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The morphology of the interface between the TBC and the underlying bond coat was analyzed by Scanning Electron Microscopy (SEM).
The delamination of the TBCs occurred mainly within the TBC, several to tens of microns above the interface between the TBC and bond coat.
The undulations are shown to be associated with local separations near the interface between the TBC and the thermally grown alumina scale.
The large thermal expansion mismatch between the CMAS and TBC and the extra strain energy stored in the CMAS layer can lead to delamination cracks between the TBC and bond coat (BC).
At periodic interfacial sites, the thermally grown oxide (TGO) that forms between the TBC and the bond coat at high temperature displaces into the bond coat with each thermal cycle.
The formation of NiAl2O4 spinel in between the TBC and the α-Al2O3 should be avoided, since this can lead to premature failure along the spinel/α-Al2O3 interface.
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They announced three new collections, the XNSLR, the TBC, and the SL.
Interfacial stress singularity at the test support edge is evaluated and effects of various Young's modulus ratios between the TBC layer and substrate are shown.
Nanoindentation revealed only small differences in mechanical properties between the TBC systems and a finite element crack growth analysis showed that such small differences did not cause any significant change in the crack driving force.
This resistance is attributed to the formation of a sealing layer made of crystalline Ca apatite phase (based on Ca2Gd8(SiO4)6O2) as a result of the high-temperature chemical interactions between the APS Gd2Zr2O7 TBC and the CMAS glass.
Tables 3 and 4 shows between-group comparisons for the PTT, TBC and distribution of individuals among the different severity levels of valleculae residue.
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