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Author: Subject: DIYable moderate Curie Temperature Alloys/Materials
ElizabethGreene
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[*] posted on 14-12-2015 at 17:14
DIYable moderate Curie Temperature Alloys/Materials


I'm playing with a thermomagnetic engine idea, and am having a great deal of trouble finding a suitable carrier material. I'd like to find something DIYable with a Curie temperature between 100 and 300 C, with lower being better.

Any suggestions for something that's Diy-able and doesn't cost >$1/gram like In and Gd?

Related: Could I make MnB by reducing MnO3 and Boric Acid with Carbon?

TIA.




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Morgan
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[*] posted on 14-12-2015 at 18:52


If you can find alumel that might be something you would like.
https://www.youtube.com/watch?v=xszVy0qM_sw

If you had some invar 36, it works at 280C or with less nickel even around room temperatures depending on the ratio of nickel to iron.

"Later in the same year Hopkinson discovered that a sample of 25% nickel steel furnished to him was practically non-magnetizable at ordinary temperatures ... it retained its non-magnetic condition while being heated up to 700 or 800 C and did not recalesce on cooling from a high temperature. But when the temperature was reduced to a little below 0 C, ferromagnetic properties appeared, which were strongly intensified by further cooling. Moreover, cooling to -50 C with solid carbon dioxide effected such a transformation that, when the specimen was returned to 13 C, it was found changed from a non-magnetizable to a decidedly magnetizable substance; and it remained magnetizable on heating until 580 C was reached. In the neighborhood of this temperature it again became magnetizable and continued so on cooling to the temperature of the room. By these experiments Hopkinson showed that the material can, at ordinary temperatures, exist in either of two quite different states. both of which are stable." (page 4)

Invar and related nickel steels April 4, 1916
http://books.google.com/books?id=ztAOd_hH7h4C&pg=PA23&am...

https://www.cartech.com/techarticles.aspx?id=1664


[Edited on 15-12-2015 by Morgan]
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ElizabethGreene
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[*] posted on 15-12-2015 at 11:06


Quote: Originally posted by Morgan  
If you can find alumel that might be something you would like.
[Edited on 15-12-2015 by Morgan]


Alumel would be perfect. I'll see if I can find some. Thanks!




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ElizabethGreene
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[*] posted on 8-3-2016 at 08:51


Thread necromancy commence. Arise long dead thread, Arise!

I had difficulty locating a source of Alumel, but was able to get some from a company called Concept Alloys.

I've been playing with it and made a couple of thermomagnetic motors.

Revision 1, cycled a couple of times, but was not great.
https://www.youtube.com/watch?v=HAhV68TuR9c
<iframe sandbox src="https://www.youtube.com/embed/HAhV68TuR9c" frameborder="0" allowfullscreen></iframe>

Revision 2 didn't work at all.

Revision 3 taught me that I didn't understand how magnets work. After I reworked it to actually physics, it works spectacularly. I see what I need to change to make it go faster for r4.
https://youtu.be/81lEgQs45z8
<iframe sandbox src="https://www.youtube.com/embed/81lEgQs45z8" frameborder="0" allowfullscreen></iframe>

Edit: How do I embed videos? The Youtube "share" code didn't work.

[Edited on 8-3-2016 by ElizabethGreene]




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[*] posted on 8-3-2016 at 09:21


You can't. The option to embed videos was recently disabled due to security issues. http://www.sciencemadness.org/talk/viewthread.php?tid=65514



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[*] posted on 9-3-2016 at 01:32


http://www.sciencemadness.org/talk/viewthread.php?tid=64083#...

Did you look at this thread?

http://www.ebay.com/itm/Gadolinium-Rare-Earth-Metal-Element-...

86 gm for $45 free shipping so this is around half the price you mentioned of $1/gm.


http://www.ebay.com/itm/Gadolinium-Rare-Earth-Metal-Element-...

Another in the 50 cents/gm range.


http://www.ebay.com/itm/100-Grams-99-9-Pure-Gadolinium-3N-El...

~40 cents/gm.

http://www.ebay.com/itm/1139-Grams-99-9-Pure-Gadolinium-3N-E...

A very large piece around 20 cents/gm.


[Edited on 3-9-2016 by IrC]




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Harristotle
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[*] posted on 9-3-2016 at 02:46


Impressive. Really impressive.
That video has made my day.

Cheers,
H.
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