Iron nitride permanent magnet and technique for forming iron nitride permanent magnet
US-2015380135-A1 · Dec 31, 2015 · US
Method to synthesize bulk iron nitride
US9963344B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9963344-B2 |
| Application number | US-201615002220-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 20, 2016 |
| Priority date | Jan 21, 2015 |
| Publication date | May 8, 2018 |
| Grant date | May 8, 2018 |
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Abstract
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Bulk iron nitride can be synthesized from iron nitride powder by spark plasma sintering. The iron nitride can be spark plasma sintered at a temperature of less than 600° C. and a pressure of less than 600 MPa, with 400 MPa or less most often being sufficient. High pressure SPS can consolidate dense iron nitrides at a lower temperature to avoid decomposition. The higher pressure and lower temperature of spark discharge sintering avoids decomposition and limits grain growth, enabling enhanced magnetic properties. The method can further comprise synthesis of nanocrystalline iron nitride powders using two-step reactive milling prior to high-pressure spark discharge sintering.
First claim
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We claim: 1. A method to synthesize bulk iron nitride, comprising: cryogenic milling an iron powder at a low temperature to form a nanocrystalline iron powder, milling the cryogenic milled nanocrystalline iron powder in anhydrous ammonia to provide an iron nitride powder, and consolidating the iron nitride powder by spark plasma sintering to provide a bulk iron nitride. 2. The method of claim 1 , wherein the iron nitride powder is spark plasma sintered at a temperature of less than 600° C. and a pressure of less than 600 MPa. 3. The method of claim 2 , wherein the iron nitride powder is spark plasma sintered at a temperature greater than 500° C. 4. The method of claim 2 , wherein the iron nitride powder is spark plasma sintered at a pressure greater than 100 MPa. 5. The method of claim 1 , wherein the iron powder is cryogenic milled at liquid nitrogen temperature. 6. The method of claim 1 , wherein the nanocrystalline iron powder has a grain size less than 100 nanometers. 7. The method of claim 1 , wherein the nanocrystalline iron powder is milled in anhydrous ammonia at or near room temperature.
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Nanometer sized, i.e. from 1-100 nanometer · CPC title
- C01B21/0622Primary
with iron, cobalt or nickel · CPC title
Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title
based on iron group metals nitrides · CPC title
Materials characterised by the absence of phases other than the main phase, i.e. single phase materials · CPC title
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- What does patent US9963344B2 cover?
- Bulk iron nitride can be synthesized from iron nitride powder by spark plasma sintering. The iron nitride can be spark plasma sintered at a temperature of less than 600° C. and a pressure of less than 600 MPa, with 400 MPa or less most often being sufficient. High pressure SPS can consolidate dense iron nitrides at a lower temperature to avoid decomposition. The higher pressure and lower temper…
- Who is the assignee on this patent?
- Nat Tech & Eng Solutions Sandia Llc, Lavernia Enrique J, Zheng Baolong, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification C01B21/0622. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 08 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).