层间熨平法增强熔丝制造CF/PEEK复合材料的力学性能  

Enhanced Mechanical Properties of CF/PEEK Composites Fabricated by the Fused Filament Fabrication through the Interlayer Ironing Method

作　　者：雷奶琴 阿依古丽·喀斯木 乌日开西·艾依提[1] 董兰兰[1] 贾儒[1] LEI Naiqin;KASIMU Ayiguli;AIYITI Wurikaixi;DONG Lanlan;JIA Ru(School of Intelligent Manufacturing Modern Industry(School of Mechanical Engineering),Xinjiang University,Urumqi 830017,China)

机构地区：[1]新疆大学智能制造现代产业学院(机械工程学院),新疆乌鲁木齐830017

出　　处：《塑料工业》2024年第10期75-82,共8页China Plastics Industry

基　　金：新疆维吾尔自治区自然科学基金项目(2020D01C067);国家自然科学基金项目(52065063)。

摘　　要：为减小熔丝制造(FFF)3D打印碳纤维增强聚醚醚酮(CF-PEEK)复合材料的孔隙率,提高其力学性能,提出一种层间熨平方法,即打印完一层后,喷嘴不挤出材料,并再次在这一层表面压过“熨平”。采用FFF工艺制备了CF/PEEK复合材料试样,通过单因素试验研究了扫描间距和层间熨平角度对CF/PEEK复合材料力学性能的影响。使用微米X射线三维成像系统对试样的内部孔隙缺陷进行表征。结果表明,当扫描间距为0.3 mm,纤维质量分数为10%时,无熨平CF/PEEK试样的孔隙率为1.91%,拉伸强度为78.5 MPa,弯曲强度为111.2 MPa。采用层间熨平法可以显著降低CF/PEEK复合材料试样的孔隙率,提高其力学性能。0°和90°熨平后,扫描间距为0.5 mm的CF/PEEK试样的孔隙率分别降低了74.08%和72.48%,拉伸强度分别提高了49.89%和41.98%,弯曲强度分别提高了20.66%和15.99%。当纤维质量分数为10%时,扫描间距0.3 mm的CF/PEEK试样的力学性能最佳,0°熨平的拉伸强度为90.9 MPa,90°熨平的弯曲强度为126.1 MPa。研究表明,层间熨平是一种降低孔隙率和提高力学性能的简单而有效的方式。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.

关 键 词：熔丝制造 碳纤维增强聚醚醚酮 层间熨平 孔隙率 力学性能 

分 类 号：TQ324.8[化学工程—合成树脂塑料工业]