CNT-INFUSED CERAMIC FIBER MATERIALS AND PROCESS THEREFOR
A composition includes a carbon nanotube (CNT)-infused ceramic fiber material, wherein the CNT-infused ceramic fiber material includes: a ceramic fiber material of spoolable dimensions; and carbon nanotubes (CNTs) bonded to the ceramic fiber material. The CNTs are uniform in length and uniform in distribution. A continuous CNT infusion process includes (a) disposing a carbon-nanotube forming catalyst on a surface of a ceramic fiber material of spoolable dimensions; and (b) synthesizing carbon nanotubes on the ceramic fiber material, thereby forming a carbon nanotube-infused ceramic fiber material.
1 . A system for the continuous production of carbon nanotubes on a ceramic fiber material comprising:
a catalyst application station comprising a colloidal solution of CNT growth catalyst nanoparticles; and
a CNT growth station comprising at least one purge zone and a growth chamber; said growth station adapted for CNT growth on the ceramic fiber material by continuously feeding the ceramic fiber material through the growth station;
said system being capable of reel to reel growth of CNTs on the ceramic fiber material continuously by providing a payout bobbin and an uptake bobbin; said ceramic fiber material being provided in spoolable form.
2 . The system of claim 1 , wherein said CNT growth station is open to, but separated from the outside environment by the use of an inert gas flow.
3 . The system of claim 1 further comprising a payout and tensioner station.
4 . The system of claim 1 further comprising a fiber spreading station.
5 . The system of claim 1 further comprising a plasma station adapted to roughen the surface of the ceramic fiber material.
6 . The system of claim 1 further comprising a barrier coating station adapted to conformally deposit a barrier coating on said ceramic fiber material; said barrier coating having CNT growth catalyst embedded therein.
7 . The system of claim 5 , wherein the catalyst application station and barrier coating station are combined.
8 . The system of claim 5 , wherein said barrier coating station comprises at least one of spin-on glass, an alumina, a silane, an alkoxysilane, and a liquid ceramic.
9 . The system of claim 1 further comprising a fiber sizing removal station.
10 . The system of claim 1 further comprising a resin application station downstream of said CNT growth station.
11 . The system of claim 1 which is capable of operating speeds in a range from between about 0.5 ft/min to about 36 ft/min.
12 . The system of claim 1 further comprising a controller station; said controller station capable of controlling at least one of linespeed, an inert gas flow rate, a carbon feedstock flowrate, temperature in the CNT growth chamber, temperature of the inert gas, and temperature of the carbon feedstock gas.
13 . The system of claim 1 , wherein a material residence time in the growth chamber between about 5 to about 30 seconds produces CNTs having a length between about 1 micron to about 10 microns.
14 . The system of claim 1 , wherein a material residence time in the growth chamber of about 30 to about 180 seconds produces CNTs having a length between about 10 microns to about 100 microns.
15 . The system of claim 1 , wherein a material residence time in the growth chamber of about 180 to about 300 seconds produces CNTs having a length between about 100 microns to about 500 microns.