High strength light data of "soft and internal stiffness"
In 1861, Edison used carbon as filament data, and successfully lit for 45 hours, bringing human beings into the electric light age.
With the replacement of tungsten wire in the bulb, carbon wire was lost into the corner of previous history for nearly a century.
Until the 1950s, when the air force was searching for the data of the resistance to burning and melting, it found that the carbon melting point was as high as 3727 ℃ and had the characteristics of high temperature resistance and high strength. Then the carbon fiber was introduced to the laboratory again and the carbon fiber was invented.
Carbon fiber is a new type of fiber with carbon content of more than 95% high strength and high modulus. It is a kind of microcrystalline graphite material composed of organic fibers such as flake graphite microcrystalline, which are piled along the fiber axis, and are carbonized and graphitized.
Carbon fiber is "flexible and internal rigid", which is smaller than aluminum, but higher in strength than steel, and insoluble and non swelling in organic solvents, acids and bases, and has excellent corrosion resistance. It has the inherent nature of carbon data, and it also has the soft processability of textile fiber, and is a new generation of reinforced fiber.
The carbon fiber is fatigue resistant, with a specific heat and conductivity between non-metallic and metal, with small thermal expansion coefficient, excellent conductive and heat conduction performance and good electromagnetic shielding.
The resin, curing agent and other materials are mixed in a certain proportion, then moisten the carbon fiber fabric, and then form the carbon fiber composite data after a series of curing treatment. This kind of data has the advantages that traditional metal data do not have.
The thickened carbon fiber cloth is very flexible, almost as rigid as the data. It works as if the paper was posted into a thick stack of paper, and the pile would become consolidated. This is the process of carbon fiber mutation from paper soft to steel.
Two main soft ribs of carbon fiber: high cost and difficult to recover
"The promotion and application of carbon fiber is not a big technical problem, and it is still a price problem. In addition, the recovery of carbon fiber after many uses is a big problem. " Chen hopes that people in the industry will consider carbon fiber systematically.
The composite materials of the bond of carbon fiber and epoxy resin. The composite data inherits a series of advantages such as specific strength, specific modulus, fatigue resistance and energy absorption and seismic resistance of carbon fiber, and also inherits the flexible and diverse formulation planning of epoxy resin. Compared with aluminum alloy structure, the weight reduction effect of carbon fiber composite can reach 20% to 40%. Compared with steel metal, the weight reduction effect of carbon fiber composite materials can reach 60% to 80%.
The application of carbon fiber composite data can reduce the vehicle weight and have a profound impact on the production process of the car.
With the increase of carbon fiber composite data in the car, the four processes of car production, stamping, welding, coating and assembly will change. For example, stamping will be replaced by molding and casting technology; the assembly of the whole vehicle will no longer require so much welding; some cars and even basically no longer need painting; the whole vehicle will become dozens of modules, and the assembly rhythm will become very fast. As a result, the total assembly line investment cost will drop. Therefore, the large-scale application of new carbon fiber composite materials will reduce the entry threshold of the car manufacturing industry.
Carbon fiber is combined with a plastic polymer resin and becomes a solid and simple compound material that industry likes. However, in the process of production, each piece of compound data is manually split by workers, which is very wasted.
If someone can separate carbon fiber from the landfill, they can recover the carbon fiber. The process of carbon fiber production consumes a lot of energy. Using the recoverable carbon fiber can save a lot of energy.
The key is that carbon fibers are not as easy to melt and reshape as aluminum. Carbon fiber compounds are placed with long and accurate carbon fibers to obtain strength, and then formed by polymer bonding at high temperature and high pressure. Once formed, most solid polymers will not be able to melt, burn or chemically dissolve to obtain valuable fibers.
In the world, some enterprises have recovered carbon fiber by burning polymer, and some enterprises take back carbon fiber by chemical treatment. In either way, the carbon fiber recovered is much less bearing than the new carbon fiber. Therefore, carbon fiber is often used in the production of heavy, light and light strength products such as tennis rackets and golf clubs. It is still a good material, but it is not better than aluminum and low cost compounds.
