by trueno » Sat Jul 17, 2004 3:39 am
What do you want to build?
With carbon, you are looking for strength with minimum weight, so the methods are important. There is an ideal ratio of resin to carbon, and it's not alot of resin.
My dad works with carbon (boats) and he bakes it under vaccum, It's pretty simple to do but you need a decent vaccum pump, a vaccum cleaner wont cut it, it doesnt have to shift alot of air but it has to drop the pressure significantly. This draws the resin out of the carbon and compacts everything, it also removes air bubbles to a certain extent. the resin he's been using recently was baked at ~50'C
It's not hard to do but for good results (ie strong and light) you need to do it properly. If you just want it to look like carbon then it doesnt matter, but carbon is horribly expensive, you could build a fibreglass piece and cover it with layer of carbon.
For things like F1 they use basically the same process, except they stick everything inside a pressure vessel to apply more pressure (~5 bar I think) this basically just draws more resin out so that it weighs less. because of the finer tolerances and extreme pressures, the moulds that they use are also of a much higher quality, it's expensive stuff.