Carbon carbon composite material is made of reinforcing carbon fiber and carbon matrix,the C/C composite material need presoma decompose into matrix carbon,the property of the carbon decide that it can not be made by the inorganic material and metal matrix composite material.
The preparation method mainly divided into three steps: prefabricate the carbon fiber embryo then increase the carbon content and density of the matrix and the last one is high temperature heating(graphitization).
1、According to the different requirement and different production,the way to make the carbon fiber embryo mainly have:
1) Short fiber molding,
2) Long fiber weaving and lamination,
3) Multidimensional weaving or puncturing.
4) Novoltex 3D fine woven fabric.
2、There are three methods to increase the carbon content and density of the matrix:
1) Liquid phase method
thermosetting resin or thermoplasticity pitch impregnation and carbonization method.
2) Chemical vapor phase method
Mainly refers to Chemical Vapor Infiltration(CVI)
3) Combination of the two methods.
3、high temperature treatment
The temperature of carbon carbon composite material usually range from 2400℃~3000℃,the purpose is to promote the formation of graphite structure,so it also called the graphitization.after the graphitization,the thermal conductivity of carbon carbon composite material can increase from 10W/(m.k) to 120W/(m.k),but at the same time ,the mechanical property will reduce about 10%.
