Preparation Of ZnO Modified Carbon Fiber/epoxy Resin Composites And Electron Irradiation Effect Research

Carbon fiber reinforced epoxy resin composites(CF/EP composites)have a wide range of applications in the aerospace,military,and civil fields because of their high specific strength and specific modulus.Carbon fiber(CF)is a graphite-like structure with a smooth surface and almost no functional groups,which is not conducive to the interface bonding between epoxy resin(EP)and CF.Based on this,this article uses ALD to deposit Zn O on the surface of CF to improve the wettability of EP to CF,and to improve the bonding strength of CF and EP matrix interface,and to improve interlayer shear properties of the Zn O modified CF/EP composites.Finally,the damage effect and mechanism of high-energy electron irradiation on Zn O modified CF/EP composites were explored.In order to modify the surface of the CF,we have used ALD technology to deposit Zn O film on the surface of CF.The thickness of the Zn O film is controlled by adjusting the process parameters of the Zn O deposition cycle.It is combined with EP to prepare Zn O modified CF/EP composites.The interlayer shear strength(ILSS)test was used to optimize the preparation process parameters of Zn O modified CF/EP composites,and the mechanism of interlayer shear performance enhancement was analyzed.The results show that when the Zn O deposition cycle is 20 cycles,ILSS of corresponding composite material shows the maximum value(76.5 MPa)and improves by 23.2% compared with unmodified CF/EP composites.XRD indicates that the deposited Zn O film has a hexagonal wurtzite crystal structure.SEM and XPS tests show that the Zn O film deposited on the CF surface is rich in active hydroxyl groups and is combined with CF through C-O-Zn bonds.The dynamic wetting angle test shows that the Zn O deposition modification improves the wettability of CF and EP substrates.The above research results indicate that the enhancement of interlayer shear properties of Zn O modified CF/EP composites is mainly due to the fact that the Zn O deposited on the CF surface is rich in polar hydroxyl groups,which can improve the wettability of the CF and EP matrix,and can form a strong chemical bond during the curing reaction of the EP matrix,and can improve the interface bonding strength of CF and EP.and can enhance the interlayer shear performance of the Zn O modified CF/EP composites.Because of these,the interlayer shear properties of Zn O modified CF/EP composites are enhanced.The high-frequency and high-pressure electron accelerator device was used to simulate the space high-energy electron irradiation test to study the damage effect of highenergy electron irradiation with different irradiation fluences on the Zn O modified CF/EP composites.The macro and micro morphology,mass loss rate and changes of surface chemical groups of the composite was been tested and analyzed after irradiation.The damage mechanism of Zn O modified CF/EP composites was analyzed by CASINO simulation software.The research results show that with the increase of irradiation fluence,the color of Zn O modified CF/EP composites gradually becomes black,and the mass loss rate gradually increases.With the increase of irradiation fluence,ILSS shows a trend of first increasing and then decreasing.SEM,FTIR and the simulation results of CASINO software show that the cross-linking and degradation of the EP matrix in the Zn O modified CF/EP composites under the action of high-energy electron irradiation are the main factors that cause the interlayer shear properties of the composites to change.