Thermal insulation performance of 7YSZ TBCs adjusted via Al modification

Zhang, Jun-Gui; Tan, Xi; Fan, Xinggang; Mei, Jie; Deng, Chunming; Liu, Min; Zhou, Kesong; Zhang, Xiaofeng

doi:10.1007/s12598-022-02221-9

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…Preparing a double or multiple-layer system is a solution to the problem [17]. Preparing an 8YSZ intermediate transient layer with intermediate thermal expansion performance between the Al 2 O 3 coating and the substrate and good high-temperature endurance can be a way to reduce the thermal residual stress of the coating and prolong its lifespan [18,19]. However, little research analyzes the improvement of fracture resistance by introducing the buffer layer, which is somewhat similar to the notch effect of the fatigue behavior of materials [20].…”

Section: Introductionmentioning

confidence: 99%

Simulating the Effect of Depositing an 8YSZ Buffer Layer in P92/Al2O3 on the Thermal Cycles Endurance and Fracture Toughness of the System

Huang,

Liu,

Wang

et al. 2023

Coatings

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The effect of depositing 8YSZ between serving as an intermediate layer of the P92/Al2O3 was analyzed via finite element analysis. The result shows that depositing an 8YSZ buffer coat beneath the Al2O3 will dramatically decrease the maximum principal stress in the coating system in thermal shock. The stress intensity factor, KI, and J-integral are also decreased which indicates the crack propagation resistance is improved. Inserting a 100 nm 8YSZ buffer layer could reduce the KI and J-integral by 2 orders of magnitude. Thus, cracks are less likely to initiate and propagate. Moreover, coating an 8YSZ layer between the P92/Al2O3 can significantly change the stress distribution pattern in the Al2O3 coating. The 8YSZ with a proper coefficient of thermal expansion between that of the Al2O3 and P92 and good deformability is an ideal buffer layer to improve the thermal cycle endurance and prolong the service life of the Al2O3 coating.

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