China once again achieved breakthroughs in core technologies and developed new carbon fiber

In the history of world aviation development, materials are constantly moving forward with the mutual promotion of aircraft, just as the material structure of large-scale aircraft in Europe and America is currently transitioning from aluminum alloy to composite material. It can be said that the starting point of the future aircraft is to use 50% composite materials. At present, after more than 30 years of research and application, composite materials are mature in technology.

I believe everyone knows that carbon fiber is known as “black gold” because of its difficult manufacturing technology and high practical value. It is a kind of fibrous carbon material, which is a new type of material with stronger strength than steel, lower density than aluminum, corrosion resistance than stainless steel, and high temperature resistance of heat resistant steel.

In order to improve the aircraft’s advanced nature and environmental protection, carbon fiber composite materials have become the main means of aircraft lightweighting. At the previous Zhuhai Air Show, the proportion of composite materials used in the latest generation of large aircraft CR929 jointly developed by China and Russia is expected to exceed 50%. In addition, the composite material used in China’s domestic large aircraft C919 accounts for 12% of the structural weight of the aircraft, and the composite material here is mainly carbon fiber.

According to the Shanxi Institute of Coal Chemistry of the Chinese Academy of Sciences, the Zhang Shouchun team recently completed the acceptance of the T-1000 ultra-high-strength carbon fiber, and the polyacrylonitrile-based ultra-high-strength carbon fiber prepared by the key deployment projects passed the acceptance test and successfully developed the polyacrylonitrile base. New hollow carbon fiber.

In the aerospace, civil industry, and defense fields, polyacrylonitrile-based carbon fiber is an indispensable key material. As a major field in the carbon fiber industry, polyacrylonitrile-based carbon fiber has become the mainstream of carbon fiber development due to its best mechanical properties and the widest application field. It also accounts for 90% of the total market size of carbon fiber.

The production technology of polyacrylonitrile carbon fiber mainly includes wet spinning and dry jet wet spinning. Among them, dry jet wet spinning has the advantages of high production efficiency, high quality and low cost, and is the main production mode of high-end brand carbon fiber in the world. China’s Zhang Shouchun team is taking the dry-jet wet spinning route. The core technology breakthrough is dry-jet wet spinning. The performance indexes of the T-1000 ultra-high carbon fiber prepared by the company have reached the advanced level in the industry.

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