热障涂层的激光表面改性参数优化和结构设计

doi:10.7527/S1000-6893.2020.24114

Abstract

Abstract: Thermal Barrier Coating (TBC) is one of the key technologies of aero engine turbine blades, but it often fails prematurely due to the corrosion resulting from environmental deposits and molten salts under service conditions. Laser surface modification has been considered as an effective way to improve the corrosion resistance of TBCs, but the laser process optimization and structure design of the modified coating need to be studied urgently. In this study, the surfaces of Y₂O₃ partially stabilized ZrO₂ (YSZ) TBCs are modified by a pulsed Nd: YAG laser system. The results showed that the laser modified layer had a dense columnar crystal microstructure, and longitudinal cracks ran through it. The thickness of the modified layer was directly proportional to the laser power, little affected by the scanning speed, and inversely proportional to the beam length. When the laser power is too high, more cracks formed in the modified layer; when the beam length increased, the interface defects between the modified layer and the underlying coating increased, harmful to the interface bonding. The optimized laser modification parameters are: the laser power was 75-80 W, the scanning speed is 8 mm/s, and the beam length is 160 mm. A double-layer laser modified layer is designed. The longitudinal cracks in each layer are discontinuous, which made the whole modified layer free of longitudinal cracks, helpful to suppress the infiltration of corrosion melt at high temperatures.

Key words: Thermal bBarrier Coatings (TBCs), high temperature corrosion, laser modification, parameter optimization, structural design

CLC Number:

V259

GUO Lei, GAO Yuan, XIN Hui. Laser modification parameters optimization and structural design of thermal barrier coatings[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(7): 424114-424114.

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Laser modification parameters optimization and structural design of thermal barrier coatings

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