As an important reinforcement of composite materials, high-modulus carbon fiber is widely used in high-tech fields such as aerospace due to its excellent mechanical properties.
High modulus carbon fiber
High-modulus carbon fiber refers to high-performance carbon fiber with a modulus of elasticity exceeding 350 GPa. For a long time, foreign high-modulus carbon fiber has been in a leading position. In recent years, China has made considerable progress in the field of high-modulus carbon fiber preparation technology, and the gap with the world's top level is constantly decreasing.
Demand for high modulus carbon fiber
The design of the spacecraft structure is mainly based on rigidity. Under the condition of satisfying the conditions of carrying load and space environment, the design of the spacecraft structure mainly aims to improve the rigidity of the main structure, the rigidity of the solar wing frame, and the rigidity of the antenna truss. Therefore, in consideration of satisfying the molding process, fiber-matrix interface performance, etc., PAN-based carbon fiber uses high modulus grades as the main selection basis in the satellite manufacturing field to achieve structural weight reduction. Therefore, PAN-based high-modulus carbon fiber with a characteristic modulus of more than 500 GPa will still be the main development direction of high-performance carbon fiber products for satellite manufacturing in the future.
Application of high modulus carbon fiber
PAN-based high modulus carbon fiber composite material has excellent characteristics such as high specific stiffness, good dimensional stability, strong ablation resistance and overall design. It is indispensable in the main structure, functional structure, protective structure and auxiliary structure of existing and future satellites. Alternative key materials.
At present, carbon fiber materials have been widely used in various satellite structure products at home and abroad. It has been successfully applied to several typical satellite structure products at home and abroad, such as main bearing structures such as load-bearing cylinders and structural plates, dimensional stability structures such as optical platforms, high-precision trusses, and ground observation camera lens barrels and antenna reflection surfaces Wait for the satellite payload structure.
Development status of China, Japan and the United States
At present, the highest modulus of PAN-based high modulus carbon fiber products that have been commercialized abroad is 588 GPa of Toray M60J fiber from Japan. Although Japan’s Toray Company has broken through the M65J grade carbon fiber preparation technology, it is also a small test product and has not really formed a large-scale production. Therefore, the key parameters of the product are not clear; in addition, Japan`s Teijin UM68 fiber drawing die The amount of 650GPa (intensity 3.33GPa) is also a small test product, and has not been commercialized.
In the field of the latest foreign technological progress, with China`s technological breakthroughs in the field of high-performance carbon fiber in recent years, foreign carbon fiber companies such as Japan`s Toray and American Hexcel have continued to strengthen key technology research and development, and have successively achieved M40X (tensile strength of 5700 MPa, tensile strength) Tensile modulus 377 GPa, technological breakthrough in November 2018, not yet commercialized), HexTow HM50 (tensile strength 5723 MPa, tensile modulus 345 GPa, commercialized in 2019), HexTow HM54 (tensile strength 4826 MPa, tensile strength The key technology of PAN-based high modulus carbon fiber such as 372 GPa, commercialized in 2020).
PAN-based high-strength and high-modulus carbon fiber developed by ZKNB
ZKNB Carbon Fiber Technology Corporation has carried out the research and development of key technologies for the localization of PAN-based high modulus carbon fibers since 2010. In January 2014 and March 2016, it took the lead in achieving breakthroughs in key technologies for M55J and M60J high modulus carbon fibers in China;
In June 2018, the M65J grade high-strength high-modulus carbon fiber with a tensile modulus of 630 GPa or more was successfully developed, marking that in the field of high-strength and high-modulus carbon fiber preparation technology, China has achieved parallel running by long-term follow-up, and ZKNB domestic high-strength high-modulus carbon fiber takes the lead The preparation technology will further promote the innovation and development of other Chinese carbon fiber material companies in this field.