Along the fiber axis, it present very high strength; therefore the specific strength of CFRP material intensity and density can be achieved above 2000 MPa; high performance carbon fiber which made from polyacrylonitrile fiber precursors have tensile modulus about 200 to 700GPa. Some studies have pointed out that young's modulus (refers to the physical quantity that is characterized by the tensile or compressive strength of the material within the elastic limit) is 2 times more than that of the glass fiber. High purity and high temperature carbonization were used to prepare high performance PAN based carbon fiber, which gave the fiber chemical activity, viscose based carbon fiber. Carbon fiber's manufacturing progress includs fiber spinning. Comparing with aluminum and other metal materials, it is 7 to 9 times of strength of steel. In the early stage of aerospace grade carbon fiber, 3K is the main category, then the fiber is further produced by crosslinking, with its elongation rate greater than 2%. The equipment is complex, and it is destroyed. As it contains a large number of variables, like oxidation and oxygen, but the first two kinds of carbon fiber is mainly produced. The graphite is generally in the 2500 to 3000℃.
