Thermally conductive, electrical insulator
Thermally conductive, electrical insulator
(OP)
I'm sorry for double posting this, as I've already posted this question in the Metallurgy forum; however, this may be a problem who's solution is a polymer.
I'm interested if there is a material I can use in a 1/2" thick piece I have, that will dissipate heat (it is up against a cold plate), yet will electrically insulate. Can anyone recommend anything?
I found a polymer composite with boron nitride coated carbon flakes, but this requires a mold. This piece must be tapped for bolts! I have attached a picture of the part, and where it is mounted, if this helps...
Thank you all.
-Kevin
I'm interested if there is a material I can use in a 1/2" thick piece I have, that will dissipate heat (it is up against a cold plate), yet will electrically insulate. Can anyone recommend anything?
I found a polymer composite with boron nitride coated carbon flakes, but this requires a mold. This piece must be tapped for bolts! I have attached a picture of the part, and where it is mounted, if this helps...
Thank you all.
-Kevin





RE: Thermally conductive, electrical insulator
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers for professional engineers
RE: Thermally conductive, electrical insulator
If you need lower thermal conductivity and lower cost then use the fillers used in thermal paste.
Alumina Al2O3 or
Hexagonal Boron Nitride
Chris DeArmitt
RE: Thermally conductive, electrical insulator
You might be lucky as I guess you only need one piece of material: http://www.coolpolymers.com/
Otherwise fused quartz, which you have a bit of difficulty tapping!
What is wrong with a slab of aluminium with silicone heat transfer gaskets between and nylon fasteners?
Cheers
Harry
www.tynevalleyplastics.co.uk
RE: Thermally conductive, electrical insulator
Now firmly locked away in the memory banks.
Kevin
It will require a mould, even if it is a real simple prototype mould that is a bit big and you them machine the moulding to finish it.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers for professional engineers
RE: Thermally conductive, electrical insulator
Also important to note is that the dispersion of the filler and its shape have a huge effect on the thermal conductivity.
Chris DeArmitt
RE: Thermally conductive, electrical insulator
"Unlike most electrical insulators, diamond is a good conductor of heat because of the strong covalent bonding within the crystal."
"Monocrystalline synthetic diamond enriched in 12C isotope (99.9%) has the highest thermal conductivity of any known solid at room temperature: >30 W/cm·K [ref] five times more than copper"
Chris DeArmitt
RE: Thermally conductive, electrical insulator
RE: Thermally conductive, electrical insulator
A nylon, or other electrically isolating fastner with standoffs seems to be the direction I'm leaning, but if I could find a material that is cheap and easily machinable with the properties I need (this almost seems like an oxymoron), it would be even better. Being naive in the matter, that is why I came here.
Chris, would the part be made solidly out of Alumina, or would it be used as an external coating on an Aluminum piece? If so, could it be applied to the fastner threads?
I am interested in using some coatings on aluminum, or as others have suggested in another thread, using Mica sheets. My problem is the electricity still flowing through the threading and fastner.
RE: Thermally conductive, electrical insulator
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+ Alloy spacer
Fixed with something like these:
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?
Cheers
Harry
www.tynevalleyplastics.co.uk
RE: Thermally conductive, electrical insulator
RE: Thermally conductive, electrical insulator
http://en.wikipedia.org/wiki/Beryllium_oxide
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