Research Progress and Prospects of Laser Remelting of Thermal Sprayed YSZ TBCs

Abstract:

Thermal barrier coatings (TBCs) can effectively reduce the actual operating temperature of hot-end components of advanced turbines and engines and improve their service reliability and durability. Yttria-stabilized zirconia (YSZ) TBCs are currently the most mainstream thermal barrier coating system, but as the thrust-to-weight ratio continues to increase, higher requirements have been placed on the performance of YSZ TBCs. As an important surface strengthening technique, laser remelting has been proven by many researchers to be used to strengthen YSZ TBCs and improve their overall performance. In this paper, the effects of laser remelting on the microstructure and properties of thermal sprayed YSZ TBCs and the strengthening mechanism are reviewed, including their microstructure, phase composition, thermal shock resistance, high- temperature oxidation resistance, calcium-magnesium-aluminum-silicon (CMAS) corrosion resistance and foreign-particle erosion resistance. Finally, the future development of this technique is discussed, which provides valuable reference for the research and application of thermal sprayed YSZ TBCs by laser remelting.