| Abstract: |
Ceramic thermal barrier coatings (TBCs) are potential tools to increase the durability of metal parts operating in turbine engines. In this work, partially yttria stabilized zirconia (YSZ) coatings were deposited by plasma spraying on stainless steel substrates. A combination of optical microscopy and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis was used to evaluate the microstructural characteristics. Tensile bond strength tests were carried out, in this study, following requirements stated in the standard ASTMC633-79. In the computational analyses, the methodology based on the combination of oriented finite element and a non-linear finite element was conducted to determine elastic-plastic properties of TBCs. Due to the complexity of the coatings and difficulty of conducting tensile test, The elastic-plastic behavior law optimized from instrumented indentation tests allowed calculating the coating adhesion. A comparison between the experimental results was also investigated. On the other hand, a three-dimensional of interfacial indentation model with the incorporation of fracture by XFEM was developed to analyze the crack propagation.
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