Arctic Silver 5

[Jon P. Inghram]

For the love of god and all that is thermaly conductive, here's a chart of the thermal conductivity of silver from ABSOLUTE ZERO TO NINE HUNDRED AND TWENTY SIX POINT EIGHT FIVE DEGREES CELSIUS!

http://www.efunda.com/materials/elements/TC_Table.cfm?Element_ID=Ag

(Just subtract 273.15 to get celsius.)

[Brian R.]

What about copper?

[cjolley]

Originally posted by Brian R.
What about copper?

Nobody uses that cheap sh*t anymore.
We've all moved on to Silver.
chuck

[Jon P. Inghram]

That site wants you to register to get the specs on copper, wierd.

Ah, they put a cookie on your system that tries to block access after a few uses! How nice of them.

[cjolley]

I got to Cu & Au just by changing the link.
chuck

[Jon P. Inghram]

Previous contents deleted due to deletion of post that this post previously responded to.

[Brian R.]

Sorry, deleted the post. Not serious anyway...

[Greebe]

Now that my data is suspect(oh my), where's your logic in using Pb or Sn or a mix of the two?

Just curious

[cjolley]

Originally posted by Greebe
Now that my data is suspect(oh my), where's your logic in using Pb or Sn or a mix of the two?

Just curious

Oh come on Greebe,
At 7 or 8°k Pb is very comparable to these other materials at room temp.
You just need to keep the environment cooler.
chuck

[Brian R.]

Stay curious. You will be ignored.

Chuck - A thin foil of a metal should minimize the difference in thermal conductivities since the actual resistance to heat flow is proportional to thickness. A softer metal with a lower thermal conductivity may do a better job (in a foil) than a harder metal with a higher conductivity since the softer one may conform to surface irregularities better. This effect may make up for differences in thermal conductivity.

BTW, I have no idea where Greebe came up with use of alloys. I sure didn't propose that. He must have had a brain fart.

[Greebe]

Just as I suspected, a frozen tongue on the flagpole doesn't prove anything

[Greebe]

But at the same time Brian you have added an additional boundry layer which negates additional benefit.

[cjolley]

Originally posted by Brian R.
Stay curious. You will be ignored.

Chuck - A thin foil of a metal should minimize the difference in thermal conductivities since the actual resistance to heat flow is proportional to thickness. A softer metal with a lower thermal conductivity may do a better job (in a foil) than a harder metal with a higher conductivity since the softer one may conform to surface irregularities better. This effect may make up for differences in thermal conductivity.

I had wondered about that.
Particularly with reference to a very low mp solder.
Aren't there solders that melt at nearly room temp?
What would be the effect of a solder that was liquid at the temp the cpu core was running at?
Or would it simply run out of the tiny gap between the cpu and the hs?
chuck

[Greebe]

it would seep out

the lowest temp solders available are typically in paste form and melt @ around 270f

/edit added info

[cjolley]

Originally posted by Greebe
it would seep out

What woould happen if you could seal it in, say with a narrow bead of superglue around the edges?
What would be the practical problems with running the cpu up to temp to let the hs settle on the cpu and then sealing it up?
chuck

PS We are already way into the hobbyist zone here, so production practical and possible practical are two different things.