高温氧化钛合金激光清洗机理与工艺

Laser Cleaning Mechanism and Process of High-Temperature-Oxidized Titanium Alloy

钛合金在高温环境中表面会发生严重氧化,影响后续的加工与使用,采用激光清洗技术去除氧化层,通过高速摄像设备分析氧化层的去除机理,研究激光清洗、机械打磨以及酸洗工艺对试样表面宏观形貌、微观形貌、化学成分、平整性以及显微硬度的影响。结果表明,氧化层的激光去除机理以烧蚀作用为主,通过选择合适的工艺参数清洗后,试样表面氧化物基本除尽,呈现出银白色金属光泽,相比于原始试样,激光清洗试样表面的氧含量大幅降低,平整性优于机械打磨试样与酸洗试样。此外,受到激光清洗过程中热作用的影响,激光清洗试样表面的显微硬度要显著高于机械打磨试样与酸洗试样。

The surface oxidation of titanium alloy will occur severely in a high-temperature environment,affecting subsequent processing and use.Laser cleaning technology was used to remove this oxide layer.A high-speed camera was used to analyze the removal mechanism of the oxide layer.The influences of laser cleaning,abrading,and pickling processes on the macroscopic morphology,microscopic morphology,chemical composition,flatness,and microhardness of the sample surface were studied.The results show that the mechanism of laser removal of the oxide layer was mainly performed through ablation.The oxides on the surface of the samples were removed after cleaning them with appropriate laser parameters,resulting in a silver-white metallic luster.The oxygen content of the samples was significantly lower than that of the original samples,and the surface smoothness was superior to that of the pickling and abrading samples.In addition,due to the thermal effect of the laser cleaning process,the microhardness of the laser cleaning sample surface was significantly higher than that of the abrading and pickling samples.