C-C composite or carbon-carbon composite material is a kind of carbon matrix composite reinforced by carbon fiber and its fabric. It has the advantages of low density (< 2.0g / cm3), high strength, high specific modulus, high thermal conductivity, low coefficient of expansion, good friction performance, good thermal shock resistance, high dimensional stability, etc. it is one of the few alternative materials applied at 1650 ℃ and above, with high theoretical temperature as high as 2600 ℃. Therefore, it is considered to be one of the promising high-temperature materials.
Due to its unique properties, carbon / carbon composite materials have been widely used in aerospace, automotive industry, science and other fields, such as rocket motor nozzle and its throat lining, the thermal protection system of the end cap and wing leading edge of the space shuttle, aircraft brake disc, etc.