Mathematically modeling of water jet-assisted ultraviolet-laser machining of thermal barrier coatings
Focusing on the problems that micro-structures of thermal barrier coatings have recast layer and micro-cracks, a new technology of water jet-assisted ultraviolet-laser machining is presented in this study. Ultraviolet laser beam in the water jet is directly focused on the surface of thermal barrier coatings. Micro-structures of thermal barrier coatings are etched by the photochemical effect. Meanwhile, water jet effectively cleans the etched material. Therefore, it is realized that micro-structures of thermal barrier coatings has no recast layer to improve machining quality. The cooling effect of water jet in the ultraviolet-laser machining is considered. Temperature field model, flow field model and the coupling relation model of water jet-assisted ultraviolet-laser machining are built. Moreover, the process of numerical simulation is designed and the results of simulation process are analysed to reveal the forming law. The validity of the model is verified by experiment.