Iron nitride permanent magnet and technique for forming iron nitride permanent magnet

Wang, Jianping; Jiang, Yanfeng

Title: Iron nitride permanent magnet and technique for forming iron nitride permanent magnet

Abstract

A bulk permanent magnetic material may include between about 5 volume percent and about 40 volume percent Fe16N2 phase domains, a plurality of nonmagnetic atoms or molecules forming domain wall pinning sites, and a balance soft magnetic material, wherein at least some of the soft magnetic material is magnetically coupled to the Fe16N2 phase domains via exchange spring coupling. In some examples, a bulk permanent magnetic material may be formed by implanting N+ ions in an iron workpiece using ion implantation to form an iron nitride workpiece, pre-annealing the iron nitride workpiece to attach the iron nitride workpiece to a substrate, and post-annealing the iron nitride workpiece to form Fe16N2 phase domains within the iron nitride workpiece.

Inventors:: Wang, Jianping; Jiang, Yanfeng

Issue Date:: 2020-06-23

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1651061

Patent Number(s):: 10692635

Application Number:: 15/622,785

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

Patent Classifications (CPCs):: B - PERFORMING OPERATIONS B22 - CASTING B22D - CASTING OF METALS

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

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B - PERFORMING OPERATIONS B22 - CASTING B22D - CASTING OF METALS
B22D11/001 - {of specific alloys}
B22D11/0622 - {formed by two casting wheels}

B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B22F7/08 - with one or more parts not made from powder {

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C2202/02 - Magnetic
C22C29/16 - based on nitrides {
C22C38/001 - {containing N}

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C23C14/48 - Ion implantation
C23C8/26 - of ferrous surfaces
C23C8/80 - After-treatment

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/055 - and magnetic transition metals, e.g. SmCo5
H01F1/0579 - {with exchange spin coupling between hard and soft nanophases, e.g. nanocomposite spring magnets}
H01F1/086 - {sintered}
H01F1/10 - non-metallic substances, e.g. ferrites {, e.g. [
H01F1/147 - Alloys characterised by their composition {
H01F1/34 - non-metallic substances, e.g. ferrites
H01F41/0253 - {for manufacturing permanent magnets}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
Y10T428/32 - Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer

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DOE Contract Number:: AR0000199

Resource Type:: Patent

Resource Relation:: Patent File Date: 06/14/2017

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Wang, Jianping, and Jiang, Yanfeng. Iron nitride permanent magnet and technique for forming iron nitride permanent magnet.  United States: N. p., 2020. 
        Web.

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                    Wang, Jianping, & Jiang, Yanfeng. Iron nitride permanent magnet and technique for forming iron nitride permanent magnet.  United States.

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                    Wang, Jianping, and Jiang, Yanfeng. Tue .  
        "Iron nitride permanent magnet and technique for forming iron nitride permanent magnet".  United States.  https://www.osti.gov/servlets/purl/1651061.

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@article{osti_1651061,

  title        = {Iron nitride permanent magnet and technique for forming iron nitride permanent magnet},

  author       = {Wang, Jianping and Jiang, Yanfeng},

  abstractNote = {A bulk permanent magnetic material may include between about 5 volume percent and about 40 volume percent Fe16N2 phase domains, a plurality of nonmagnetic atoms or molecules forming domain wall pinning sites, and a balance soft magnetic material, wherein at least some of the soft magnetic material is magnetically coupled to the Fe16N2 phase domains via exchange spring coupling. In some examples, a bulk permanent magnetic material may be formed by implanting N+ ions in an iron workpiece using ion implantation to form an iron nitride workpiece, pre-annealing the iron nitride workpiece to attach the iron nitride workpiece to a substrate, and post-annealing the iron nitride workpiece to form Fe16N2 phase domains within the iron nitride workpiece.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2020},

  month        = {6}

}

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