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2005-01-19 08:00:00

How to make carbon fiber?

Carbon fiber is a fibrous carbon material. It is a new type of material with greater strength than steel

Carbon fiber is a fibrous carbon material. It is a new type of material with greater strength than steel, lower density than aluminum, corrosion-resistant than stainless steel, high temperature resistant than heat-resistant steel, and conductive like copper, and it has many valuable electrical, thermal and mechanical properties. . The aircraft made of composite materials made of carbon fiber and plastic is not only lightweight, but also consumes less power, has a large thrust and low noise, and the use of carbon fiber electronic computer disks can improve the computer's storage capacity and computing speed; it uses carbon fiber reinforced plastics. The manufacture of space vehicles such as satellites and rockets has high mechanical strength and low mass, which can save a lot of fuel.

At present, people cannot directly use carbon or graphite to draw carbon fiber. Only organic carbon-containing fibers (such as nylon, acrylic, rayon, etc.) can be used as raw materials. Organic fibers are combined with plastic resins and put together. In a rare gas atmosphere, the carbon fiber is a fibrous carbon material that is strongly carbonized at a certain pressure, and its chemical composition contains more than 90% of carbon. Since carbon alone cannot be melted at a high temperature (sublimation at 3,800 K) and does not dissolve in various solvents, it has not been possible to produce carbon fibers from carbon alone.�

Carbon fibers can be obtained by solid-phase carbonization of high-molecular organic fibers or gas-phase pyrolysis of low-molecular hydrocarbons. Most of the carbon fibers sold in the world before were produced by solid-phase carbonization of polyacrylonitrile fibers. The resulting step is A pre-oxidation: heating in air, maintained at 200-300 degrees for tens to hundreds of minutes

The purpose of pre-oxidation is to convert the linear molecular chains of polyacrylonitrile into a heat-resistant ladder structure so that they do not melt and incombustibly maintain the fiber state during high-temperature carbonization. B Carbonization: heating to 1200-1600C in an inert atmosphere and maintaining a few minutes to several tens of minutes to produce product carbon fiber; the inert gas used may be high-purity nitrogen, argon or helium, but high purity is generally used. Nitrogen. C graphitization: It is heated to 2000-3000 degrees in an inert atmosphere (generally high purity argon gas) and maintained for several seconds to several tens of seconds; the carbon fiber thus produced is also called graphite fiber.�

Carbon fiber has excellent fineness (one of the representation of fineness is gram of 9000 meters long fiber), generally only about 19 grams; tensile force up to 300KG/MM2; also high temperature, corrosion resistance, electrical conductivity, heat transfer, Peng expansion coefficient and a series of excellent performance. There are almost no other materials with so many excellent properties like carbon fibers


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