Painted Heat Sinks

Montie · 2005-11-28T13:34:49+00:00

Morning,Have you had any experience with painted heat sinks? I have a customerwho would like a painted finish and I'm having a hard time finding thethermal conductivity of paint so I can calculate what the thermaleffect would be.Any suggestions?Thanks,MontieMontie Design

Nov 28, 2005 43 Replies

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Dave 20 years ago

Models with those figures appear to have very low tolerances and are more prone to (thermal) run-away, best to go for a more stable, slightly over-engineed model which can take the heat.

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Adrian Tuddenham 20 years ago

How about a mermaid: 36 - 24 - 1/6d a pound.

~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk

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montie 20 years ago

Evening All,

Thanks for everyone's help.

The diecast cover I'm making has the following requirements:

1) serve as a finned heat sink on the outside 2) have a selection of colors available (hence the push towards painting) 3) have electrically conductive surfaces on the inside (for EMI/RFI gasketing)

The die casting house is telling us that the only colors they can anodize (because of the aluminum allow being used) is dirty grey and black. The client wants something more colorful.

Assuming that paint is the answer, the order of operations for the part is:

1) yellow chromate the part 2) mask the areas that need to be electrically conductive 3) paint the cover

Any suggestions here? At this point we plan to use a powder coat finish. Any suggestions of paints that are more thermally conductive?

Thanks, Montie

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