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

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

A permanent magnet may include a Fe₁₆N₂ phase constitution. In some examples, the permanent magnet may be formed by a technique that includes straining an iron wire or sheet comprising at least one iron crystal in a direction substantially parallel to a <001> crystal axis of the iron crystal; nitridizing the iron wire or sheet to form a nitridized iron wire or sheet; annealing the nitridized iron wire or sheet to form a Fe₁₆N₂ phase constitution in at least a portion of the nitridized iron wire or sheet; and pressing the nitridized iron wires and sheets to form bulk permanent magnet.

Issue Date:: 2018-09-04

OSTI Identifier:: 1473692

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

Patent Number(s):: 10,068,689

Application Number:: 14/238,835

Contract Number:: AR0000199

Resource Relation:: Patent File Date: 2012 Aug 17

Research Org:: Regents of the University of Minnesota, Minneapolis, MN (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Full Text
View Full Text

Other works cited in this record:

Magnetic material and production method thereof
patent, November 2001

Nagatomi, Akira; Kanamaru, Fumikazu; Kikkawa, Shinichi
US Patent Document 6,319,485
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F6319485

In situ evidence of enhanced transformation kinetics in a medium carbon steel due to a high magnetic field
journal, July 2004

Ludtka, G. M.; Jaramillo, R. A.; Kisner, R. A.
Scripta Materialia, Vol. 51, Issue 2, p. 171-174
DOI: 10.1016/j.scriptamat.2004.03.029

Projector augmented-wave method
journal, December 1994

Blöchl, P. E.
Physical Review B, Vol. 50, Issue 24, p. 17953-17979
DOI: 10.1103/PhysRevB.50.17953

Opportunities and challenges for a sustainable energy future
journal, August 2012

Chu, Steven; Majumdar, Arun
Nature, Vol. 488, Issue 7411, p. 294-303
DOI: 10.1038/nature11475

Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study
journal, January 1998

Dudarev, S. L.; Botton, G. A.; Savrasov, S. Y.
Physical Review B, Vol. 57, Issue 3, p. 1505-1509
DOI: 10.1103/PhysRevB.57.1505

A new challenge: grain boundary engineering for advanced materials by magnetic field application
journal, October 2006

Watanabe, Tadao; Tsurekawa, Sadahiro; Zhao, Xiang
Journal of Materials Science, Vol. 41, Issue 23, p. 7747-7759
DOI: 10.1007/s10853-006-0740-1

Self-Consistent Equations Including Exchange and Correlation Effects
journal, November 1965

Kohn, W.; Sham, L. J.
Physical Review, Vol. 140, Issue 4A, p. A1133-A1138
DOI: 10.1103/PhysRev.140.A1133

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
DOI: 10.1063/1.358158

Similar records in DOepatents and OSTI.GOV collections:

Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

Patent McCallum, R. William ; Branagan, Daniel J.

A method of making a permanent magnet wherein 1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and 2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified in a mannermore »« less
Full Text Available January 1996
Permanent magnet energy conversion machine with magnet mounting arrangement

Patent Hsu, John S. ; Adams, Donald J.

A hybrid permanent magnet dc motor includes three sets of permanent magnets supported by the rotor and three sets of corresponding stators fastened to the surrounding frame. One set of magnets operates across a radial gap with a surrounding radial gap stator, and the other two sets of magnets operate off the respective ends of the rotor across respective axial gaps.
Full Text Available January 1999
Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

Patent McCallum, R.W. ; Branagan, D.J.

A method of making a permanent magnet is disclosed wherein (1) a melt is formed having a base alloy composition comprising RE, Fe and/or Co, and B (where RE is one or more rare earth elements) and (2) TR (where TR is a transition metal selected from at least one of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Al) and at least one of C and N are provided in the base alloy composition melt in substantially stoichiometric amounts to form a thermodynamically stable compound (e.g. TR carbide, nitride or carbonitride). The melt is rapidly solidified inmore »« less
January 1996
Method for forming permanent magnets with different polarities for use in microelectromechanical devices

Patent Roesler, Alexander W ; Christenson, Todd R

Methods are provided for forming a plurality of permanent magnets with two different north-south magnetic pole alignments for use in microelectromechanical (MEM) devices. These methods are based on initially magnetizing the permanent magnets all in the same direction, and then utilizing a combination of heating and a magnetic field to switch the polarity of a portion of the permanent magnets while not switching the remaining permanent magnets. The permanent magnets, in some instances, can all have the same rare-earth composition (e.g. NdFeB) or can be formed of two different rare-earth materials (e.g. NdFeB and SmCo). The methods can be usedmore »« less
Full Text Available April 2007
Permanent magnet flowmeter having improved output terminal means

Patent August, Charles ; Myers, Harry J.

Disclosed is an improved permanent magnet flowmeter capable of withstanding bending stresses in the direction of induced emf signals. The flowmeter includes a unique terminal arrangement integrally formed with the flowmeter by trepanning opposing wall sections of the flowmeter body. The terminal arrangement provides increased flowmeter sensitivity by increasing the strength of the induced emf signals.
Full Text Available January 1984