关键词: 自动铺放, T700/PEEK, 粉末悬浮法, 热塑性预浸纱, 含胶量, 孔隙率

Abstract: To meet the demand for high performance thermoplastic composites applied to Automated Fiber Placement (AFP) technology, the key technological parameters and mechanical properties of T700 carbon fiber reinforced PEEK (Polyetheretherketone) prepreg manufactured by the slurry method were studied. The influences of different technological parameters (slurry concentration, ultrasonic power, tension, pulling speed, impregnation temperature, rolling temperature, and roller gap) on the quality of the prepreg in the process of continuous carbon fiber impregnated by PEEK were analyzed, and the Scanning Electron Microscope (SEM) was used to verify the porosity and observe the interface morphology of T700/PEEK prepreg. Interlaminar shear strength and tensile strength of the unidirectional composite laminate molded by T700/PEEK prepreg was also tested. The results show that resin content was in linear positive correlation with slurry concentration, and increased with magnifying ultra-sonic power. In the impregnation process, the width and porosity of prepreg decreased with the increase of temperature increment and pulling speed, and as the tension increased, the width of prepreg increased, but the porosity decreased. In the rolling process, with the increase of the temperature and the decrease of the roller gap, the width of prepreg increased and the porosity decreased. The processing parameters were all taken into consideration to obtain the optimum parameters as follows:impregnation temperature 360-370℃, rolling temperature 330℃, roller gap 0.1 mm, pulling speed 20-25 mm/s and tension 7 N. T700/PEEK prepreg with the porosity of 1.8% was produced. SEM photograph confirms that the interface between T700 carbon fiber and PEEK bonded well, and the interlaminar shear strength was up to 73.43 MPa and longitudinal tensile strength was up to 1.71 GPa.

Key words: Automatic Fiber Placement (AFP), T700/PEEK, slurry method, thermoplastic prepreg, resin content, porosity