Numerical Simulation of Excimer Laser Cleaning of Film and Particle Contaminants

Abstract

Laser cleaning is a promising surface preparation technique for applications in high value manufacturing industries. However, understanding the effects of laser processing parameters on various types of contaminants and substrates, is vital to achieve the required cleaning efficacy and quality. In this paper, a two-dimensional transient numerical simulation was carried out to study the material ablation characteristics and substrate thermal effects in laser cleaning of aerospace alloys. Element birth and death method was employed to track the contaminant removal on the surface of the material. The result shows that contaminant ablation increases with laser power and number of pulses. The finite element method (FEM) model is capable enough to predict the optimum number of pulses and laser power required to remove various contaminants. Based on the simulation results, the mechanism of the excimer laser cleaning is proposed. Thus, the use of numerical simulation can be faster and cheaper method of establishing the optimum laser cleaning window and reducing the number of experimental tests.

Investigation of Laser Power Output and Its Effect on Raman Spectrum for Marine Metal Corrosion Cleaning

“…First, our method considers the initial corrosion state of the metal surface quantitatively. Although some research studies mentioned the initial corrosion issue [40][41][42], more of them [43,44] still did not consider the initial corrosion state problem when performing their research studies. Clearly, our research has indicated the initial corrosion will affect the cleaning effect to some extent.…”

Finite element simulation of temperature field in laser cleaning of TA15 titanium alloy oxide film

“…传统的清洗方法包括喷砂喷丸清洗 [6] 、 化学清洗 [7] 、超声波清洗 [8] 、高压水射流清洗 [9] . 这些 人 [10] 数值模拟了准分子激光清洗膜与颗粒的温度场, 并通过实验进行验证激光清洗过程中的机制, 经分析 模拟结果与清洗实验结果一致. Sinha [11] 建立二维热模 型脉冲激光烧蚀理论模型, 通过实验验证模型的正确 性, 同时烧蚀速率没有随激光强度的增加而突然增加, 表明物质的喷射主要是通过正常沸腾机制, 通过模拟 获得合理激光清洗工艺参数, 可以降低材料表面的损 伤. Zhou等人 [12] 通过模拟可知只要选择适当的激光参 数和加工参数, 激光能有效地去除污物.…”

Preparation and Numerical Simulation Investigation of High Reflectance Anti-laser-ablation Coating

“…R and h represent interface thermal resistance and convection heat transfer coefficient, respectively. Besides, model assumed that the densities of the coating and substrate kept a constant, and material properties were isotropic, as well the laser irradiation heating was treated as a surface heat source [20] . The thermal conductivity and heat capacity of material were measured in this work, while h = 10 W/(m 2 •K) and R = 1×10 -3 m 2 •K/W according to the Ref.…”