Preparation and mechanical properties of nano Al₂O₃-carbon fiber multi-scale reinforced polyamide composites

Laminated film compression-molding was used to fabricate nano Al₂O₃-carbon fiber multi-scale reinforced PA6 matrix (nano Al₂O₃-CFF/PA6) composite laminates. The effect of molding temperature, compression pressure and nano Al₂O₃ content on the properties of nano Al₂O₃-CFF/PA6 laminates were investigated by FESEM, thermogravimetric analysis/differential scanning calorimetry simultaneous thermal analyzer(TGA/DSC) and FTIR. The results show that the flexural strength, interlaminar shear strength, and parallel/vertical impact strength of the CFF/PA6 laminates reach 250.3 MPa, 87.6 MPa, 41.2 MPa and 9.6 MPa while they are fabricated at 230℃, 3 MPa holding 15 min. When the content of nano Al₂O₃ in the matrix reaches to 6wt%, the corresponding mechanical strength of nano Al₂O₃-CFF/PA6 laminated composite are 387.6 MPa, 35.7 MPa, 80.3 MPa and 25.6 MPa, respectively.