Carbon fiber reinforced carbon with LOW thermal conductivity
Carbon fiber reinforced carbon with LOW thermal conductivity
(OP)
Hi folks,
I want to find the CFRC with low thermal conductivity. Most CFRCs are imporved to have high thermal conductivity so I am wondering how much is the least conductivity it can have and where I can get them. Thanks
I want to find the CFRC with low thermal conductivity. Most CFRCs are imporved to have high thermal conductivity so I am wondering how much is the least conductivity it can have and where I can get them. Thanks





RE: Carbon fiber reinforced carbon with LOW thermal conductivity
Rayon based carbon fiber is used in rocket nozzles and ablatives because the thermal conductivity is lower than PAN-based. Using a syntacic foam core in a laminate will reduce thermal conductivty through the thickness.
Fiberglass has lower conductivity than carbon.
RE: Carbon fiber reinforced carbon with LOW thermal conductivity
RE: Carbon fiber reinforced carbon with LOW thermal conductivity
Also the thermal conductivity of glass actually increases a lot as you heat it so it may pretty high at 1000C.
Shorter fibres will lower the conductivity but decrease modulus and strength.
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RE: Carbon fiber reinforced carbon with LOW thermal conductivity
RE: Carbon fiber reinforced carbon with LOW thermal conductivity
at 1000 deg C tradtional composite materials will not work. Even more advanced resin systems such as polyimide or BMI have Tg's of only 400 Deg C. But, you may be able to use Carbon-Carbon composites which have the resin burned off and infiltrated with carbon. C-C can maintain strengths of 250 to 400 Mpa up to temperatures of 1800 deg C. But, due to the fibers and matrix having higher thermal conductivties, C-C has typical in-plane k values of 50 W/mK for Pan fibers and up to 250 W/Mk for pitch based fibers. But, thru thickness and across ply are usually less than 5 W/mk. Hope this helps and good luck,
J-Mo
RE: Carbon fiber reinforced carbon with LOW thermal conductivity
RE: Carbon fiber reinforced carbon with LOW thermal conductivity
Another approach is to combine an insulator layer with a structural layer.
RE: Carbon fiber reinforced carbon with LOW thermal conductivity