Laser Treatment of Columnar YSZ Coatings Produced by Suspension Plasma Spraying Free

In this study, columnar yttria-stabilized zirconia (YSZ) topcoats were deposited by suspension plasma spraying (SPS). A laser treatment was used to create a remelted layer at the surface of the SPS coatings. The influence of key laser parameters, such as scanning speed and laser power, on the microstructure of the remelted top layer of the columns in the SPS coatings was investigated. It is hypothesized that such a process could significantly improve the durability and performance of SPS-deposited TBCs by minimizing calcium-magnesium-alumino-silicate (CMAS) penetration.