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- W4297105503 abstract "The thermal barrier coatings (TBCs) often fail by spallation close to the bond coat (BC) - top coat (TC) interface due to the stress induced by the growing of thermally grown oxide layer (TGO) on the rough surface of BC as the oxidation time or temperature increase. The evolution of bond coat roughness during exposure at high temperatures is critical for the lifetime of thermal barrier coatings (TBCs) and cannot be assessed by conventional methods after the top coat was deposited. A non-contact method was developed based on the image analysing and scanning electron microscopy (SEM) techniques to evaluate the BC/TC interface roughness at different stages of oxidation at high temperatures. Mathematical algorithms were applied to extract and process the roughness profile from the SEM images acquired on the BC-TC interface and calculate the roughness parameters Ra, Rp, Rq, and Rz. To measure the accuracy of the developed method, a roughness profile generated on the surface of a roughness specimen using a conventional stylus profilometer was passed through the processing routine and different filters to determine the average line for roughness profile and calculate the roughness parameters. The applicability of the non-contact method was shown on plasma- sprayed TBCs with conventional and nanostructured yttria-stabilised zirconia (YSZ) top coats with the same NiCrAlY bond coat deposited on IN 625 substrate. The TBCs specimens were subjected to isothermal oxidation tests at 1100°C for 100, 200, 300, 400, and 600 hours and the roughness parameters Ra, Rp, Rq and Rz from the metal/ceramic interface were calculated. It was found that isothermal oxidation affects the roughness parameters, increasing the TGO layer and mixed oxides." @default.
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- W4297105503 date "2022-01-01" @default.
- W4297105503 modified "2023-09-26" @default.
- W4297105503 title "Image analysis algorithms for measuring the interfacial roughness in TBCs systems" @default.
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- W4297105503 doi "https://doi.org/10.1063/5.0101629" @default.
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