Enhanced Mechanical Properties of CF/PEEK Composites Fabricated by the Fused Filament Fabrication through the Interlayer Ironing Method
To reduce the porosity and improve the mechanical properties of fused filament fabrication(FFF)3D printed carbon fiber-reinforced polyetheretherketone(CF-PEEK)composites,an interlayer ironing method was proposed.It means that after printing a layer,the nozzle does not extrude the material,but presses over the surface of this layer again to"iron".The CF/PEEK composite specimens were fabricated by the FFF process,and the effects of scan spacing and interlayer ironing angle on the mechanical properties of CF/PEEK composites were investigated by a single-factor test.The internal pore defects of the specimens were characterized by using a micron X-ray 3D imaging system.The results show that when the scan spacing is 0.3 mm and the fiber mass fraction is 10%,the porosity of the unironed CF/PEEK specimens is 1.91%,the tensile strength is 78.5 MPa,and the bending strength is 111.2 MPa.The interlayer ironing method could significantly reduce the porosity of the CF/PEEK composite specimens and improve their mechanical properties.After ironing at 0° and 90°,the porosity of CF/PEEK specimens with a scan spacing of 0.5 mm is decreased by 74.08%and 72.48%,the tensile strength is increased by 49.89%and 41.98%,and the bending strength is increased by 20.66%and 15.99%,respectively.When the scan spacing is 0.3 mm and the fiber mass fraction is 10%,the CF/PEEK specimen has the best mechanical properties,showing a tensile strength of 90.9 MPa at 0° ironing and a bending strength of 126.1 MPa at 90° ironing.Research shows that the interlayer ironing is a simple and effective way to reduce porosity and improve mechanical properties.
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维普
