Carbon fiber is a kind of new material with excellent mechanical properties, which is characterized by strong tensile strength and flexible machinability. The tensile strength of carbon fiber is about 2 to 7GPa and the tensile modulus is about 200 to 700GPa. Density of about 1.5 to 2.0 grams per cubic centimeter, which, in addition to the structure of the original silk, mainly depends on the temperature of carbonization treatment. Generally after high-temperature 3,000 ℃ graphite treatment, density of up to 2.0 grams per cubic.
Plus its weight is light, its proportion is lighter than aluminum, less than 1/4 of steel, compared to the strength of iron 20 times times. The coefficient of thermal expansion of carbon fiber is different from other fibers, and it has anisotropic characteristics. The specific heat capacity of carbon fiber is generally 7.12.
The thermal conductivity decreases as the temperature rises parallel to the fiber direction (0.72 to 0.90), while the fiber orientation is positive (32 to 22). The specific resistance of carbon fiber is related to the type of fiber, at 25 ℃, the high modulus is 775, and the High-strength carbon fiber is 1500 per centimeter. This allows the carbon fiber to have the highest specific strength and modulus in all high-performance fibers.
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