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Has anyone made a silver pot? - Page 2

post #11 of 13
Quote:
Originally Posted by nolonger View Post

Quote:
Originally Posted by K404 View Post

Here is a chart showing thermal conductivity Vs (cryogenic) temperature for aluminium
http://reference.lowtemp.org/alkappa.html
Yea, it's a different metal but the important bit is to know that thermal conductivity changes as a function of temperature. Different metals have different curves. Very few charts are linear, some appear VERY random.
Just because silver is better than copper at +50c or similar, means truely NOTHING for LN2 or LHe.
Somewhere out there (i'm looking) there are charts for different grades of silver and copper.
I am *reasonably* sure that the charts will show that the performance between the two is close enough that there is absolutely no reason to make a silver LN2 pot.
So... to answer your question, no-one has made one because of money smile.gif
EDIT: GOT IT!
Chart for copper:
http://www.efunda.com/materials/elements/TC_Table.cfm?Element_ID=Cu
Chart for silver:
http://www.efunda.com/materials/elements/TC_Table.cfm?Element_ID=Ag
At -196c (77K) (the charts have an entry for 80K so i'll use that)
Silver: conductivity of 471W/mK
Copper: conductivity of 557W/mK
So.... with LN2 silver is performing WORSE and costs a lot more. If we were to use LHe, silver is pretty terrible.

Doesn't a lower W/mK mean it takes less heat to produce a temperature difference? That would mean silver is less resistant to temperature changes, therefore being a better heat conductor.

Air has a Thermal Conductivity of 0.024 W/mK at 25C. By your logic we should OC without any heatsink. smile.gif
post #12 of 13
ohhh so thats what weve been doing wrong all this time
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post #13 of 13
Assuming with go with one of the smallest/lightest DICE/LN2/LHe pots... Something like the Koolance V2, or an older Duniek.... Those pots come in at about 1.5 Kgms with the base part being about 70% to 80% of the total mass...
So we're talking about getting about 1000 gms of silver for the pot or ~36 ounces. of finished product... You would need to purchase enough stock so that your final piece is 36oz.... Say something like your silver bar should be 3 1/2" in diameter and 4" in height so that you could then machine out the piece. If I were to guess; I'd say the initial stock bar would be in the area of 40 to 50 oz of silver... So we're talking of spending $1500+ on that alone and then we have to pay someone to machine the thing for us. Simply not cost effective.
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