碳纤维加热元件的制备及其对热塑性复合材料电阻焊接接头性能的影响

Preparation of carbon fiber heating elements and their effects on the properties of resistance welding joints in thermoplastic composite materials

本文采用聚醚醚酮(PEEK)粉末悬浮浸渍工艺和PEEK树脂膜熔融浸渍工艺制备了两种不同的薄层碳纤维展宽布加热元件,并对碳纤维增强聚醚醚酮复合材料层合板的电阻焊接技术进行了实验研究。结果表明:采用“埋入式”电极布置方式,有效避免了电阻焊接过程中因加热元件裸露而产生的“边缘效应”现象。加热时间对焊接接头强度有明显的影响,接头强度随加热时间先增加后减小,在120 s时达到最大值28.1 MPa,断口失效模式从最初的粘接失效变为植入体与纤维的混合失式模式。对比粉末悬浮浸渍与熔融浸渍两种工艺制备的加热元件相应的焊接接头强度,在相同焊接工艺条件下前者相比后者提升15%。

This paper presents the preparation of two types of thin-layer carbon fiber stretched-width cloth heating elements using the suspension impregnation process with polyether-ether-ketone(PEEK)powder and the melt impregnation process with PEEK resin film.The resistance welding technology for carbon fiber reinforced polyether-ether-ketone composite laminates was experimentally investigated.The results demonstrated that employing an“embedded type”electrode arrangement effectively mitigates the“edge effect”caused by exposed heating elements during resistance welding.Moreover,it was found that the heating time significantly influences the strength of welded joints,which initially increases and then decreases,reaching a maximum value of 28.1 MPa at 120 s.Additionally,the fracture failure mode has changed from initial adhesive failure to a mixed failure mode of implant and fiber.Furthermore,compared to melt impregnation,powder suspension impregnation process enhance joint strength by 15%under identical welding conditions.