Copper, aluminim sp?

[Punkmasterflick]

So far copper is the best, minus silver, do to cost, what about titanium? Is it the density that makes for a better transfer of heat? 'cause copper and silver for that matter has nothing on titanium... understandably not the average person could make a titanium block, do to it's hardness. just something to think about.

[Sonny]

If you click on the http://forum.oc-forums.com/vb/images/top_search.gif (http://forum.oc-forums.com/vb/search.php?s=) you are sure to find a good amount of threads talking about the materials you asked about.

[Namagomi]

See previous answer. Search is a very good thing.

[Punkmasterflick]

sorry...:eh?:

[Sonny]

No need to apologize:beer: New Members probably don't know that there is a search tool so I just pointed it out to you;)

[Punkmasterflick]

no no, i knew about it :) i just didn't think about using it.

[Punkmasterflick]

hey i did a search for it, would you mind pointing me in the right direction?

[Gnufsh]

Basically, we want to get heat away from the processor as fast as possible. Materials that have a higher thermal conductivity are better at moving heat.

You can find a table here:


http://hyperphysics.phy-astr.gsu.edu/hbase/tables/thrcn.html

or in just about any decent physics book.

There are some other important factors here too, but I'm far too tired to type them up.

[Sonny]

LOOK HERE (http://forum.oc-forums.com/vb/showthread.php?s=&threadid=115358) at what I found after doing a search.

Originally posted by Silversinksam
What more can I add ??

OK I'll just add the thermal properties of materials for good measure ;)

Thermal Properties of Materials

Thermal Conductivity, W/cm-K

Metals

Aluminum 2.165
Beryllium 1.772
Beryllium-copper 1.063
Brass 70% copper, 30% zinc 1.220
Copper 3.937
Gold 2.913
Iron .669
Lead .343
Magnesium 1.575
Molybdenum 1.299
Monel .197
Nickel .906
Platinum .734
Silver 4.173
Stainless Steel-321 .146
Stainless Steel-410 .240
Steel, low carbon .669
Tin .630
Titanium .157
Tungsten 1.969
Zinc 1.024
Semiconductors
GaAs .591
Silicon (pure) 1.457
Silicon (.0025 ohm-cm) .984

Silicon Dioxide (amorphous) .014
Silicon Dioxide (quartz) c-axis .11
Silicon Dioxide (quartz) a-axis .059
Silicon Nitride .16 - .33
Silicon Carbide .90
Insulators
Air (still) .0003
Sapphire c-axis .35
Sapphire a-axis .32
Alumina .276
Alumina 85% .118
Beryllia 99.5% 1.969
Beryllia 97% 1.575
Beryllia 95% 1.161
Boron Nitride (hot pressed) .394
Diamond (room temperature) 6.299
Diamond (77 K) 24.
Diamond (room temperature, isotopically pure) 50.
Epoxy .002
Thermally conductive epoxy .008
Glass .008
Heat sink compound (metal oxide loaded grease) .004
Mica .007
Mylar .002
Phenolic .002
Silicone Grease .002
Silicone Rubber .002
Teflon .002
FR-4 or G-10 PC board material .003
water .0055
Liquid Helium (4.2K) .000307
Liquid Nitrogen (77K) .001411
Liquid Argon (85K) .001258
Thermally Conductive Elastomers
Bergquist Sil-pads .009
Tecknit Consil-C 871 .023
Tecknit Consil-R 350 .00433 to .00732
Saracon 2.9e-3 cal/cm-sec-K
Chomerics XTS-274 alumina filled elastomer .002 cal/sec cm K
Cho-seal 1224 .038
Cho-therm .0433
Cho-therm 1678 .018
Cho-therm 1671 .027

[Punkmasterflick]

This doesn't exactly answer my question, all i want to know if density affects the transfer of heat...

[Punkmasterflick]

i have no idea what those numbers mean.
the higher the better?

[Serraph]

Ummm yeah basically higher is better. Too lazy to go look in my Physics book that's 2 feet away from me what "w/cm-k" is but I'm pretty sure that it's watts per centimeter Kelvin. As you can see copper is a good thermal conductor and titanium is not.

[AC Slater]

Ok one of you make me a heatsink out of Diamond (room temperature, isotopically pure) and then we'll see how high I can overclock.

[doc]

To answer your question. No, the density does not affect the transfer of heat in a steady state.

[Diggrr]

It's not just the density of the object, but the atomic structure that aids conducting heat. Otherwise, lead and gold would be better than copper, but they are not.

Diamond would be nice, as long as someone else paid for it! :D

[Gnufsh]

If density was very important, we'd all be using depelated uranium HSF's. Cancer, what's that?

[Punkmasterflick]

haha, ok. thank you :)

[Silversinksam]

Originally posted by Gnufsh
If density was very important, we'd all be using depelated uranium HSF's. Cancer, what's that?


That wouldn't be so good since Uranium has W/cmK of 0.276

The only practical use of depleted Uranium is
for casings of armor piercing arterial shells, armor plating on tanks and as ballast in the wings of some large aircraft ;)

[AntmanMike]

Diamond is a good thermal conducter THRU A SINGLE PARTICLE, but because its molecular shape includes many sharp angles, it is not good for transferring heat from particle to particle. That is why we do not see Arctic Diamond, and diamond heatsinks. MMM... depleted uranium :). I eat it for breakfast :)