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Optimization Design and Performance Verification of the CeYSZ/Al2O3 Double Ceramic Layer Thermal Barrier Coatings Structure Parameters

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Publicat a:Journal of Thermal Spray Technology vol. 33, no. 8 (Dec 2024), p. 2698
Autor principal: Zhao, Yuecen
Altres autors: Wu, Yongjin, Tao, Tianlang, Li, Li, Wang, Quansheng, Ding, Guifu, Zhang, Congchun
Publicat:
Springer Nature B.V.
Matèries:
Thermal cycling
Verification
Coatings
Sensitivity analysis
Optimization
Thermal insulation
Protective coatings
Thickness ratio
Ceramics
Service life
Hypercubes
Thermal barrier coatings
Multiple objective analysis
Design
Stress concentration
Heat conductivity
Composite materials
Thermal stress
Neural networks
Radial basis function
Temperature
Numerical models
Thermal barriers
Mathematical models
Sensors
Objective function
Aluminum oxide
Insulation
Design optimization
Parameters
Thermal shock
Latin hypercube sampling
Environmental
Accés en línia:Citation/Abstract
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Resum:Double ceramic layer thermal barrier coatings (DLC-TBCs) are favored for combining the benefits of top and bottom ceramic materials. The thickness ratio of the top and bottom ceramic layers significantly impacts the performance of the DLC-TBCs. In the design process, it is generally desired to balance its thermal insulation properties with a long service life. Therefore, this study establishes a multi-objective parameter optimization design method based on NSGA-II to optimize the thickness of the CeYSZ/Al2O3 DCL-TBCs. Experimental verification of the coating performance was conducted based on the optimization results. Firstly, based on theoretical and numerical models, a quantitative analysis was conducted on the effects of the thickness of each material in the CeYSZ/Al2O3 DCL-TBCs system on thermal insulation and thermal stress. Space parameters were obtained using optimal Latin hypercube sampling, and a radial basis function (RBF) neural network surrogate model was constructed based on the numerical calculation results. Sensitivity analysis was employed to evaluate the impact of the total thickness of the TBCs and the thickness of the Al2O3 ceramic layer on the objective function. Finally, NSGA-II was utilized for optimization. The obtained Pareto optimal solution set was validated, showing that the performance of the CeYSZ 190 μm/Al2O3 120 μm DLC-TBCs satisfied the requirements. Therefore, TBCs of different thicknesses were sprayed and subjected to thermal insulation and thermal shock experiments. The results demonstrated that the optimized TBCs significantly improved service life without compromising thermal insulation, providing a new approach for the subsequent design of DLC-TBCs structures.
ISSN:1059-9630
1544-1016
DOI:10.1007/s11666-024-01868-3
Font:Materials Science Database