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Characteristics,  application  and  development  of carbon fiber

 
1.Characteristics and properties of carbon fiber

  Carbon fiber materials are black, hard, high strength, light weight and other new materials with excellent mechanical properties. Its specific gravity is less than 1/4 of steel. The tensile strength of carbon fiber resin composite materials is usually above 35000MPa, 7.9 times that of steel. The tensile modulus of elasticity is between 230000MPa and 430000MPa. Therefore, the specific strength of CFRP, that is, the ratio of the strength of the material to its density, is above 20000MPa/(g/cm3), but the specific strength of A3 steel is 590MPa/(g/cm3) The specific elastic modulus is also higher than that of steel. The higher the specific strength of the material, the smaller the self-weight of the part, the higher the specific elastic modulus, the greater the rigidity of the part. In this sense, the broad application prospect of carbon fiber in engineering is illustrated. Looking at the excellent properties of many emerging composite materials, such as Polymer composite glass fiber material, metal-based composite materials, and ceramic-based composite materials, many experts predict that composite materials will enter the era of widespread material application from the age of steel.

  PAN carbon fiber and fibreglass composite materials:
  (1) Mechanical properties, lower density than metal, light weight; high modulus, high rigidity, high strength, high fatigue strength, excellent wear resistance and lubricity; excellent vibration attenuation;
  (2) Small heat resistance, stability, thermal expansion coefficient, good dimensional stability, thermal conductivity; excellent heat resistance in inert gas;
  (3) It belongs to a variety of conductive materials having electrical conductivity and electromagnetic wave shielding properties, and electrical conductivity and electromagnetic wave shielding properties.
  (4) It is excellent in X-ray transmittance, and an appropriate structure can be designed according to the purpose.

  In 2007, Japan's main Carbon fiber supplier Toray Co., Ltd. cooperated with Nissan Motor and other companies to develop cutting-edge materials using carbon fiber, which can greatly reduce the weight of the main parts of the car, such as the chassis. The new technology reduces the overall weight of the car by 10% and improves fuel consumption by 4% to 5%. In addition, the impact resistance is 1.5 times that of the conventional one. The manufacturers plan to bring the new technology to commercial vehicles in three years' time. The new technology promises to speed up the switchover of steel-centric automotive raw materials against the backdrop of tougher fuel bill regulations to reduce greenhouse gases around the world