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Effect of paint on thermal conductivity?

post #1 of 9
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Just wondering whether painting something like a heatsink will hurt the thermal conductivity of the material. Would I need to use a special kind of paint?
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post #2 of 9
It will definately negatively affect the thermal-transfer and I would not reccomend it.
post #3 of 9
Yes, it will affect the performance.
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post #4 of 9
Yup, it would quite seriously affect temps. Don't!
post #5 of 9
Quote:
Originally Posted by cathode View Post
Just wondering whether painting something like a heatsink will hurt the thermal conductivity of the material. Would I need to use a special kind of paint?
Depends on the color and type of paint ;-P
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TK-421
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post #6 of 9
Quote:
Originally Posted by jacksknight View Post
Depends on the color and type of paint ;-P
regardless it will negatively affect the heat dissapative efficiency of the heat sink. Think of the paint as a shell over the heat sink, it hinders the heat escape

painting a heat sink = fail
I am even leary of them powder coated ones from the factory
f that, bare open metal or bust
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post #7 of 9
Aluma black (https://www.birchwoodcasey.com/store/antiquing.html) puts a very thin oxide coating on aluminum. I don't think it would noticeably affect the heat transfer properties of the HS.
    
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post #8 of 9
Any flatblack paint would work fine like krylon. You would have little to no change in temps. Also some marine enamel paints can contain up to 75% pure copper. one quart of paint can weight 5 to 10 pounds..
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post #9 of 9
Painting the fins of the heatsink will certainly decrease the effective heat transfer capabilities. This is attributed to 3 factors; namely: a) the additional thermal interface between the fins and paint, b) the heat transfer through the paint, and c) different heat transfer coefficient from the paint to the air compared to that from the bare metal to the air
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