Carbon fiber (CF) is a new type of fiber material with high strength and high modulus fiber with carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystallines along the axial direction of the fiber, and obtained by carbonization and graphitization treatment. Carbon fiber is "soft on the outside and rigid on the inside", the quality is lighter than that of metal aluminum, but the strength is higher than that of steel, and it has the characteristics of corrosion resistance and high modulus, which is an important material in the national defense industry and civil use. It not only has the inherent intrinsic characteristics of carbon materials, but also has the soft processability of textile fibers, and is a new generation of reinforcing fibers. [1-4]

Carbon fiber has many excellent properties, carbon fiber has high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity between non-metal and metal, small thermal expansion coefficient and anisotropy, good corrosion resistance, good X-ray permeability. Good electrical and thermal conductivity, good electromagnetic shielding, etc.

Compared with traditional glass fiber, Young's modulus is more than 3 times; Compared with Kevlar fiber, Young's modulus is about 2 times its modulus, and it is not soluble or swollen in organic solvents, acids and alkalis, and its corrosion resistance is outstanding.