In this work, laser surface treatment and laser induced breakdown spectroscopy (LIBS) were combined to improve process control of surface treatment and pre-bond surface characterization to measure the reduction in silicone content. This approach addresses guidelines provided by the Federal Aviation Administration (FAA) in Advisory Circular 20–107B focused on improved process controls, as well as the goals of the NASA Advanced Composites Project focused on reducing the timeline to certification. A picosecond laser was used to surface treat poly (ether ether ketone) (PEEK)/carbon fiber composites using two different wavelengths (355 and 1064 nm). The same laser was used to characterize the PEEK surfaces for silicone contamination before and after laser treatment via LIBS. Preliminary experiments were conducted using a rapid screening methodology whereby up to 12 laser treatment conditions were compared by failure mode analysis on a single sample. The panel was subsequently cobonded with an adhesive to an epoxy matrix prepreg and mechanically tested. Coupon level tests were then conducted with a down-selected set of laser treatment conditions. Additional characterization was conducted on laser treated panels including water contact angle measurement, scanning electron microscopy, and X-ray photoelectron spectroscopy (XPS). The results showed that laser treatment parameters strongly influence the adherend surface and subsequent bond performance. XPS and LIBS measurements agreed well for assessment of silicon (Si) concentration. Also, post-ablation silicon-to-carbon (Si/C) ratios from LIBS measurements were correlated with the fracture toughness and observed failure modes from double cantilever beam testing.

在这项工作中，将激光表面处理和激光诱导击穿光谱法（LIBS）结合起来可以改善表面处理的过程控制能力，并进行预粘结表面表征以测量有机硅含量的降低。这种方法可以解决由美国联邦航空管理局（FAA）在第20–107B号咨询通告中提供的指南，该指南的重点是改进过程控制，以及NASA先进复合材料项目的目标是缩短认证时间。皮秒激光用于使用两种不同的波长（355和1064 nm）对聚醚醚酮（PEEK）/碳纤维复合材料进行表面处理。在通过LIBS进行激光处理之前和之后，使用相同的激光来表征PEEK表面的有机硅污染情况。使用快速筛选方法进行了初步实验，其中通过单个样品的失效模式分析比较了多达12种激光处理条件。随后将面板与粘合剂共粘合到环氧基质预浸料上，并进行机械测试。然后使用一组向下选择的激光处理条件进行优惠券水平测试。在经过激光处理的面板上进行了其他表征，包括水接触角测量，扫描电子显微镜和X射线光电子能谱（XPS）。结果表明，激光处理参数强烈影响被粘物表面和随后的粘结性能。XPS和LIBS测量非常适合评估硅（Si）浓度。也，