Studies On Microstructure And Properties Of Continuous Unidirectional Carbon Fiber Reinforced Aluminum Laminate Matrix Composites Prepared By Vacuum Heat-Pressing Process

Continuous carbon fiber reinforced aluminum matrix composites has received much attention in the aerospace industry.It can give full play to the high strength of carbon fiber reinforcement and high toughness of aluminum matrix.It has the advantages of high strength,stiffness,heat resistance,good structure stability and design feasibility.It also can achieve both weight-loss and intensity improvement.In this paper,for the fiber damage of carbon fiber reinforced aluminum matrix composites was prepared by liquid forming process,the 1060 aluminum foil with the thickness of the 0.2 mm and the HL403 aluminum powder were selected for the matrix materials,the M40 carbon fiber was chosen as the reinforcement material.Continuous unidirectional carbon fiber reinforced aluminum matrix composites were prepared by vacuum heat pressing process method.The volume fraction of M40 carbon fiber is 22.80%.In this paper,effects of heat-pressure temperature,heat-pressure time and heat pressure on microstructure,interface reaction,tensile strength were studied.The main conclusions are as follows.(1)The characteristic diffraction peaks of brittle phase Al4C3 were not found in the continuous unidirectional carbon fiber reinforced aluminum matrix composites prepared by vacuum heat pressing process in the range of 510? to 550?.Comparing with the liquid forming method,the vacuum heat pressing process can obviously reduce the interface reaction of the carbon and aluminum at the appropriate technological parameters.(2)Prolonging the heat-pressing time is beneficial to the diffusion of aluminum between the fiber bundle and the fiber.But,when the temperature increases to 550?,the HL403 aluminum alloy melts and is easily extruded out of precast material.That result in inhomogeneous microstructure of the composite.When the heat pressure temperature is 510?,the heat pressure time is 180 min,and the heat pressure is 15 MPa,the distribution of the fiber in the composite material is even.(3)The effect of heat pressure time on composites strength is highly significant.The effect of heat pressure temperature on composites strength is significant.The effect of heat pressure on composites strength is significant.When the heat pressure temperature is 510?,the heat pressure time is 180 min,and the heat pressure is 15 MPa,the continuous unidirectional carbon fiber reinforced aluminum matrix composites prepared by vacuum heat pressing process,the density of composites is 2.492g/cm3,the tensile strength is 254.75 MPa,the elastic modulus is 169.42 GPa,and the bending strength is 334.97 MPa,and the compactness is 99.80%.(4)When the heat pressure temperature is 510?,the heat pressure time is 180 min,and the heat pressure is 15 MPa,the technological parameters of preparation of composite materials is reasonable.Composites formed a little interfacial bonding strength.Interface can change the direction of the crack when that matrix composites prepared by vacuum heat pressing process is stretched.Therefore,carbon-aluminum binding can protect the carbon fiber reinforcement material.