Neodymium-iron-boron magnet with selective surface modification, and method of producing same

Title: Neodymium-iron-boron magnet with selective surface modification, and method of producing same

Abstract

A bulk high performance permanent magnet comprising a neodymium-iron-boron core having an outer surface, and a coercivity-enhancing element residing on at least a portion of said outer surface, with an interior portion of said neodymium-iron-boron core not having said coercivity-enhancing element therein. Also described herein is a method for producing the high-coercivity bulk permanent magnet, the method comprising: (i) depositing a coercivity-enhancing element on at least a portion of an outer surface of a neodymium-iron-boron core substrate to form a coated permanent magnet; and (ii) subjecting the coated permanent magnet to a pulse thermal process that heats said outer surface to a substantially higher temperature than an interior portion of said neodymium-iron-boron core substrate, wherein said substantially higher temperature is at least 200° C. higher than said interior portion and is of sufficient magnitude to induce diffusion of said coercivity-enhancing element below said outer surface but outside of said interior portion.

Inventors:: Paranthaman, Mariappan Parans; McGuire, Michael A.; Parker, David S.; Rios, Orlando; Sales, Brian C.; Ucar, Huseyin; Mccall, Scott K.; McCallum, R. William; Nlebedim, Cajetan I.

Issue Date:: 2020-03-10

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1637879

Patent Number(s):: 10586640

Application Number:: 15/415,766

Assignee:: UT-Battelle, LLC (Oak Ridge, TN); Iowa State University Research Foundation, Inc. (Ames, IA); Lawrence Livermore National Security, LLC (Livermore, CA)

Patent Classifications (CPCs):: C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS

C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

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C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C38/005 - {containing rare earths, i.e. Sc, Y, Lanthanides}

C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
C21D6/00 - Heat treatment of ferrous alloys

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F1/0577 - {sintered}
H01F41/0293 - {diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets}

C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
C22C38/002 - {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
C23C14/165 - {by cathodic sputtering}

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
H01F7/021 - {Construction of PM

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DOE Contract Number:: AC05-00OR22725; AC02-07CH11358

Resource Type:: Patent

Resource Relation:: Patent File Date: 01/25/2017

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Paranthaman, Mariappan Parans, McGuire, Michael A., Parker, David S., Rios, Orlando, Sales, Brian C., Ucar, Huseyin, Mccall, Scott K., McCallum, R. William, and Nlebedim, Cajetan I. Neodymium-iron-boron magnet with selective surface modification, and method of producing same.  United States: N. p., 2020. 
        Web.

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                    Paranthaman, Mariappan Parans, McGuire, Michael A., Parker, David S., Rios, Orlando, Sales, Brian C., Ucar, Huseyin, Mccall, Scott K., McCallum, R. William, & Nlebedim, Cajetan I. Neodymium-iron-boron magnet with selective surface modification, and method of producing same.  United States.

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                    Paranthaman, Mariappan Parans, McGuire, Michael A., Parker, David S., Rios, Orlando, Sales, Brian C., Ucar, Huseyin, Mccall, Scott K., McCallum, R. William, and Nlebedim, Cajetan I. Tue .  
        "Neodymium-iron-boron magnet with selective surface modification, and method of producing same".  United States.  https://www.osti.gov/servlets/purl/1637879.

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@article{osti_1637879,

  title        = {Neodymium-iron-boron magnet with selective surface modification, and method of producing same},

  author       = {Paranthaman, Mariappan Parans and McGuire, Michael A. and Parker, David S. and Rios, Orlando and Sales, Brian C. and Ucar, Huseyin and Mccall, Scott K. and McCallum, R. William and Nlebedim, Cajetan I.},

  abstractNote = {A bulk high performance permanent magnet comprising a neodymium-iron-boron core having an outer surface, and a coercivity-enhancing element residing on at least a portion of said outer surface, with an interior portion of said neodymium-iron-boron core not having said coercivity-enhancing element therein. Also described herein is a method for producing the high-coercivity bulk permanent magnet, the method comprising: (i) depositing a coercivity-enhancing element on at least a portion of an outer surface of a neodymium-iron-boron core substrate to form a coated permanent magnet; and (ii) subjecting the coated permanent magnet to a pulse thermal process that heats said outer surface to a substantially higher temperature than an interior portion of said neodymium-iron-boron core substrate, wherein said substantially higher temperature is at least 200° C. higher than said interior portion and is of sufficient magnitude to induce diffusion of said coercivity-enhancing element below said outer surface but outside of said interior portion.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2020},

  month        = {3}

}

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Works referenced in this record:

R—Fe—B rare earth sintered magnet and method for producing same
patent, June 2012

Yoshimura, Koshi; Morimoto, Hideyuki; Odaka, Tomoori
US Patent Document 8,206,516
URL: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=8206516

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Title: Neodymium-iron-boron magnet with selective surface modification, and method of producing same

Abstract

Citation Formats

R—Fe—B rare earth sintered magnet and method for producing same patent, June 2012

R—Fe—B rare earth sintered magnet and method for producing same
patent, June 2012