Experimental Study On Basic Mechanical Properties Of Domestic Carbon Fiber Renforced Plastic

As one of the most important advanced materials in aerospace, Carbon Fiber Reinforced Plastic (CFRP) is attracting more and more attention nowadays. Carbon fiber reinforced composite has a wide development space, not only in the military field, but also in civilian field. Thus the number of countries who is paying their attention to this area is rocketing rapidly. In order to get rid of the blockade of foreign monopoly manufacturer of carbon fiber,we have paid long-term continuous efforts. Now we have a number of carbon fiber manufacturers in our country, whose product performance is almost equivalent to T300 carbon fiber of Toray in Japan. In order to understand the performance of domestic carbon fiber and accelerate the localization process of carbon fiber, in which way the local carbon fiber can be widely used in high-tech fields, in this paper two kinds of carbon fiber was researched both in their surface properties and the mechanical properties of their composites.The data of SEM and LCSM and AFM indicated that the domestic carbon fiber CCF300 is a little lower than T300 in surface roughness, and almost equivalent to T300 carbon fiber in wetting property. Meanwhile CCF300 is better than T300 in cross section shape, so that the domestic carbon fiber CCF300 can form good bonding with the resin matrix just as that of T300. However, the ST300 carbon fiber is not as good as the other two carbon fibers either in surface roughness or wetting property. Thus it will have weaker interface bonding strength in the composite.After continuous attempts,carbon fiber composite fabrication process was optimized to solve the broken of fiber yarn in the process of winding to achieve a stable winding progress. Mechanical properties of CFRP data shows that tensile and bending strength of CCF300/EP composite were 1915.5MPa and 1418.7MP, both of which are higher than that of T300/EP. But shearing performance was slightly lower than that of T300CF/EP. For that of ST300, there is still a gap between it and T300/EP, due to the mechanical properties and surface properties of ST300A carbon fiber. Data of high-temperature aging test indicated that the shearing strength were sensitive to the aging time. But the conservation rate of bending strength is high enough after aging test. For the domestic carbon fibers, there is still a long way to go before the large scale application. We need to increase not only the carbon fiber performance but also need to optimize the composite producing process and technology, in order to improve the interface performance to make the carbon fibers play much better in reinforcement composite.