BAI Yibo1, DING Chengyun1, CHU Qianqian1, LI Wensheng1,2, CHENG Bo1
1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. College of Metallurgical Engineering, Lanzhou Resources & Environment Voc-Tech University, Lanzhou 730123, China
Abstract：Thermal barrier coatings (TBCs) are extensively utilized in the metal hot-end components of aircraft engines. The primary cause of delamination failure of TBCs ceramic layers is deep-seated stresses in the ceramic layer. The present study focuses on the La2Zr2O7/YSZ double-ceramic thermal barrier coating system, which operates at higher temperatures. In the YSZ layer, a Y2O3:Eu3+ fluorescent stress-responsive units were identified, and sintering experiments at 1 300 ℃ were conducted on TBCs. The deep-seated residual stress of TBCs was calculated by combining the Eu3+ fluorescence-stress response equation, and the fluorescence migration mechanism was explained through density functional theory calculations. The results indicate that the detection depth of the stress-responsive unit can reach 100 μm, and the deep layers of TBCs undergo a transition between compressive and tensile stresses. Stress can to induce lattice distortion in the Y2O3:Eu3+ fluorescent stress-responsive unit, leading to changes in its electronic cloud structure, and ultimately resulting in regular changes in optical properties.
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2025, Vol. 30 
