This paper investigates welding of carbon/epoxy and carbon/PEEK composites using the following procedure. Firstly, the carbon/epoxy composite was made “weldable” through a very thin PEI thermoplastic film co-cured on its surface. During the curing cycle, the PEI resin and the components of the epoxy resin system partially diffused into each other generating a gradient interphase between the original epoxy and PEI resins. Subsequently, the carbon/PEEK composite adherend was welded onto the PEI-rich surface of the weldable carbon/epoxy adherend, exploiting the total miscibility between PEI and PEEK. Thermal degradation of the carbon/epoxy adherend during the welding process was avoided via the ultra-short heating times enabled by the ultrasonic welding technology. In this research, mechanical testing was used to evaluate the weld strength relative to reference joints. Additionally, cross-section scanning electron microscopy was used to assess the morphology of the PEI/epoxy interphase before and after the welding process.

本文使用以下程序研究碳/环氧树脂和碳/ PEEK复合材料的焊接。首先，通过非常薄的表面共固化的PEI热塑性塑料薄膜使碳/环氧复合材料“可焊接”。在固化周期中，PEI树脂和环氧树脂体系的组分彼此部分扩散，从而在原始环氧树脂和PEI树脂之间产生梯度界面。随后，利用PEI和PEEK之间的总溶混性，将碳/ PEEK复合被粘物焊接到可焊接的碳/环氧被粘物的富PEI的表面上。通过超声波焊接技术实现的超短加热时间，避免了碳/环氧被粘物在焊接过程中的热降解。在这项研究中 机械测试用于评估相对于参考接头的焊接强度。另外，在焊接过程之前和之后，使用截面扫描电子显微镜来评估PEI /环氧树脂中间相的形态。