Black Heatsinks

[nativepaul]

Have a look in the store folks, Mike is now selling XL clamp/heatsinks in black!

Is that type II or type III anodizing?

[jollyjumper]

could you explain type's of anodizing?
thank you, mike.

[nativepaul]

Err, it's the black type.

[jollyjumper]

no i mean type 2 or type 3.

[BrianG]

Cool! Black heatsinks. I wonder if they'll cool better (black body radiation)?

Originally Posted by BrianG

Cool! Black heatsinks. I wonder if they'll cool better (black body radiation)?

I can confirm they do in fact work better. how much of course depends on what's around them.

[jnev]

Can someone post a link to it? I can't find it.:002:

[BrianG]

Originally Posted by ***RC***

Can someone post a link to it? I can't find it.:002:

XL Black Heat Sink

You have to bring up the drop-down list (last option)...

Type III is hard anodizing, like they use on military stuff and the green Surefire flashlights. Type II is not as tough and will wear away more quickly, it's used on Maglites. Type II is probably the most common, since you can get it in lots of different colors.

The thing I don't like about anodizing is that it gets dinged up, sooner or later and then it looks like crap. Type III is just a lot less likely to get dinged up.

For a heat sink I'm guessing the dings will be limited. And one could always grab the trusty sharpie out of his sock to hide the dings :)

[jnev]

Thats so funny cadima.

Thanks for the link Brian.

OK, I forgot about the sharpie trick.

I don't know about color helping with the heat dissipation, but I'm wondering if the relatively rough surface of the anodizing will inhibit the conduction of heat from the motor to the sink. As it is, there is already the hurdle of the anodizing on the motor can.

In any case, the black heatsink would look cool.

Originally Posted by AAngel

OK, I forgot about the sharpie trick.

I don't know about color helping with the heat dissipation, but I'm wondering if the relatively rough surface of the anodizing will inhibit the conduction of heat from the motor to the sink. As it is, there is already the hurdle of the anodizing on the motor can.

In any case, the black heatsink would look cool.

I was testing a griddle protoype at work (yes, the type of griddle for cooking pancakes) and the protoype was plain milled Aluminum. It was running about 650 F for the test. When I got the black teflon coated version later on, it was 550 F max under identical circumstances. The only difference was the black coating. It does make a difference. But at our temps, I'd probably guess about 5-8% improvement.:032: Still, better than nothing.

[BrianG]

IIRC, anodizing is a molecular plating of sorts, so it should provide little to no barrier to heat transfer. It's not like it was powder coated or painted. As to the rough surfaces, I suppose you could wet sand the inside of the sink to remove the anodizing there, but I personally wouldn't. I think a little heatsink compound when installing it will help greatly in heat transfter - just don't get the cheap stuff as it's kinda oily because it'll ooze. I'd use something like Ceramique, which is a thicker paste.