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Jian-Ping WANG, et al.
Iron Nitride Magnet
https://www.nironmagnetics.com/
Niron Magnetics
Permanent Magnets. Zero Rare Earths. Made in Minnesota. Reshaping tomorrow's technologies with the world's only high-performance, rare-earth-free permanent magnets.
https://interestingengineering.com/innovation/rare-earth-free-magnet-help-us?group=test_b
China-born scientist’s magnet made without rare earth element could now help US
Innovators could achieve next-generation device performance with Iron Nitride magnets.
Prabhat Ranjan Mishra
An innovation that came into existence years ago could now help the United States tackle China’s dominance in a key sector.
A scientist working at the University of Minnesota lab years ago developed the world’s first iron nitride magnet, a revolutionary technology forged from iron and nitrogen without using rare earth elements...
Niron Magnetics, the spin-off created by University of Minnesota materials scientist Jian-Ping Wang, is offering rare earth-free permanent magnets.
The company claims these are useful for consumer electronics and the motor powering industry. Permanent magnets are the invisible force that converts electricity to motion in your daily devices.
“We produce the world’s only high performance, rare-earth-free permanent magnets. Our Iron Nitride magnet technology and world-leading magnetics expertise enhance the applications that use magnets to help revolutionize your industry,” said the company in a statement...
The raw materials for Niron’s magnets are globally abundant and 100% domestically sourced, creating a permanently secure supply chain.
The company also claims that their magnets offer advanced performance as Iron Nitride has the greatest flux of any material known and unlocks fundamental advantages in device design.
Niron maintains that their streamlined process scales to meet demand using equipment proven in the industry, from nanoparticles to finished magnets.
At a time when the Asian giant is tightening export controls on critical minerals like samarium and dysprosium, Niron’s innovation promises a key alternative.
Niron’s magnets excel under 200 degrees Celsius (392 Fahrenheit), high-temperature applications still rely on China-controlled alloys...
https://cse.umn.edu/ece/jian-ping-wang
Jian-Ping Wang
Distinguished McKnight University Professor, Robert F. Hartmann Chair, Department of Electrical and Computer Engineering
Contact
jpwang@umn.edu
612-625-9509
6-153 Kenneth H. Keller Hall
200 Union Street Se
Minneapolis, MN 55455
https://nanospin.umn.edu/
Nanomagnetism and Quantum Spintronics Lab
PatentsInventor: WANG JIAN-PING // JIANG YANFENG
Applicant: UNIV MINNESOTA
US10504640 -- Iron nitride materials and magnets including iron nitride materials
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The disclosure describes magnetic materials including iron nitride, bulk permanent magnets including iron nitride, techniques for forming magnetic materials including iron nitride, and techniques for forming bulk permanent magnets including iron nitride.
US10573439 -- Multilayer iron nitride hard magnetic materials
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The disclosure describes multilayer hard magnetic materials including at least one layer including [alpha]"-Fe16N2 and at least one layer including [alpha]"-Fe16(NxZ1-x)2 or a mixture of [alpha]"-Fe16N2 and [alpha]"-Fe16Z2, where Z includes at least one of C, B, or O, and x is a number greater than zero and less than one. The disclosure also describes techniques for forming multilayer hard magnetic materials including at least one layer including [alpha]"-Fe16N2 and at least one layer including [alpha]"-Fe16(NxZ1-x)2 or a mixture of [alpha]"-Fe16N2 and [alpha]"-Fe16Z2 using chemical vapor deposition or liquid phase epitaxy.
US11195644 -- IRON NITRIDE MAGNETIC MATERIAL INCLUDING COATED NANOPARTICLES
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The disclosure describes techniques for forming nanoparticles including Fe16N2 phase. In some examples, the nanoparticles may be formed by first forming nanoparticles including iron, nitrogen, and at least one of carbon or boron. The carbon or boron may be incorporated into the nanoparticles such that the iron, nitrogen, and at least one of carbon or boron are mixed. Alternatively, the at least one of carbon or boron may be coated on a surface of a nanoparticle including iron and nitrogen. The nano particle including iron, nitrogen, and at least one of carbon or boron then may be annealed to form at least one phase domain including at least one of Fe16N2, Fe16(NB)2, Fe16(NC)2, or Fe16(NCB)2.
US11214862 -- FORMING IRON NITRIDE HARD MAGNETIC MATERIALS USING CHEMICAL VAPOR DEPOSITION OR LIQUID PHASE EPITAXY
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The disclosure describes techniques for forming hard magnetic materials including α″-Fe16N2 using chemical vapor deposition or liquid phase epitaxy and hard materials formed according to these techniques. A method comprises heating an iron source to form a vapor comprising an iron-containing compound; depositing iron from the vapor comprising the iron-containing compound and nitrogen from a vapor comprising a nitrogen-containing compound on a substrate to form a layer comprising iron and nitrogen; and annealing the layer comprising iron and nitrogen to form at least some crystals comprising α″-Fe16N2.
