Research On RTM Process And Temperature Resistance Of Carbon Fiber Composites

With its unique advantages of a lightweight,high strength,corrosion resistance,and flexible structural design,carbon fiber composite materials have become a new generation of advanced composite materials,which are widely used in various fields of the national economy and have excellent prospects for future market applications.In the face of the service requirements of lightweight,high-performance,and temperature-resistant components in the fields of aerospace,delivery vehicles,petrochemicals,etc.,such as aircraft engine low-temperature end of the compressor blades and magazines,vehicle engines and components,temperature-resistant oil pipelines,etc.,the low-cost and high-performance manufacturing of carbon fiber resinbased composites at 100°C-200°C has become a key technology.In this paper,we use liquid resin molding transfer(RTM)technology,24K-T300 fiber cloth,692-9G temperature-resistant epoxy resin system as raw materials through resin modification,RTM process optimization for interface control,SEM,DSC,DMA,and other advanced analysis and testing means,to prepare the present evidence of excellent mechanical properties.Good temperature resistance of composite samples,to study its "The main conclusions are as follows.The two curves of 401/692-9G and silicone/692-9G modified exothermic peaks increased significantly,and two exothermic peaks appeared,indicating the curing reaction of the 692-9G resin system was favored.No peak appeared after the second temperature rise indicating complete curing.The enhanced vibrational peaks of silicone covalent bonds proved that the silicone chain segments were successfully grafted on the molecular chain of epoxy resin.The orthogonal test results with injection pressure,injection speed,and injection pressure as factors showed that the optimal process parameters were 2.5 MPa,40 ml/min injection speed,and 80 ℃.After adding titanate coupling agent,the adhesion of the epoxy resin system was improved,so that the tensile properties of the material increased by about 16.38 %,and the impact toughness increased by about 15.68 %.The addition of silicone and epoxy resin system copolymerization can form a chemical composition uniform crosslinking network,making the bending properties of the material increased;the impact toughness of the material is increased by 41.17 % due to the deformation ability of the silicone to disperse the stress.Under the high-temperature aging condition of 200℃,the mechanical properties of the resin matrix decreased due to oxidative decomposition and fiber/resin interface damage after thermal-oxidative aging;after the addition of titanate coupling agent,the boiling point was similar to the aging temperature,which led to a faster decrease in performance,but the performance of the material gradually stabilized in the late aging period;after the addition of silicone,the retention rate of mechanical properties was about90%,compared to the unmodified,the retention rate of mechanical properties is about90%,which is a particular improvement compared with the unmodified ones,indicating that the addition of silicone can improve the temperature resistance of the material.The dynamic mechanical properties experiments verified that adding silicone chain segments would reduce the energy storage modulus of the material,and the higher degree of property retention after the thermal-oxidative aging experiments was a clear sign of the improvement of the temperature resistance of the specimens.