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.
Highlights
In recent years, the rapid development of high-energy laser weapons has meant that aircraft and space vehicles are threatened by laser weapons [1]
For the Al2 O3 ceramic: φ = 1; For the air: φ = 0; To simulate the vaporization and back stamping mechanism generated in the laser irradiation process, the technology in [17] was used in this paper
When the melting point (Tm) < T < Tv, mass flow entered the liquid ceramic at a different speed, and evaporation led to mass removal when T > Tv
Summary
The rapid development of high-energy laser weapons has meant that aircraft and space vehicles are threatened by laser weapons [1]. When the laser intensity is high enough, the irradiated material surface will undergo complex physical processes, such as melting, vaporization, and even ionization that forms a plasma. Developed a two-dimensional model to study the melting and vaporization breaking effect on materials during laser irradiation. In 2005, based on the one-dimensional temperature model, Zhang et al [8] studied the ablation characteristics in detail, considered the dynamic boundary and dynamic absorption rate changes with time under the laser ablation material, and described the physical mechanism of the laser ablation process. In this paper, according to the current research needs regarding the aviation laser protective material Al2 O3 , an ablation experiment platform was built based on a high-power continuous solid-state laser. The simulated and experimental results of the physical processes of laser ablation are reported
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