Machinable Material with low thermal conductivity
Machinable Material with low thermal conductivity
(OP)
Is there a cost effective material alternative to aluminium which is machinable, but has a low thermal conductivity.
Currently prototyped a component machined from a hardened block of JB Weld.
It would be an advantage to purchase a material which is already in block form and could stand up to 700 Deg F.
The material does not need to conduct electricity, but should have about the same hardness / strength as Al.
Currently prototyped a component machined from a hardened block of JB Weld.
It would be an advantage to purchase a material which is already in block form and could stand up to 700 Deg F.
The material does not need to conduct electricity, but should have about the same hardness / strength as Al.





RE: Machinable Material with low thermal conductivity
How low does the thermal conductivity need to be? Titanium has less than 1/10th the conductivity of Al.
If you really want a polymer, and with a 700 deg F temp, you are looking at stout ones like epoxy, PPS, PEEK, etc. These are available as shapes from various vendors.
Regards,
Cory
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RE: Machinable Material with low thermal conductivity
Have you tried concrete.
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RE: Machinable Material with low thermal conductivity
Titanium is a bit expensive.
Looking for blocks, 2" X 4" X 4".
PPS and PEEK have too low of melting point (<500 Deg F)and/or or get too expensive for more exotic compositions, otherwise ok.
Epoxy is essentially what we are using for prototype, as mentioned, however has a thermal operating range of ~550 Deg F.
Patprimmer,
Concrete is not very machinable and hardwood... does not hold up to 700 Deg F.
Thanks for the contributions, the search goes on.
RE: Machinable Material with low thermal conductivity
http://www.ecsceramics.com/cercoa/ceramics.html
TTFN
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RE: Machinable Material with low thermal conductivity
Corning's MACOR should be considered
low thermal conductivity, excellent electrical insulator,
thermally stable to about 1000C and machinable
how strond must it be?
aluminum silicate is good but possibly too soft
RE: Machinable Material with low thermal conductivity
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RE: Machinable Material with low thermal conductivity
http://www.cotronics.com/vo/cotr/cm_machinable.htm
Sintered boron nitride (not crystalline) is low conductivity and quite machinable also.
RE: Machinable Material with low thermal conductivity
I am awaiting pricing information and hope that the cost is not prohibitive.
There is always concrete as a backup option(lol)!
RE: Machinable Material with low thermal conductivity
The other important questions are the loads on the part and service life needed. Thermal stresses will be a big factor on part life.
RE: Machinable Material with low thermal conductivity
In the process of prototype development, however we need a solution which is cost effective and manufacturable, so that when the design transitions to production, we are not limited by an exotic solution.
Thanks for your contribution