The main factors of the influence of the carbon carbon composite material include the type of carbon fiber, volume fraction and the type to reinforce,the type and structure of the matrix carbon,material density and the heating temperature(graphitization) etc.the mechanical property of the carbon carbon composite material will increase with the increasing of the density,but the heating will reduce the strength of the C/C composite material.
As to the densification process of embryo body is different,so the mechanical property of carbon composite material is usually different,different scolars will get different results.In general, we think that CVI carbon and the carbon fiber can form a good combination,so the CVI can make the carbon carbon composite with a better mechanical property than the liquid phase impregnation.
Actually ,no matter CVI or liquid phase impregnation to treat the carbon carbon composite material,the structure of the matrix carbon has a great influence on the mechanical property,so to the C/C composite material used aviation brake,the design of matrix carbon is very important to the mechanical property.And the processing of the matrix carbon also need to consider the cost of the raw material and other properties,like heating conductivity and the friction property.
The volume fraction of the the carbon fiber is also a very important parameter.if the content of the carbon fiber too short,the function of the carbon fiber is hardly to show up.the mechanical property of the C/C composite material will increase with the increasing of the carbon fiber content,when it reach to a certain limit,the property will reduce will the increasing of the carbon fiber.
To the carbon composite material with CVI processing,another influence is the structure of the CVI carbon.but the research on this part is short,especially for the 2D and 3D C/C composite material.the influence of the CVI carbon to the carbon carbon composite material need the further research.
