|
RoughNex
Unrated 4 LIFE!




Registered: 03/30/10
Posts: 125
Last seen: 8 years, 3 months
|
Re-magnetizing Neodymium magnet: How to?
#13338382 - 10/15/10 12:17 AM (13 years, 7 months ago) |
|
|
On accident, I heated a small Neodymium magnet above the Curie Point. Rendering it useless... Any ideas on how to re-magnetize it back fully?? Or is it now S.O.L.
-------------------- Everything You'll Ever Need To Know "Do not go where the path may lead, go instead where there is no path and leave a trail." -Ralph Emerson
Edited by RoughNex (10/15/10 12:18 AM)
|
wildernessjunkie
Reshitivest



Registered: 06/13/10
Posts: 8,118
Loc: HTTP 404 Not Found
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: RoughNex]
#13338490 - 10/15/10 12:58 AM (13 years, 7 months ago) |
|
|
Just wanted this thread. No input. Sorry.
|
DieCommie

Registered: 12/11/03
Posts: 29,258
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: RoughNex]
#13339208 - 10/15/10 08:37 AM (13 years, 7 months ago) |
|
|
Try reheating it up in an super strong magnetic field. Getting a strong enough magnetic field may be hard.
|
ChuangTzu
starvingphysicist




Registered: 09/04/02
Posts: 3,060
Last seen: 10 years, 7 months
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: DieCommie]
#13339232 - 10/15/10 08:51 AM (13 years, 7 months ago) |
|
|
Quote:
DieCommie said: Getting a strong enough magnetic field may be hard.
Very hard depending on the size of the magnet.
Quote:
32. How strong of a magnetic field is necessary to magnetize a neodymium magnet? As a general rule of thumb, a peak field of between 2 and 2.5 times the intrinsic coercivity is required to fully saturate a magnet. For standard neodymium magnets, the field required is minimum of 24 KOe, but 30 KOe is usually the minimum used.
http://www.kjmagnetics.com/FAQ.asp#magnetize
For that, you'd probably need something like this:
http://www.allmagnetics.com/device/magnetizer.htm
You might be able to send it to K&J or some other magnet company to get re-magnetized.
|
RoughNex
Unrated 4 LIFE!




Registered: 03/30/10
Posts: 125
Last seen: 8 years, 3 months
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: ChuangTzu]
#13340231 - 10/15/10 12:58 PM (13 years, 7 months ago) |
|
|
Thanks for the advice!
I was really hoping for a DIY method to re-magnetize it if at all possible.
Quote:
ChuangTzu said:
32. How strong of a magnetic field is necessary to magnetize a neodymium magnet? As a general rule of thumb, a peak field of between 2 and 2.5 times the intrinsic coercivity is required to fully saturate a magnet. For standard neodymium magnets, the field required is minimum of 24 KOe, but 30 KOe is usually the minimum used.
Let see if I'm reading this right.. I would need another neodymium magnet w/ even more force to fully re-magnetize it?
Edited by RoughNex (10/15/10 01:01 PM)
|
Seuss
Error: divide byzero



Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 3 months, 8 days
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: RoughNex]
#13340633 - 10/15/10 02:57 PM (13 years, 7 months ago) |
|
|
> I would need another neodymium magnet w/ even more force to fully re-magnetize it?
Almost... Try, "I would need a magnetic field w/ almost double the force to fully re-magnetize it."
|
Stonehenge
Alt Center

Registered: 06/20/04
Posts: 14,850
Loc: S.E.
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: Seuss]
#13341170 - 10/15/10 05:40 PM (13 years, 7 months ago) |
|
|
Toss it. They are cheaper to buy than to make. I've got some, want to trade?
-------------------- “A democracy cannot exist as a permanent form of government. It can only exist until the voters discover that they can vote themselves largesse from the public treasury. From that moment on, the majority always votes for the candidates promising the most benefits from the public treasury with the result that a democracy always collapses over loose fiscal policy, always followed by a dictatorship.” (attributed to Alexis de Tocqueville political philosopher Circa 1835) Trade list http://www.shroomery.org/forums/showflat.php/Number/18047755
|
Annom
※※※※※※




Registered: 12/22/02
Posts: 6,367
Loc: Europe
Last seen: 1 year, 3 days
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: RoughNex]
#13343690 - 10/16/10 12:00 PM (13 years, 7 months ago) |
|
|
The Curie temperature of Neodymium magnets is about 300 C. What did you do with the magnet to make it that hot?
|
ToTheSummit
peregrinus



Registered: 08/22/99
Posts: 9,127
Loc: Las Vegas
Last seen: 2 days, 15 hours
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: Stonehenge]
#13343870 - 10/16/10 12:41 PM (13 years, 7 months ago) |
|
|
Quote:
Stonehenge said: Toss it. They are cheaper to buy than to make. I've got some, want to trade?
That was my first thought. I got on a kick playing with magnets a few years back and still have a bunch hanging around here. KJMagnetics was a great site to order from. I still show my magnetic levitator to people all the time.
-------------------- You invented the wheel....You push the motherfucker!!
|
RoughNex
Unrated 4 LIFE!




Registered: 03/30/10
Posts: 125
Last seen: 8 years, 3 months
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: Annom]
#13350300 - 10/17/10 10:09 PM (13 years, 7 months ago) |
|
|
Thanks for all your advice! I Think y'all are right to toss it. It was relatively small anyways and it was really just curiosity as to if it could be done with some easy to get supplies from around the house.
Quote:
Annom said: The Curie temperature of Neodymium magnets is about 300 C. What did you do with the magnet to make it that hot?
Let's just say I also have a thing for propane torches Long story short..
-------------------- Everything You'll Ever Need To Know "Do not go where the path may lead, go instead where there is no path and leave a trail." -Ralph Emerson
|
Aaron Becker
Stranger
Registered: 08/02/14
Posts: 1
Last seen: 9 years, 9 months
|
Re: Re-magnetizing Neodymium magnet: How to? [Re: RoughNex]
#20363651 - 08/02/14 06:13 AM (9 years, 9 months ago) |
|
|
Another option is to bring the magnet with you to an MRI. MRI strengths are measured in Tesla and most scanners are 1.5 or 3T. 3T = 30,000 gauss, so this should be enough to remagnetize your magnet. Only a cheap option for a select few.
|
|