You might want to try asking Bokers then- they can do that sort of small order, maybe they can do or arrange for the hard (Type III) anodize?
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Thermal conductivity (ceramics)
Jan 02, 2013
71 Replies
Thanks for the link.
They don't list Type III (hard) anodize, but maybe they can do it.
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Oh, is type III what I want? They have one listed. (in a #2 size.)
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A3-BLK
George H.
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That sounds right to me. 7 in stock (I guess over-run from a custom order).
Belleville washers are a win, because you get nearly constant force over a 2:1 range of compression (like 30% to 70%).
Suggestion for anodized Al seconded, but I'd just anodize whatever it's bolted to--otherwise you have two thermal interfaces to worry about. That can be okay if you use the Al washer as a heat spreader as well, but you do have to think about it.
Anodizing soft aluminum (1100-T0) might get you good embedability and surface conformance.
Cheers
Phil Hobbs
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
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What you want is anodizing per MIL-A-8625 Type III Class 1
That's hard anodized, undyed.
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Yes.
http://docimages.assistdocs.com/watermarker/transient/48BC3CCAAA244EADBD19C130E0DE7EE1.pdf
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Default thickness of 0.002", which is pretty good (800V/mil is one number).
Wavy washers are neat, too. Compressive forces can be lower than Bellevilles, and they are less likely to gouge the anodized surface.
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
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We spec 1 mil, blue, for some big heat sinks that we use at 200 volts. Works fine.
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
The ultimate thermal conductor is amorphous diamond, I think. I don't know what the penultimate one is, though. :)
Jon
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I think graphene is better
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-Lasse
Interesting. As a result of your prodding, I found this:
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Jon
I was reading something about some carbon material several years ago when I was fooling around with diamond dust. I was mixing diamond dust with thermal paste or epoxy.
Greg
I should add that I'm not sure of the relationship between the term thermal pyrolytic graphite (TPG) and amorphous diamond, except that one may have more precision than the other term. It's possible, given my ignorance, that TPG is a form of amorphous diamond.
Maybe someone knows this stuff well. Would be interesting to learn how the terms are applied by those working in these fields.
Jon
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c_ma...
mimate
l...
carbon is carbon it is all in the details ;)
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-Lasse
Single crystal:
http://www.sumitomoelectricusa.com/products/heatsinks/sumicrystal.html
Amorphous diamond is coal. ;-)
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I was thinking that Beryllium oxide might be the penultimate. (non-electrical conductor ).
George H.
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