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A physics-based life prediction methodology for thermal barrier coating systems

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Academic year: 2021

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Figure 1  SEM micrographs showing (a) a typical microstructure of a TBC system  (2466 MCrAlY bond coat, EB-PVD YSZ, CMSX4 substrate) after 700 h at 1000  o C,  and (b)  possible initiation sites (see arrows) of interfacial microcracks between the  TGO and
Figure 2  Diagram illustrating the structure of the TBC system and some of the  stresses that are used in determining the failure of the system
Figure 3 Typical damaged area maps measured in the current TBC system (2466  MCrAlY bond coat, EBPVD YSZ on a CMSX4 substrate): (a) photograph of a coated  20 mm diameter test sample after 700 h test at 1000  0 C, (b) typical SEM micrograph  of a failing T
Figure 4  Experimental data showing the effect of oxidising temperature on the time  to TBC spallation for MCrAlY type coatings and for PtAl based TBCs (triangles)
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