Thermal conductivity of thermoplate (copper/aluminum) what to choose?

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illiaY2017-05-26 10:56:15

Iron

illiaY, 2017-05-26 10:56:15

I have a hp dv5 1177er. The thermal pad on the video chip is dead (torn). I'm thinking of replacing it with a metal plate (of those that are, not specially purchased). The gap is 0.5mm.
From copper (thermal conductivity approx. 400W / m * K) it has not yet been possible to find a suitable plate, with aluminum (thermal conductivity approx. 200W / m * K) there are no problems. But I think that all the same, thermal conductivity will rest against the radiator (which is supposed to be aluminum). Or am I wrong? (this is the first question)
And the second question. Maybe you can somehow firmly fix an aluminum plate to the heatsink, so that the thermal conductivity from the plate to the heatsink is maximum (without thermal paste)? Or grind the surfaces of the plate and the radiator to an absolutely even and identical state?

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4 answer(s)

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illiaY, 2019-07-14
@illiaY

Unfortunately, or maybe fortunately, the question remained purely theoretical. So I did not bother with metal plates. In March 2019 (2 years have passed!!!! but actually even more) I took Arctic MX-4 thermal paste and Arctic Thermal Pad 1mm thermal pad.
Because time is as valuable as money.
Ps: as I later saw enough of the "correct" masters on YouTube - the installation of such non-standard plates leads to chips on the video card crystals (the manufacturer did this for a reason). And there are enough thermoplates for any microcircuits.
Ps: In my case, the fan interfered with the cooling most of all. After the "vedeshki" (such as grease for almost everything), the fan became easier, the noise became two less and the computer seemed to be 2 years younger. True, this is a half measure - the fan needs to be changed. But still, lubricating the fan 1) gave a result, 2) revealed the problem. (CAREFULLY take a lubricant that does not conduct electricity and does not react chemically with fan materials - for example, "ladle", but read the description, you never know what will be mixed in the new batch)

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evgeniy_lm, 2017-05-26
@evgeniy_lm

But I think that all the same, thermal conductivity will rest against the radiator (which is supposed to be aluminum). Or am I wrong?
Not right. Everything rests on the thermal conductivity of thermal paste.
No thermal paste whatsoever.

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Viktor, 2017-05-26
@nehrung

1. Of course, copper, if you have it on hand or where you can buy it. Aluminum only if there is no copper.
2. It is not necessary to fasten tightly, it is enough to ensure minimum gaps on both sides of the plate (ideally, both sides should be close to the mirror surface). In Soviet times, a locksmith, for delivery to the 6th (highest) category, had to use a scraper and a lapping plate to make two steel cubes, in which, if you add any two faces and dip them in kerosene, and then pull them out and separate them, then these faces remained dry . But this is the very ideal, and a velvet file and the thinnest layer of thin thermal paste are enough for you.

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pfg21, 2017-05-26
@pfg21

There is thermally conductive glue, I bought it in a regular computer store.
The thermal conductivity of the paste, gum is several times less than that of aluminum or, especially, copper. therefore, the paste layer should be as thin as possible. without air bubbles.
And it is quite natural that the gasket, due to its thickness, will lose to thermal paste.