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[ES] Micro Porous Ceramic Heatsinks - Page 2

post #11 of 20
Quote:
Originally Posted by SimplyTheBest View Post
THey use them for Car Brakes so Im sure they handle heat very well. Ever hear of Brambo?
No, though I do know of Brembo...
So sexy it Hz
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So sexy it Hz
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post #12 of 20
I will be eagerly awaiting this!
post #13 of 20
I have to wonder how well these transfer heat. The have a very low thermal capacity which means it might have trouble making the heat travel far away from the source. The strength of copper heatpipes and aluminum fins is that they can have incredible surface area because the heat travels along the surfaces of the IHS.
post #14 of 20
LOL masterFire, You win : )
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post #15 of 20
Quote:
Originally Posted by mothergoose729 View Post
I have to wonder how well these transfer heat. The have a very low thermal capacity which means it might have trouble making the heat travel far away from the source. The strength of copper heatpipes and aluminum fins is that they can have incredible surface area because the heat travels along the surfaces of the IHS.
copper heatpipes + ceramic fins?

Or like ASUS does, metal coated in ceramic
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post #16 of 20
Quote:
Originally Posted by mothergoose729 View Post
I have to wonder how well these transfer heat. The have a very low thermal capacity which means it might have trouble making the heat travel far away from the source.
actually, this is a good. the lower the heat capacity, the more heat it can remove from the chip. having a low heat capacity means that the flow of heat energy is faster, hence why high performance rotors for race cars and such are made out of ceramic, or ceramic carbon. because they dissipate heat so quickly, they don't fade in braking performance

Heat capacities (lower is better):
Aluminum: 0.900 J/(g * degrees celcius)
Copper: 0.385 J/(g * degrees celcius)
Mercury: 0.138 J/(g * degrees celcius) mercury vapour is actually used in heat pipes for SOME heatsinks.
Gold: 0.129 J/(g * degrees celcius) (i wish XD) the McLaren F1's engine was lined with gold for a reason also, gold is the ELEMENT with the lowest heat capacity.

Unfortuantely, my Chemistry text book doesnt tell me anything about compounds like ceramic :/ and im too lazy to google

the reason why watercooling is more effective than standard heatsinks...is a little more complicated ;p

EDIT: heat capactity of liquid water: 4.18 J/(g * degrees celcius)
Edited by Driftingnfsc3 - 12/23/10 at 10:30pm
    
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post #17 of 20
http://www.substech.com/dokuwiki/dok...es_of_ceramics


Anyways, I never feel these things getting very hot... and usually only see them on southbridges and network controllers in conjunction with thermal adhesive. Make them too large and shipping becomes a concern. I'll trust metal even with adhesives.
post #18 of 20
Quote:
Originally Posted by SimplyTheBest View Post
THey use them for Car Brakes so Im sure they handle heat very well. Ever hear of Brambo?
Brembo
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post #19 of 20
Quote:
Originally Posted by SimplyTheBest View Post
THey use them for Car Brakes so Im sure they handle heat very well. Ever hear of Brambo?
Brembo. Btw, I have Carbon Ceramic brakes on my car... Which is a Continental GT.
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post #20 of 20
Quote:
Originally Posted by mothergoose729 View Post
I have to wonder how well these transfer heat. The have a very low thermal capacity which means it might have trouble making the heat travel far away from the source. The strength of copper heatpipes and aluminum fins is that they can have incredible surface area because the heat travels along the surfaces of the IHS.
Ceramics have definite advantages when it comes to heat, judging by say, the tiles on the Space Shuttle. When it comes to a processor, heat does not have to travel far away from the source, it just has to travel away from the processor itself, to keep it as cool as possible.

I think the disadvantage to ceramics comes down to costs. Ceramics are not easily machined - certainly not like the ease at which aluminum or copper can be worked. This drives up costs, and also means Ceramics have to have a very rigourous manufacturing process, because any advantage is nullified if the mating surface is not exact. With aluminum (or copper), making a flat face is easy-peasy, the final machining step on a CNC Mill with the appropriate cutter.

However, ceramics may really make an inroad in certain applications, especially with higher heat devices that may not be well serviced by aluminum or copper because of heat induced warpage that could lead to device failure. They may also be able to right size ceramics, rather than being constrained to adding bulk to provide the needed overkill for the worst case situations. The issue of surface area is very interesting, because it would be difficult to create a similar structure in say, aluminum, and still have structural integrity. Heat sinks could be smaller, more efficient, and more able to handle high heat stress loads - and this would be a major benefit in high end stuff, like Blade servers, where you really have a lot going on in a tiny space - and always stuffed into some overly hot IT closet with a ton of other heat belching equipment.
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