ABSTRACT

Continuous carbon fiber reinforced thermoplastic resin composites (CFRTPCs) are widely used in various fields due to their advantages of light weight and high strength. In the 3D printing process of composite materials, carbon fiber is used as reinforcement, and the interface bonding performance between carbon fiber and resin is a key factor affecting the mechanical properties of materials. In order to improve the mechanical properties of 3D printed continuous carbon fiber reinforced polycarbonate (PC) composites, the continuous carbon fiber was pretreated with different concentrations of water-based PC sizing agent, and studied the influence rule of sizing agent concentration change on sizing quantity of continuous carbon fiber. By using polycarbonate as the matrix, print the composite structural parts with continuous carbon fiber and different sizing amount of carbon fiber prepreg filament as the reinforcements respectively. Then, the surface morphology of continuous carbon fiber before and after sizing was observed and compared, and the effect of sizing treatment on the mechanical properties of the composite was analyzed. The results showed that with the increase of sizing agent concentration, the sizing amount of continuous carbon fiber increased, but the increase gradually slowed down, and the surface roughness of continuous carbon fiber after sizing increased, and the internal single filament interface was improved. The mechanical properties of prepreg filament composites with different sizing amount are improved compared with those of carbon fiber original filament composites. Under the experimental conditions described in this paper, the 29.59% sizing amount corresponding to 40% sizing agent is the optimal sizing amount of continuous carbon fiber. Compared with the original carbon fiber filament composite, the flexural strength, flexural modulus, tensile strength, interlaminar shear strength and impact strength of the optimal prepreg filament composite were increased by 15.82%, 75.58%, 90.9%, 57.22% and 56.45%, respectively.

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