Iron Nitride Permanent Magnet
Iron Nitride Permanent Magnet
(OP)
Can anyone comment on the validity of the claims in this article, from the University of Minnesota?
http://license.umn.edu/technologies/20120016_iron-...
Some searching on Google turns up articles that just parrot this one, and some research papers dated from the 1990's.
Is there some reason to think a breakthrough has been made, or is this just the sales staff at UM's technology transfer office polishing an old t***?
http://license.umn.edu/technologies/20120016_iron-...
Some searching on Google turns up articles that just parrot this one, and some research papers dated from the 1990's.
Is there some reason to think a breakthrough has been made, or is this just the sales staff at UM's technology transfer office polishing an old t***?
STF





RE: Iron Nitride Permanent Magnet
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Iron Nitride Permanent Magnet
Often, the faculty involved will form companies to capitalize on their inventions; the lack of such suggests that the technology had issues.
TTFN (ta ta for now)
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RE: Iron Nitride Permanent Magnet
The big challenge are the formation and decomopistion of Fe16N2. The conditions (temp, pressure etc.)are very strict to form a pure phase. Most importantly, it is almost limited to thin film and powder. Imagine that it is normal to do a surface Nitrogen hardening, but never heard the whole bulk part can be hardened.
On the other hand, Fe16N2 is a metastable phase, it can decomposite to other phases, so even if you could be able to make a big amount of powder, it is hard to consolidate to full density.
The biggest magnetic challenge is the coercivity, in order to get the claimed 130MGOe, the coercivity needs to be at least half of Bs value, in this case, > 1,2000Oe, plus, the hysteresis loop needs to be square when Hc is only 1,2000Oe. I am not sure if anyone reached a Hc of > 5,000Oe even in the thin film structure.
Being said, I think the potential for a breakthrough innovation exists due to its very high Ms and a high magnetocrystalline anisotropy (for a high Hc). A permanent magnet without rare earth has still been a hot topic.
RE: Iron Nitride Permanent Magnet
The PR value of getting away from heavy-element mining would be a big attraction, too, to those industries that use magnets for "Green" purposes.
Thanks!
STF
RE: Iron Nitride Permanent Magnet
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm