Study on the processing parameter window for laser cleaning thermal barrier coating

Abstract

In this paper, laser cleaning of thermal barrier coatings is investigated by finite element simulation and experiments. The effect of different parameters on the maximum temperature of the substrate surface during the cleaning process is studied. The results show that the repetition frequency and pulse width have little effect on the maximum temperature of the substrate surface, and the maximum temperature of the substrate surface has an approximately linear relationship with the laser power and an exponential decay relationship with the scanning speed. From the perspective of cleaning efficiency and damage to the substrate, the parameter windows for laser cleaning of thermal barrier coatings were obtained. The highest cleaning efficiency for the top ceramic layer is about 3.02 mm3/s. The highest cleaning efficiency for the bond layer is about 2.17 mm3/s.