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Why is Mayonaisse such a good heat transfer thermal compund? (at least for the first 12h)

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September 1, 2013 11:05:39 AM

SO i was looking at this: http://www.hardwaresecrets.com/article/Does-Mayonnaise-...
And i'm very curious. http://www.hardwaresecrets.com/imageview.php?image=4308...
Makes me wonder if mixing mayo, some cheap gray silicone chinese thermal comp and micro copper dust (my father always has some laying around from the lab, high quality too) would net me even greater results :) 
a c 345 à CPUs
September 1, 2013 11:25:42 AM

The purpose of tim is to fill in microscopic pits in the mating surfaces so air does not get trapped.
tim is actually an insulator, so the less used the better.
Many such things work, but I suspect that they may be volatile and lose their effectiveness.
tim is so cheap, just use whatever purpose made tim you have available.
There is not a great deal of difference in cooling from the best to the worst.
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a b à CPUs
September 1, 2013 11:25:48 AM

The oil.
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a c 190 à CPUs
September 1, 2013 11:58:52 AM

Fernandoemh said:
SO i was looking at this: http://www.hardwaresecrets.com/article/Does-Mayonnaise-...
And i'm very curious. http://www.hardwaresecrets.com/imageview.php?image=4308...
Makes me wonder if mixing mayo, some cheap gray silicone chinese thermal comp and micro copper dust (my father always has some laying around from the lab, high quality too) would net me even greater results :) 


It's all about thermal conductivity.

Metals are great thermal conductors. Air is a pretty crappy thermal conductor. Vacuum is even worse. Most liquids are in the middle.

Mayo has a high milk fat and vegetable oil content. Fat and vegetable oil are reasonably viscous so they won't flow away from the air gap that thermal paste is meant to fill.
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September 1, 2013 12:06:27 PM

would mixing high density silicone thermal grease (>3.2) and mayo be any good? would the oil evaporate through time or could i get it to mix well together and ensure good performance?

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a c 190 à CPUs
September 1, 2013 12:43:16 PM

Fernandoemh said:
would mixing high density silicone thermal grease (>3.2) and mayo be any good? would the oil evaporate through time or could i get it to mix well together and ensure good performance?



The oil will go rancid over time. It will also separate and possibly leak down into your PCB. Use proper thermal paste
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