Abstract

The surface of stainless-steel (SS) mesh was modified by growing carbon nanotubes (CNTs) from ethanol flame. The CNT-modified SS mesh was then used as a heating element for the resistance welding of glass-fibre-reinforced polyetherimide (GF/PEI) laminates to improve the interfacial bond strength of SS wire and PEI resin. Interfacial microstructure, the mechanical properties of the welded joint and the effects of CNT growth time (t_g) on the wettability of PEI resin solution to SS wire were investigated. The results indicate that the addition of CNTs increased wettability due to the capillary action of high-porosity CNT coating. The microstructure of the welded joints changed with t_g, and the thickness of the welding implant layer decreased below t_g = 10 min, and the maximum single lap shear strength (SLSS) value of the welded joint was 39.2 MPa when t_g = 10 min. The strengthening mechanism of CNTs and the failure modes of the welded joints were also elucidated in detail by the interfacial shear strength (IFSS) between SS wire, PEI resin and the fractography analysis.

摘要

通过从乙醇火焰中生长碳纳米管 (CNT) 来改性不锈钢 (SS) 网的表面。然后将 CNT 改性的 SS 网用作玻璃纤维增​​强聚醚酰亚胺 (GF/PEI) 层压板电阻焊接的加热元件，以提高 SS 线和 PEI 树脂的界面结合强度。研究了界面微观结构、焊接接头的机械性能以及 CNT 生长时间 ( t _g ) 对 PEI 树脂溶液对 SS 线的润湿性的影响。结果表明，由于高孔隙率 CNT 涂层的毛细管作用，CNT 的添加增加了润湿性。焊接接头的显微组织随t _g发生变化，焊接植入层厚度在t以下减小。_g = 10 min，当t _g = 10 min时，焊接接头的最大单搭接剪切强度（SLSS）值为 39.2 MPa。通过SS丝、PEI树脂之间的界面剪切强度（IFSS）和断口分析，还详细阐明了碳纳米管的强化机制和焊接接头的失效模式。