vantablack heat sink coating?

[coppercone2]

https://www.eevblog.com/forum/projects/the-performance-of-a-heatsink-with-a-black-surface/25/

So if you anodize the heat sink and add some black dye according to some people in that thread performance is increased by 30% or so.

https://en.wikipedia.org/wiki/Vantablack

Could it be improved if vantablack is grown on a heat sink?


I don't mean the paint. I don't think there is any paint that will improve a heat sink. I meant if you grew it with CVD.

[T3sl4co1l]

By a fraction of a percent, maybe?

And that's a heatsink in free air, open to the surroundings so radiation can escape.

Tim

[coppercone2]

is growing vantablack as simple as super polishing iron/steel, letting it rust and heating it in acetylene at reduced pressure?

like ultra thin flash rust.. or like blued steel?

[ejeffrey]

95% emissivity is pretty easily attainable.  So you are pretty much limited to increasing the radiative component of heat dissipation by a few percent at most, and in the cases where radiative heat transfer is not important it wont do anything.