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

Matthiesen, David

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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:: 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

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS

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B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F9/082 - {atomising using a fluid

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

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
C01P2002/54 - one element only
C01P2006/42 - Magnetic properties

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
C04B2235/405 - Iron group metals
C04B2235/46 - Gases other than oxygen used as reactant, e.g. nitrogen used to make a nitride phase
C04B2235/465 - Ammonia
C04B35/58042 - {based on iron group metals nitrides}
C04B35/62615 - {High energy or reactive ball milling}
C04B35/6265 - {involving reduction or oxidation}
C04B35/6268 - {characterised by the applied pressure or type of atmosphere, e.g. in vacuum, hydrogen or a specific oxygen pressure}

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

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
H01F1/065 - {obtained by a reduction}
H01F1/083 - {in a bonding agent}
H01F1/24 - the particles being insulated
H01F41/0266 - {Moulding

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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:

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patent, November 1992

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Nano-crystal austenitic steel bulk material having ultra-hardness and toughness and excellent corrosion resistance, and method for production thereof
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Yadav, Tapesh; Alexander, John
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journal, November 1994

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Similar Records

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

Abstract

Citation Formats

Magnetic material containing rare earth element, iron, nitrogen, hydrogen and oxygen and bonded magnet containing the same patent, November 1992

Rare earth-iron-nitrogen system permanent magnet and process for producing the same patent, June 1995

Magnetic powder, permanent magnet produced therefrom and process for producing them patent, July 1997

Magnetic material and production method thereof patent, November 2001

Nano-crystal austenitic steel bulk material having ultra-hardness and toughness and excellent corrosion resistance, and method for production thereof patent-application, August 2006

Wear-resistant elements and method of making same patent-application, March 2007

Method of Forming Non-Stoichiometric Nanoscale Powder Comprising Temperature-Processing of a Stoichiometric Metal Compound patent-application, July 2009

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Iron nitride powders for use in magnetic, electromagnetic, and microelectronic devices patent-application, March 2011

Ferromagnetic Particles and Process for Producing the Same, Anisotropic Magnet and Bonded Magnet patent-application, September 2012

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

Magnetic material containing rare earth element, iron, nitrogen, hydrogen and oxygen and bonded magnet containing the same
patent, November 1992

Rare earth-iron-nitrogen system permanent magnet and process for producing the same
patent, June 1995

Magnetic powder, permanent magnet produced therefrom and process for producing them
patent, July 1997

Magnetic material and production method thereof
patent, November 2001

Nano-crystal austenitic steel bulk material having ultra-hardness and toughness and excellent corrosion resistance, and method for production thereof
patent-application, August 2006

Wear-resistant elements and method of making same
patent-application, March 2007

Method of Forming Non-Stoichiometric Nanoscale Powder Comprising Temperature-Processing of a Stoichiometric Metal Compound
patent-application, July 2009

Magnetic Material for High Frequency Wave, and Method for Production Thereof
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Iron nitride powders for use in magnetic, electromagnetic, and microelectronic devices
patent-application, March 2011

Ferromagnetic Particles and Process for Producing the Same, Anisotropic Magnet and Bonded Magnet
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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