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Thermo-mechanical fatigue (TMF) tests of a Ni-base superalloy thermal barrier coating (TBCs) specimen were carried out, where the experimental variables were the phase angle between mechanical strain/temperature, and the maximum and minimum temperatures. A computed tomography system was employed to inspect the internal damage inside of the TBCs. Whereas several types of fracture modes were seen depending on the TMF test conditions, the delamination cracks were specific along the bond/top coat interface in the ceramic top coat, which might be nucleated as an influence of thermally grown oxide (TGO). Special focus was paid to get basic understandings on the underlining failure mechanism and the quantification of the ceramic top coat delamination. For this purpose a new mechanistic model…
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Thermo-mechanical fatigue (TMF) tests of a Ni-base superalloy thermal barrier coating (TBCs) specimen were carried out, where the experimental variables were the phase angle between mechanical strain/temperature, and the maximum and minimum temperatures. A computed tomography system was employed to inspect the internal damage inside of the TBCs. Whereas several types of fracture modes were seen depending on the TMF test conditions, the delamination cracks were specific along the bond/top coat interface in the ceramic top coat, which might be nucleated as an influence of thermally grown oxide (TGO). Special focus was paid to get basic understandings on the underlining failure mechanism and the quantification of the ceramic top coat delamination. For this purpose a new mechanistic model was proposed by analyzing the internal stress around the TGO in this work. By the model the delamination crack growth process is reasonably estimated, on the basis of interface fracture mechanics (Fig. 1) .