduction}

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B35/58042 - {based on iron group metals nitrides}
C04B35/62615 - {High energy or reactive ball milling}
C04B2235/465 - Ammonia
C04B2235/405 - Iron group metals
C04B35/6265 - {involving reduction or oxidation}

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C33/0264 - {the maximum content of each alloying element not exceeding 5%}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C01P2002/54 - one element only

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B35/6268 - {characterised by the applied pressure or type of atmosphere, e.g. in vacuum, hydrogen or a specific oxygen pressure}

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F41/0266 - {Moulding

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C23C8/62 - only one element being applied

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/24 - the particles being insulated

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C01B21/0622 - {with iron, cobalt or nickel}

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B2235/46 - Gases other than oxygen used as reactant, e.g. nitrogen used to make a nitride phase

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C01P2006/42 - Magnetic properties

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/083 - {in a bonding agent}

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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.

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                    Matthiesen, David. Transformation enabled nitride magnets absent rare earths and a process of making the same.  United States.

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                    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.

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@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
https://doi.org/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
https://doi.org/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
https://doi.org/10.1063/1.358158

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