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Stone as Heatsink
Stone as Heatsink
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Old 11th January 2018, 09:21 PM   #21
GoatGuy is offline GoatGuy  United States
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Scott: it does not matter. The stone is a near-worthless thermally conductive material for heat sloughing.

It remains: DO NOT USE STONE as a heatsink.

CAn't be simpler, all the discussion aside.
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Old 11th January 2018, 09:37 PM   #22
johnnyx is offline johnnyx  United Kingdom
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There are doubters, but alumina ceramic works.
Siemens use them in Sitop 3 phase power supplies; (URL="https://uk.rs-online.com/web/p/thermal-gap-pads/1777773/"][/URL]
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Old 11th January 2018, 09:46 PM   #23
scottjoplin is offline scottjoplin  Wales
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I don't think anyone is doubting it. Unless you think it bears a resemblance to stone?
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Old 11th January 2018, 09:52 PM   #24
GoatGuy is offline GoatGuy  United States
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Quote:
Originally Posted by johnnyx View Post
There are doubters, but alumina ceramic works.
Siemens use them in Sitop 3 phase power supplies; (URL="https://uk.rs-online.com/web/p/thermal-gap-pads/1777773/"][/URL]
No… doubt. Fused alumina offers 30 W/(m⋅K);
Copper 401
Silver 450
Aluminum 205
Granite 2.5
Basalt 3.3

All these available between engineeringtoolbox . com and https://pubs.usgs.gov/of/1988/0441/report.pdf

Anyway. Don't use stone.

You might be able to get away with using fused alumina, but it is frighteningly expensive in big blocks. And its not a rock, per se - but a man-made engineering material.

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Old 11th January 2018, 10:03 PM   #25
jcx is offline jcx  United States
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Ruby, Sapphire are natural Al2O3, both are also made industrially as single crystals - 'Sapphire' often used as the name for the colorless manmade crystal
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Old 11th January 2018, 10:10 PM   #26
GoatGuy is offline GoatGuy  United States
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JCX good point dude!
That's the solution then. Buy blocks of sapphire or ruby, and turn the into heat sinks.
Right?

… apart from the cutting-and-polishing problem
… and the humungous heat-of-fusion problem
… and the boules tend to explode problem
… and the inability to anneal problem
… and the crispness problem
… and the cost problem

Perfect!
Sigh.

Sheesh.
GoatGuy
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John Curl's Golden Rule…: 100 kHz bandwidth, 3 μs risetime, 100 W mean output, 100 V/μs slew rate, 2 Ω dynamic load, 20 amp min current source/sink

Last edited by GoatGuy; 11th January 2018 at 10:21 PM.
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Old 12th January 2018, 12:43 AM   #27
jcx is offline jcx  United States
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Default what would Bezos do?

LANCE Large Area Sapphire | Rubicon Technology seem to make some reasonably sized slabs

Last edited by jcx; 12th January 2018 at 01:08 AM.
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Old 12th January 2018, 01:07 AM   #28
chrisb is offline chrisb
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Cost and machinablity factors aside, where precisely is that material attributed with the type of thermal conductivity properties that would make it suitable to the application under discussion?
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Old 12th January 2018, 01:09 AM   #29
CharlieLaub is offline CharlieLaub  United States
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Quote:
Originally Posted by scottjoplin View Post
Was the OP serious? He hasn't been back. Is anyone else here serious? As well as getting a very smooth and fine contact between surfaces so as not to use too much thermal grease whose only function is to eliminate air gaps, pressure is the other important factor in thermal transfer, how are you going to attach the aluminium to the stone tightly without it cracking due to expansion and contraction?
Maybe OP realized it was a dumb idea and has moved on? Or maybe he was just trolling and is laughing at all of us getting into a tizzy about this topic and posted on purpose to draw in certain types of people.

Hey, if the stone is heavy, just lay it on top. Plenty of contact force will be generated!
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Old 12th January 2018, 01:09 AM   #30
jcx is offline jcx  United States
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Quote:
Originally Posted by chrisb View Post
Cost and machinablity factors aside, where precisely is that material attributed with the type of thermal conductivity properties that would make it suitable to the application under discussion?

admittedly Sliver bullion bars would be cheaper and better - large pices of native silver are a bit pricier than bullion

Last edited by jcx; 12th January 2018 at 01:14 AM.
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