Carbon fiber (CF) is a new type of fiber material with high strength and high modulus fiber with carbon content above 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite crystallites along the axial direction of the fiber and carbonizing and graphitizing. Carbon fiber is “external and soft inside”, its quality is lighter than that of metal aluminum, but its strength is higher than that of steel, and it has corrosion resistance and high modulus. It is an important material in defense military and civilian use. It not only has the inherent intrinsic properties of carbon materials, but also has the soft processability of textile fibers. It is a new generation of reinforcing fibers. [1-4] Carbon fiber has many excellent properties. Carbon fiber has high axial strength and modulus, low density, high specific performance, no creep, high temperature resistance in non-oxidizing environment, good fatigue resistance, specific heat and electrical conductivity. Between non-metal and metal, the coefficient of thermal expansion is small and anisotropic, corrosion resistance is good, and X-ray permeability is good. Good electrical and thermal conductivity, good electromagnetic shielding and so on. Compared with traditional glass fiber, Carbon fiber has more than three times the Young's modulus; compared with Kevlar fiber, the Young's modulus is about 2 times, and it is insoluble in organic solvents, acids and alkalis. Excellent corrosion resistance.

Application field

Carbon fiber is an important strategic material for the development of national defense industry and national economy. The Carbon fibermonofilament tensile curve is a key technology-intensive material. With the academic research from short fiber Carbon fiber to long fiber carbon fiber, the technology and products of using carbon fiber to make heating materials are used. It has also become popular. In the context of today's high-speed industrialization in the world, the use of carbon fiber is becoming more diversified. China has used long-fiber as a high-performance fiber. Carbon fiber composites have irreplaceable advantages when high temperature and high physical stability are required. [3] [9] [27] The higher the specific strength of the material, the smaller the self-weight of the component. The higher the specific modulus, the greater the stiffness of the component. It is because of its excellent performance that carbon fiber is used in both national defense and civil fields. There are broad application prospects. Carbon fiber carbon materials have been widely used in various fields of military and civil industries. From aerospace, aviation, automotive, electronics, machinery, chemicals, textiles and other civilian industries to sports equipment and leisure products. Carbon fiber reinforced composite materials can be used in military fields such as aircraft manufacturing, industrial fields such as wind power blades, electromagnetic shielding materials, artificial ligaments and other body substitute materials, as well as in the manufacture of rocket casings, motor boats, industrial robots, automotive leaf springs and Drive shaft, etc. Sports clubs such as bats. Carbon fiber is a new type of industrial material in the typical high-tech field.

Prospects

China's research on Carbon fiber began in the 1960s, and in the 1980s it began to study high-strength carbon fiber. Progress has been slow over the years, but it has also achieved certain results. Since the beginning of the 21st century, Anhui has taken the lead in introducing 500 tons of annual raw silk and 200 tons of annual PAN-based carbon fiber, which has brought China's carbon fiber industry into industrialization. Subsequently, some places have joined the ranks of carbon fiber production.

Since 2000, China's Carbon fiber has diversified into technology, and abandoned the original nitric acid raw silk manufacturing technology. The one-step wet spinning technology with dimethyl sulfoxide as solvent has been successful. A small number of domestic T700 carbon fiber products developed by independent technology have reached the level of international similar products. As China's demand for carbon fiber is growing, carbon fiber has been listed as a key support for the national chemical fiber industry. In 2005, the global carbon fiber market was only 900 million US dollars, and in 2013 it reached 10 billion US dollars. It is expected to reach 40 billion US dollars by 2022, and the application of carbon fiber composite materials will enter a new era. China's carbon fiber industrialization adopts a combination of independent development and introduction. By the end of the “Eleventh Five-Year Plan”, the domestically produced carbon fiber production line equivalent to Japan's T300 has basically been realized, and some enterprises have formed a 100-ton production line with a T700 or higher level.

In 2011, China's Carbon fiber market reached 6811 tons. However, due to insufficient supply, the domestic carbon fiber market is relatively slow. It is expected that in the next few years, with the increase in supply, the demand for China's carbon fiber industry will remain relatively fast. The speed is growing.

The backwardness of technology directly leads to the obvious gap between China's carbon fiber product quality and imported products, and it also greatly limits the application of domestic carbon fiber products in the high-end field. According to statistics, China's carbon fiber products are concentrated in the low-end applications, and the proportion of applications in the aerospace industry with high carbon fiber quality requirements is only 3%, far from the international carbon fiber industry's application in the aerospace industry. The average level; in the field of sports and leisure products with relatively low quality requirements, the application ratio of carbon fiber is as high as 80%, which is four times the average level of international application of carbon fiber in the field of sports and leisure products. However, the backward technology of domestic carbon fiber has restricted the healthy and steady development of China's carbon fiber industry.

China's high-performance carbon fiber is dependent on imports, and Japan's carbon fiber production accounts for 60% of the global market. On February 15, 2016, China broke through the Japanese control blockade to develop high-performance carbon fiber.

Yancheng Xiangsheng Carbon Fiber Technology Co., Ltd. is a registered trademark of “Xiangli”. It has independently developed a complete set of rotorcraft aircraft, landing gear, agricultural and forestry plant plant protection spray system, seaplane float, wind-driven ship, aviation communication helmet, plastic reinforcement. Carbon fiber, carbon fiber powder for friction materials, chopped carbon fiber for brake system, and carbon fiber rope, carbon fiber cloth, carbon fiber physiotherapy cushion, carbon fiber filament special fiber cutting machine, etc.