Laser modification parameters optimization and structural design of thermal barrier coatings

被引：2
|
作者：
Guo L. [1 ,2 ]
Gao Y. [1 ]
Xin H. [1 ]
机构：
[1] School of Materials Science and Engineering, Tianjin University, Tianjin
[2] Tianjin Key Laboratory of Advanced Joining Technology, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2021年 / 42卷 / 07期
基金：
中国国家自然科学基金;
关键词：
High temperature corrosion; Laser modification; Parameter optimization; Structural design; Thermal bBarrier Coatings (TBCs);
D O I：
10.7527/S1000-6893.2020.24114
中图分类号：
学科分类号：
摘要：
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. © 2021, Beihang University Aerospace Knowledge Press. All right reserved.
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