热障涂层(thermal barrier coatings, TBCs)被广泛应用于航空发动机金属热端部件,而陶瓷层深层应力是导致TBCs陶瓷层整体剥落失效的核心因素。本文针对服役温度更高的La2Zr2O7/YSZ双陶瓷热障涂层系统,在YSZ层设计制备Y2O3:Eu3+荧光应力响应单元,对TBCs进行1 300 ℃烧结实验,结合Eu3+荧光-应力响应方程计算TBCs深层残余应力,通过密度泛函理论计算解释荧光迁移机制。结果表明：应力响应单元的探测深度可达100 μm,TBCs深层会经历压应力与拉应力的转变。应力会引起Y2O3:Eu3+荧光应力响应单元晶格畸变,使其电子云结构改变,最终导致光学特性规律性变化。
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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