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What is carbon fiber?

Carbon fiber is a high-strength, high modulus fiber with a carbon content exceeding 90%. It can be made from raw materials such as polyacrylonitrile, viscose fiber, asphalt fiber, etc., and is oxidized and carbonized at high temperature. It can be mixed with matrices such as metals, ceramics, and resins to make carbon fiber composite materials, with a wide range of applications. The specific gravity of carbon fiber is generally 1.70 g/cm3 to 1.80 g/cm3, with a strength of 1200 MPa to 7000 MPa, an elastic modulus of 200 GPa to 400 GPa, and a thermal expansion coefficient close to zero, even negative values (~1.5 × 10 to the 6th power).

What are the advantages of carbon fiber materials?

1. Carbon fiber materials have low specific gravity, high specific strength and specific modulus;

2. Under non oxidizing environments, it is resistant to ultra-high temperatures, has good fatigue resistance, and has a specific heat and conductivity between non-metals and metals;

3. There is no creep due to changes in temperature difference or long-term operation, with a small tensile coefficient (1.6%), a small thermal expansion coefficient, and anisotropy;

4. Good X-ray transmission, good conductivity and thermal conductivity, and good electromagnetic shielding.

5. Strong designability, the mechanical properties of carbon fiber products can be changed by changing the angle or number of layers;

6. Compared to glass fiber, carbon fiber has a Young's modulus more than three times that; Compared with Kevlar fibers, its Young's modulus is about twice that of Kevlar fibers;

7. Good corrosion resistance, insoluble in organic solvents, acids, and alkalis, outstanding corrosion resistance.

What are the drawbacks of carbon fiber materials?

1. Carbon fiber products belong to customized products with high directionality, and due to the high raw materials and production costs of carbon fiber, it is relatively difficult to achieve mass production of carbon fiber products, and there is no price advantage;

2. Although carbon fiber composite materials have high tensile strength, their shear strength is weak, requiring complex stress calculations during processing;

3. Carbon fiber is a brittle material that will not deform under excessive force, but will directly fracture, so carbon fiber products cannot be repaired after damage and can only be replaced;

4. Currently, thermosetting carbon fiber composite materials are widely used, which are difficult to recycle and have poor reuse rates.