US11217371 -- IRON NITRIDE PERMANENT MAGNET AND TECHNIQUE FOR FORMING IRON NITRIDE PERMANENT MAGNET
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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.
US11511344 -- IRON NITRIDE POWDER WITH ANISOTROPIC SHAPE
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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 α″-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 α″-Fe16N2 phase domain, are described. Milling apparatuses utilizing elongated bars, an electric field, and a magnetic field also are disclosed.
US11581113 -- PRESERVATION OF STRAIN IN IRON NITRIDE MAGNET
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A permanent magnet may include a Fe16N2 phase in a strained state. In some examples, strain may be preserved within the permanent magnet by a technique that includes etching an iron nitride-containing workpiece including Fe16N2 to introduce texture, straining the workpiece, and annealing the workpiece. In some examples, strain may be preserved within the permanent magnet by a technique that includes applying at a first temperature a layer of material to an iron nitride-containing workpiece including Fe16N2, and bringing the layer of material and the iron nitride-containing workpiece to a second temperature, where the material has a different coefficient of thermal expansion than the iron nitride-containing workpiece. A permanent magnet including an Fe16N2 phase with preserved strain also is disclosed.
US11742117 -- IRON NITRIDE PERMANENT MAGNET AND TECHNIQUE FOR FORMING IRON NITRIDE PERMANENT MAGNET
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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.
US11859271 -- IRON NITRIDE COMPOSITIONS
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All example composition may include a plurality of grains including an iron nitride phase. The plurality of grains may have an average wain size between about 10 nm and about 200 nm. An example technique may include treating a composition including a plurality of grains including au iron-based phase to adjust an average grain size of the plurality of grains to between about 20 nm and about 100 ma. The example technique may include nitriding the plurality of grains to form or grow an iron nitride phase.
US11875934 -- IRON-RICH PERMANENT MAGNET
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The disclosure is directed to an iron-nitride material having a polycrystalline microstructure including a plurality of elongated crystallographic grains with grain boundaries, the iron-nitride material including at least one of an α″-Fe16N2 phase and a body-center-tetragonal (bct) phase comprising Fe and N. The disclosure is also directed a method producing an iron-nitride material. The method includes some combinations of preparing a raw material comprising iron, carrying out a microstructure build-up by annealing the prepared raw material at an elevated temperature and subsequently quenching the prepared raw material to produce a microstructure build-up material, annealing the microstructure build-up material, reducing the microstructure build-up material in a hydrogen environment, nitriding the reduced material to produce a nitrided material and subsequently quenching the nitrided material to a martensitic transformation temperature, stress annealing the nitrided material, and magnetic field annealing the stress-annealed material.
US11996232 -- APPLIED MAGNETIC FIELD SYNTHESIS AND PROCESSING OF IRON NITRIDE MAGNETIC MATERIAL
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To facilitate formation of iron nitride magnetic material.SOLUTION: A technique regarding applied magnetic field synthesis and processing of iron nitride magnetic material is disclosed. Some methods relate to casting iron-containing materials in presence of an applied magnetic field to form a workpiece containing at least one iron basal phase domain containing uniaxial magnetic anisotropy. Here, the applied magnetic field has intensity of at least about 0.01 Tesla (T). A workpiece produced by such a method, a device for producing such a workpiece, and a bulk material produced by such a method are also disclosed.
US12014853 -- IRON-NITRIDE MAGNET BY NITRIDING A POROUS STRUCTURE
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In general, the disclosure is directed to bulk iron-nitride materials having a polycrystalline microstructure having pores including a plurality of crystallographic grains surrounded by grain boundaries, where at least one crystallographic grain includes an iron-nitride phase including any of a body centered cubic (bcc) structure, a body centered tetragonal (bct), and a martensite structure. The disclosure further describes techniques producing a bulk iron-nitride material having a polycrystalline microstructure, including: melting an iron source to obtain a molten iron source; fast belt casting the molten iron source to obtain a cast iron source; cooling and shaping the cast iron source to obtain a bulk iron-containing material having a body-centered cubic (bcc) structure; annealing the bulk iron-containing material at an austenite transformation temperature and subsequently cooling the bulk iron-containing material; and nitriding the bulk iron-containing material to obtain the bulk iron-nitride material.
US2022354973 --IRON NITRIDE NANOPARTICLE SUSPENSION
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A method may include wet ball milling a plurality of iron nitride nanoparticles in the presence of a surface active agent to modify a surface of the plurality of iron nitride nanoparticles and form a plurality of surface-modified iron nitride nanoparticles for a variety of biomedical applications and soft magnetic materials related applications.