摘要
随着高端制造向轻量化、高性能方向发展,异质材料的高效连接技术已成为轨道交通、航空航天等行业的关键.铝合金与碳纤维增强热塑性复合材料(CFRTP)的异质轻质结构的需求日益强烈.为了实现二者的高强度连接,基于熔融沉积成形(FDM)技术,在1.5 mm厚的6061Al表面直接打印碳纤维增强聚酰胺6(CF-PA6)丝材,以实现铝合金/CFRTP复合结构的一体化制造.研究了打印温度和表面微织构对于6061Al/CF-PA6 FDM打印接头的影响规律和界面连接机理.结果表明,温度决定树脂熔融状态及润湿铺展特性,从而直接影响界面结合强度,直接打印时,打印温度270℃,接头拉剪力为885 N,抗拉强度达到2.2 MPa.为进一步提升接头强度,采用纳秒脉冲激光在铝合金表面制备微结构,结果表明,微结构可增大表面粗糙度,并促进熔融树脂在铝合金表面的润湿铺展,在优化的工艺参数下,树脂能完全填充铝合金表面的微结构.连接界面通过机械嵌合效果有效提升了接头的性能,接头拉剪力为1 764 N,拉伸剪切强度达到4.4 MPa.
As high-end manufacturing advances towards lightweight and high-performance directions,the efficient joining technology of heterogeneous materials has become critical in industries including rail transportation and aerospace.The demand for heterogeneous lightweight structures composed of Al and carbon fiber reinforced thermoplastic(CFRTP)is increasingly intense.To achieve high-strength joining between the two materials,based on the fused deposition modeling(FDM)technology,carbon fiberreinforced nylon 6(CF-PA6)filaments were directly printed on the surface of 6061Al with a thickness of 1.5 mm,thereby realizing the integrated manufacturing of Al/CFRTP composite structures.The influence mechanisms and interfacial bonding mechanisms of printing temperature and surface microtextures on 6061Al/CF-PA6 FDM-printed joints were investigated.The results show that the temperature determines the melting state and wetting-spreading properties of the resin,thereby directly affecting the interfacial bonding strength.For direct printing at 270℃,the joint’s tensile shear force is 885 N,and the tensile-shear strength reaches 2.2 MPa.To further improve the joint strength,microstructures were fabricated on the surface of Al using a nanosecond pulsed laser.The results show that the microstructures can increase the surface roughness and promote the wetting and spreading of the molten resin on the surface of Al.Under optimized process parameters,the resin can fully fill the microstructures on the surface of Al.The mechanical interlocking effect at the joining interface effectively improves the performance of the joint.The tensile shear force of the joint is 1764 N,and the tensile-shear strength reaches 4.4 MPa.
作者
檀财旺
李奇戈
苏健晖
刘福运
覃春林
林丹阳
宋晓国
TAN Caiwang;LI Qige;SU Jianhui;LIU Fuyun;QIN Chunlin;LIN Danyang;SONG Xiaoguo(State Key Laboratory of Precision Welding&Joining of Materials and Structures,Harbin Institute of Technology,Harbin,150001,China;Harbin Institute of Technology,Weihai,Qingdao Research Institute,Harbin Institute of Technology(Weihai),Qingdao,266109,China;Shandong Provincial Key Laboratory of Special Welding Technology,Harbin Institute of Technology(Weihai),Weihai,264209,China)
出处
《焊接学报》
北大核心
2025年第11期1-9,共9页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(52074097)
上海市复杂薄板结构数字化制造重点实验室开放课题(202502)。
关键词
金属/树脂基复合材料
熔融沉积成形
一体化制造
界面调控
激光刻蚀
机械嵌合
metal/resin-matrix composite
fused deposition modeling
integrated manufacturing
interfacial regulation
laser etching
mechanical interlocking
