Numerical Simulation and Experimental Investigation of Laser Ablation of Al2O3 Ceramic Coating

Abstract

This paper presents an evaluation of the molten pool laser damage done to an Al2O3 ceramic coating. Mechanism analysis of the laser damage allowed for a 2D finite element model of laser ablation of the Al2O3 ceramic coating to be built. It consisted of heat transfer, laminar flow, and a solid mechanics module with the level set method. Results showed that the laser damage mechanisms through laser ablation were melting, gasification, spattering, and micro-cracking. The ablation depth and diameter increased with the increasing laser ablation time under continuous irradiation. The simulation profile was consistent with the experimental one. Additionally, the stress produced by the laser ablation was 3500–9000 MPa, which exceeded the tensile stress (350–500 MPa), and fracturing and micro-cracks occurred. Laser damage analysis was performed via COMSOL Multiphysics to predict laser damage morphology, and validate the 3D surface profiler and scanning electron microscope results.

Microfluidic system manufacturing by direct laser writing for the generation and characterization of microdroplets

“…In pursuit of DLW-based techniques, stereolithography [33][34][35]39], laser ablation [40,41], selective laser sintering [36,42], micromachining and those based on photon absorption, are few of the techniques involved in this search and each of them presents different opportunities in terms of the structure size that can be reached and the 2D and 3D complexity [32], for example, stereolithography process has been mainly used for the fabrication of 'chips' at the micro-and submicroscales [33,34]. This search is narrowed down to devices based on microdroplet generators by adding filters as 'microfluidics' and 'droplets', so less than one hundred articles were found.…”

Study on the single pulse ablation characteristics of SiC ceramics by infrared femtosecond laser

“…Further, the dissociation process of 4H-SiC irradiated by laser was discussed. Liu et al 7 established a model based on COMSOL multi-physics simulation platform to simulate the evolution of alumina ceramic coating, and designed experiments to verify the simulation results. The experimental results show that the damage mechanisms of laser ablation on the coating surface include melting, gasification, splashing and micro-cracks.…”

Application of a Finite Element Model to Obtain the Influence of the Treatment’s Power, Reflecion and Focal Diameter in Laser Texturing of Aluminum

“…The obtained result depends on the characteristics of the laser machine: scanning speed, repetition rate, average power, laser beam spot, diameter, and pulse duration. Fiber lasers [3], YAG [4] and others are suitable for laser texturing. The duration of the impact varies widely, using nanosecond [5], picosecond [6] and femtosecond lasers [7], [1].…”

“…Laser texturing is applicable to various materials, such as metals and their alloys, superalloys [8], ceramics [3], wood [9], composite materials [10] and others. Due to its wide application in industry, aluminum and its alloys are the subject of increased research, including regarding the possibilities of its laser processing [11].…”

“…Most often, the modeling of laser texturing by the FEM to determine the resulting dimples is reduced to solving the problem of determining the temperature field by using the law of thermal conductivity. Regarding the considered area, the problem to be solved can be one-dimensional [13], twodimensional [3], two-dimensional -axisymmetric [17] or three-dimensional [18], [9]. Depending on the number of set pulses, the models are for one pulse [9], for one transition [14] and several transitions [16].…”