Method of making iron nitride powder with anisotropic shape

Title: Method of making iron nitride powder with anisotropic shape

Abstract

Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one a″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one a″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.

Inventors:: Wang, Jian-Ping; Jiang, YanFeng

Issue Date:: 2020-02-18

Research Org.:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Org.:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

OSTI Identifier:: 1632557

Patent Number(s):: 10562103

Application Number:: 15/546,359

Assignee:: Regents of the University of Minnesota (Minneapolis, MN)

Patent Classifications (CPCs):: H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER

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

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F2202/03 - Treatment under cryogenic or supercritical conditions
B22F2201/11 - Argon

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C33/02 - by powder metallurgy

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F9/20 - starting from solid metal compounds
B22F2201/016 - NH3
B22F9/04 - starting from solid material, e.g. by crushing, grinding or milling
B22F2202/05 - Use of magnetic field
B22F2201/02 - Nitrogen
B22F2009/045 - {by other means than ball or jet milling}
B22F2009/042 - {using a particular milling fluid}
B22F2998/10 - Processes characterised by the sequence of their steps
B22F2001/0033 - {Flake form nanoparticles}

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

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F2201/50 - air
B22F2999/00 - Aspects linked to processes or compositions used in powder metallurgy

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/086 - {sintered}

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F1/0018 - {Nanometer sized particles}
B22F1/0088 - {Chemical treatment, e.g. passivation}

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

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C23C8/26 - of ferrous surfaces

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DOE Contract Number:: AR0000199

Resource Type:: Patent

Resource Relation:: Patent File Date: 01/22/2016

Country of Publication:: United States

Language:: English

Citation Formats


                    Wang, Jian-Ping, and Jiang, YanFeng. Method of making iron nitride powder with anisotropic shape.  United States: N. p., 2020. 
        Web.

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                    Wang, Jian-Ping, & Jiang, YanFeng. Method of making iron nitride powder with anisotropic shape.  United States.

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                    Wang, Jian-Ping, and Jiang, YanFeng. Tue .  
        "Method of making iron nitride powder with anisotropic shape".  United States.  https://www.osti.gov/servlets/purl/1632557.

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@article{osti_1632557,

  title        = {Method of making iron nitride powder with anisotropic shape},

  author       = {Wang, Jian-Ping and Jiang, YanFeng},

  abstractNote = {Techniques are disclosed for milling an iron-containing raw material in the presence of a nitrogen source to generate anisotropically shaped particles that include iron nitride and have an aspect ratio of at least 1.4. Techniques for nitridizing an anisotropic particle including iron, and annealing an anisotropic particle including iron nitride to form at least one a″-Fe16N2 phase domain within the anisotropic particle including iron nitride also are disclosed. In addition, techniques for aligning and joining anisotropic particles to form a bulk material including iron nitride, such as a bulk permanent magnet including at least one a″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2020},

  month        = {2}

}

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Works referenced in this record:

Method for producing iron-nitride powders
patent, July 1994

Koyano, Tamotsu; Mizutani, Uichiro
US Patent Document 5,330,554
URL: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=5330554

Iron nitride magnetic powder and method of producing the powder
patent-application, September 2005

Masada, Kenji; Amino, Takafumi; Nagatomi, Akira
US Patent Application 11/064939; 20050208320
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220050208320%22.PGNR.&OS=DN/20050208320&RS=DN/20050208320

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Title: Method of making iron nitride powder with anisotropic shape

Abstract

Citation Formats

Method for producing iron-nitride powders patent, July 1994

Iron nitride magnetic powder and method of producing the powder patent-application, September 2005

Method for producing iron-nitride powders
patent, July 1994

Iron nitride magnetic powder and method of producing the powder
patent-application, September 2005