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Stone as a heatsink?

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alexig:
Hi all,

I just pulled a product apart and found that one chip had a stone based material (or something similar) on it as a heatsink ???.

This is the first time I've seen this, is it common and/or just a way to cut costs? This board also had a proper heatsink on a larger chip.






Alex.

scrat:
Could be a ceramic (sintered) material..

sacherjj:
It could impulse heat sink needs and using the thermal mass of the ceramic as a buffer.  I'm not familiar with the heat transfer characteristics of ceramics vs more normal heat sink materials. 

saturation:
Nice, first time I've seen that on a real product.  Read about them, since they are porous and thermally conductive they have more exposed surface area than aluminum.

http://www.electronics-cooling.com/2010/11/micro-porous-ceramic-heat-sinks-enhance-heat-dissipation/

http://www.ceramtec.com/index/products/ceramcool/ceramic-heat-sinks/

I've seen them in some LED bulbs, but thought at first they were insulators.




--- Quote from: scrat on July 20, 2011, 12:39:48 pm ---Could be a ceramic (sintered) material..

--- End quote ---

sacherjj:
Interesting.  Good links, thanks.

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