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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11 years ago
Thermal conductivity (ceramics)
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11 years ago
Thanks for the link.
They don't list Type III (hard) anodize, but maybe they can do it.
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11 years ago
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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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11 years ago
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That sounds right to me. 7 in stock (I guess over-run from a custom order).
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11 years ago
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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11 years ago
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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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11 years ago
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-- Yes. http://docimages.assistdocs.com/watermarker/transient/48BC3CCAAA244EADBD19C130E0DE7EE1.pdf
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11 years ago
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Default thickness of 0.002", which is pretty good (800V/mil is one number).
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11 years ago
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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11 years ago
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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
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11 years ago
The ultimate thermal conductor is amorphous diamond, I think. I don't know what the penultimate one is, though. :)
Jon
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11 years ago
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I think graphene is better
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-Lasse
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11 years ago
Interesting. As a result of your prodding, I found this:
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Jon
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11 years ago
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
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11 years ago
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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11 years ago
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11 years ago
c_ma...
mimate
l...
carbon is carbon it is all in the details ;)
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-Lasse
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11 years ago
-- Single crystal: http://www.sumitomoelectricusa.com/products/heatsinks/sumicrystal.html
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11 years ago
Amorphous diamond is coal. ;-)
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11 years ago
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I was thinking that Beryllium oxide might be the penultimate. (non-electrical conductor ).
George H.