Ultrasonic treating system is used to improve, continuously and on-line, the wettability between carbon fiber and phenolic resin during the process of impregnation. The cavitation and the agitation action in the liquid aroused by ultrasound improve the adsorption, diffusion and wetting of phenolic resin on the surface of carbon fiber, enhance the mechanical properties and finally utilize fully the outstanding property of carbon fiber reinforced composites. The frequency and output amplitude of ultrasonic treating system are calibrated using some experiments to ensure the performance stability of ultrasound. According to the technique feature of preparing carbon fiber/phenolic resin, we establish the ultrasonic treating system. It includes vibrating system, which consists of piezoelectricity transducer and amplitude-transformer, and ultrasonic generator with functions of tracking, velocity stabilizing and current overload protecting. Effects of on-line ultrasonic treatment on the microcosmic interface performance and macrocosmic mechanical properties of composites are investigated. After ultrasonic treatment, the tension strength and interlaminar shear strength of carbon fiber/phenolic resin composites is increased respectively.Acknowledgement: This work was supported by 'the Fundamental Research Funds for the Central Universities', DL10BB19; and �the Natural Science Foundation of Heilongjiang Province, China(Grant No.ZD200914).

Influence of ultrasonic treatment on mechanical performance of carbon fiber/phenolic resin

243rd National Meeting (2012)

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