碳纤维复合材料损伤高频脉冲激光去除技术

High Frequency Pulse Laser Removal Technology for Damaged Part of Carbon Fiber Reinforced Plastics

采用高频脉冲紫外激光(λ=355 nm)对碳纤维/环氧树脂基复合材料进行逐层剥蚀加工,运用响应曲面法分析了激光功率、扫描速度、光斑填充间距3个因素与剥蚀深度的交互性。使用扫描电子显微镜、三维形貌仪、接触角测量仪、X射线光电子能谱仪,对试样表面的显微组织和理化性能进行分析,并对不同表面处理后试样界面剪切强度进行研究。结果表明:当激光参数P=13 W,d=0.02 mm,v=1000 mm/s时,激光加工形貌较好,剥蚀深度h=389μm;与砂纸打磨相比,使用紫外激光对材料进行逐层剥蚀时,不会对碳纤维骨架造成损伤;紫外激光剥蚀后的试样表面粗糙度比原始表面提高了7.9倍左右,高出不同砂纸打磨后的试样表面粗糙度约2.4~4.4倍;使用紫外激光剥蚀后的材料表面活性提高,含氧官能团数量增加;激光剥蚀处理后界面剪切强度明显增大,与砂纸打磨及未处理表面相比分别提高了48.5%和17.9%。

A high frequency pulsed ultraviolet(UV)laser(λ=355 nm)was used to strip the carbon fiber/epoxy resin plastics ply-by-ply.The interaction between the laser power,scanning speed and spot filling distance and the stripped depth was analyzed by response surface method.Scanning electron microscopy(SEM),3D profiler,contact angle measurement,X-ray photoelectron spectroscopy(XPS)were used to analyze the morphology and physical and chemical properties of the surface of samples,and to study the interface shear strength of the sample after different surface treatments.Results show that the morphology of laser processing is good,and the stripped depth h=389μm under the parameters of p=13 W,d=0.02 mm and v=1000 mm/s.Compared with sandpaper grinding,the carbon fiber skeleton will not be damaged when the materials are stripped ply-by-ply by UV laser.The surface roughness of the samples after UV laser stripped is about 7.9 times higher than that of the original surface,which is also higher than that after sandpaper grinding.The surface roughness of the samples are about 2.4 to 4.4 times and the surface activity of the material is improved and the number of oxygen-containing functional groups increases after the UV laser stripped.The interface shear strength obviously increases after the laser ablation treatment,which is 48.5%and 17.9%higher than that of the sand paper and the untreated surface,respectively.