Carbon fiber is one kind of special fiber consists of carbon element.it has high temperature resistant,good wear resistance,electrical conductivity,thermal conductivity,corrosion resistance etc.It’s fiber in shape,flexible,and could be machined into fabric.
Along the fiber axis direction,it has a high strength and modulus.density of the carbon fiber is low,so it has a high specific strength and specific modulus.
The most important use of carbon fiber is to be the reinforce which be manufactured as advanced composite materials with resin,metal,ceramic and carbon etc.
The carbonization processing of the precursor fiber,the raw material,carbon content below:
precursor fiber
|
Item |
Chemical composition |
Carbon content/% |
Percent recovery of carbon fiber/% |
|
PAN |
(C6H10O5)n |
45 |
21~35 |
|
RAYON |
(C3H3N)n |
68 |
40~55 |
|
PITCH |
C,H |
95 |
80~90 |
The procedure of the 3 process above includes:
- stabilizing treatment(200~400℃)
- carbonization treatment(400~1400℃)
- graphitization treatment(>1800℃)
In order to improve the bonding performance between carbon fiber and composite material,the surface treatment,sizing and drying are usually used. Another way to manufacture the carbon fiber is The vapor phase growth method. Under 1000℃,the mixed gas of methane and hydrogen with catalyzer could meet discontinuous and chopped carbon fiber,the max length is about 50cm. The structure of chopped carbon fiber is different from PAN or PITCH ones,it has an easy graphitization,good conductivity property etc.
