Iron nitride permanent magnet and technique for forming iron nitride permanent magnet
US-9715957-B2 · Jul 25, 2017 · US
Applied magnetic field synthesis and processing of iron nitride magnetic materials
US9994949B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9994949-B2 |
| Application number | US-201514754284-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 29, 2015 |
| Priority date | Jun 30, 2014 |
| Publication date | Jun 12, 2018 |
| Grant date | Jun 12, 2018 |
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Abstract
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A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe 16 N 2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).
First claim
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The invention claimed is: 1. A method comprising: solutionizing a material including iron and nitrogen in the presence of an applied magnetic field with a strength of at least about 9 T magnetic field at about 750° C.; and after solutionizing the material including iron and nitrogen, quenching the material including iron and nitrogen; and annealing the material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe 16 N 2 phase domain, wherein the applied magnetic field has a strength of at least about 0.2 Tesla (T). 2. The method of claim 1 , wherein the strength of the high magnetic field is greater than about 2.5 T. 3. The method of claim 1 , wherein the strength of the high magnetic field is between about 8 T and about 10 T. 4. The method of claim 1 , wherein the strength of the high magnetic field is greater than about 9 T. 5. The method of claim 1 , wherein annealing the material comprises heating the material at a temperature of between about 120° C. to about 200° C. for between about 10 hours and about 100 hours. 6. The method of claim 5 , wherein annealing the material comprises heating the material at a temperature between about 150° C. and about 160° C. for between about 10 hours and about 30 hours. 7. The method of claim 1 , wherein the material comprises at least one of a pellet, rod, thin film, nanoparticle, powder, or nanoscale powder. 8. The method of claim 1 , wherein the material further comprises at least one dopant. 9. The method of claim 8 , wherein the at least one dopant comprises at least one of Al, Mn, La, Cr, Co, Ti, Ni, or a rare earth metal. 10. The method of claim 8 , wherein the at least one dopant comprises at least one of B, C, P, Si, or 0. 11. The method of claim 1 , wherein annealing the material in the presence of the applied magnetic field transforms an α′-Fe8N phase in the material to an α″-Fe16N2 phase. 12. The method of claim 11 , wherein a transformation yield of the α′-Fe8N phase to the α″-Fe16N2 phase is at least 70%. 13. The method of claim 1 , wherein, after annealing, the α″-Fe16N2 phase in the material is at least 20% of the material by volume. 14. The method of claim 1 , wherein the applied magnetic field is applied in substantial alignment with a c axis of at least one iron crystal in the material. 15. The method of claim 1 , wherein, prior to annealing the material, the concentration of nitrogen in the material is between about 8 atomic percent (at. %) and about 9 at. %.
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Classifications
Magnetic properties · CPC title
with iron, cobalt or nickel · CPC title
including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates · CPC title
containing N · CPC title
Alloys characterised by their composition · CPC title
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Frequently asked questions
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- What does patent US9994949B2 cover?
- A method may include annealing a material including iron and nitrogen in the presence of an applied magnetic field to form at least one Fe 16 N 2 phase domain. The applied magnetic field may have a strength of at least about 0.2 Tesla (T).
- Who is the assignee on this patent?
- Univ Minnesota, Ut Battelle Llc
- What technology area does this patent fall under?
- Primary CPC classification C23C8/26. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 12 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).