carbon fiber tube
carbon fiber tube
(OP)
Hello,
I have been looking for an off the shelf carbon fiber tube and can not seem to find one in a size that would work for me. Does anyone know of a COTS supplier for a thin walled tube in the 3 to 6 inch diameter range that is 30 inches or longer?
Thanks in advance for all the help.
I have been looking for an off the shelf carbon fiber tube and can not seem to find one in a size that would work for me. Does anyone know of a COTS supplier for a thin walled tube in the 3 to 6 inch diameter range that is 30 inches or longer?
Thanks in advance for all the help.





RE: carbon fiber tube
Having someone make one tube for you is never cheap.
Or you can make your own which is not easy if you don't have experience already.
If you want to find a possible supplier you need to tell us what you want the tube for and the important specs. and someone may suggest a company that makes something close.
RE: carbon fiber tube
RE: carbon fiber tube
RE: carbon fiber tube
They the following in stock:
Part# 45285 3.0-70-FABR ID(in.) - 3 OD(in.) - 3.125
Wall(in.) - 0.062
Weight(lbs./ft) - 0.4
Length(in.) - 70 stock rw deco cello-wrap
Price 1-10 - $290.19
11-49 - $267.29
50+ - $240.96
RE: carbon fiber tube
It will be supporting a high voltage RF experiment. So we want to try and have a volatage gradient as it moves away from the test device. The hope is that the carbon fiber tube with have enough resistance through the length of the tube to smoth it out a little.
litebike,
that might work I will try to contact them today.
Thanks everyone
RE: carbon fiber tube
RE: carbon fiber tube
Don't you want an insulator with a slight amount of conductivity instead of a metal with a slight amount of loss?
You don't use carbon fiber as a radome, rf won't pass thru it. Aircraft radomes are often simple plastic and coated with a resistive paint that dissipates static.
What levels of voltage are you planning on?
kch
RE: carbon fiber tube
I was not aware that carbon fiber would block rf.
For my current application if rf will not pass thru that is ok. We are looking at a 30kV max for this test.
RE: carbon fiber tube
I have never seen a plastic radome for any commercial or military aircraft i have worked on.
Its all a black art when it comes to military transmission stuff, and specific distances, thicknesses, coatings and angles are important, as is the ability to pass through the "dome", but plastic is something i've neve seen used.
RE: carbon fiber tube
I've done alot of radome design and one of the most common types is to pick a material that's physically tough and use a sheet of it that's 1/4 wavelength electrically thick. The reflection from the front face cancels the reflection from the back face and the thru loss is minimal. Two wrongs make a right in rf.
Usually this is done at X band, wavelength is one inch, quarter wavelength is 1/4 inch, material dielectric of 4 is typical, hence the 1/4 wave electrical length ends up 1/8 inch thick. Many radomes can be simple, especially if you only need to transmit through them straight on and don't need to go far out in angle. The most difficult is far out in angle and circular polarization and very wide bandwidth.
mechpins, I'd suggest some type of FR4/G10 tube.
Why do you need to have a resistance on the standoff?
If you're just trying to insulate your product, visit the power company and borrow an insulator used on the power poles.
kch
RE: carbon fiber tube
Even one filament of carbon fiber contamination in a radome can destroy it. The fiber will vaporize and char the resin which then will fry in microwaves.
RE: carbon fiber tube
Thanks for all the help guys!