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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (20): 428507-428507.doi: 10.7527/S1000-6893.2023.28507

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Effect of thermal aging on mechanical properties of thermal barrier coatings interface and numerical calculation

Yankuan LIU1,2, Hang YUAN1,2, Dinghe LI3(), Yujie FEI1,2   

  1. 1.Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China,Tianjin  300300,China
    2.College of Aeronautical Engineering,Civil Aviation University of China,Tianjin  300300,China
    3.Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin  300300,China
  • Received:2023-02-01 Revised:2023-02-06 Accepted:2023-05-12 Online:2023-10-25 Published:2023-05-26
  • Contact: Dinghe LI E-mail:dh-li@cauc.edu.cn
  • Supported by:
    National Natural Science Foundation of China(U1933102);Scientific Research Project of Tianjin Education Commission(2020KJ016)

Abstract:

To investigate the effect of Thermally Grown Oxide (TGO) on the life of thermal barrier coating system, Yttria Stabilized Zirconia (YSZ) was prepared by Atmospheric Plasma Spray (APS) method. Thermal barrier coating was subjected to thermal aging tests at 1 100 ℃ for different durations. Micro morphology of the coatings was observed and analyzed by Scanning Electron Microscopy (SEM), then the interfacial fracture toughness and internal stress of the coating were measured by the interfacial indentation method and the Almen specimen bending method, respectively. The effects of TGO on the coating properties were systematically studied. Meanwhile, the dynamic Thermo-Mechanical Coupling Extended Layer-by-Layer/Solid Element (TM-XLW/SE) method was used to numerically study the problem. The extended layer-by-layer method was used to simulate the behavior between the Top Coat (TC)/TGO and the Bond Coat (BC)/TGO. The alloy matrix was constructed by eight-node solid element. According to the displacement, temperature coordination and internal force balance conditions of the connection area between the thermal barrier coating and the substrate, the thermal barrier coating and the substrate were coupled with each other. The influence of the evolution of TGO thickness on the mechanical properties of the thermal barrier coating under thermal aging was analyzed. The numerical results were compared with the experimental conclusions, which provides further support and evidence for the failure analysis of thermal barrier coatings.

Key words: thermal barrier coatings, thermally grown oxide, interfacial fracture toughness, dynamic thermal coupling, extended layer wise/solid element

CLC Number: