La2Zr2O7/YSZ双陶瓷热障涂层的深层应力荧光检测

doi:10.19976/j.cnki.43-1448/TF.2025013

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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.

Key words： thermal barrier coating fluorescence stress stress response nondestructive testing

Received: 18 February 2025 Published: 27 November 2025

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	BAI Yibo
	DING Chengyun
	CHU Qianqian
	LI Wensheng
	CHENG Bo

Cite this article:

BAI Yibo,DING Chengyun,CHU Qianqian, et al. Fluorescence detection of deep-seated stresses inside La₂Zr₂O₇/YSZ double-ceramic thermal barrier coatings[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(5): 405-413.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2025013 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I5/405

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