Abstract
In this study, the substrates of Inconel 738-LC superalloy were first sprayed with an NiCrAlY bondcoat and then with a nanostructured scandia (3.6mol%) and yttria (0.4mol%) co-stabilized zirconia (4SYSZ) topcoat by air plasma spraying (APS). Hot corrosion studies of plasma sprayed thermal barrier coatings (TBCs) were conducted in 45wt% Na2SO4+55wt% V2O5 molten salt at 910°C for 300h. The results show that the failure of this TBC occurred in bondcoating layer due to the formation of mixed oxide (NiO, NiAl2O4 and NiCr2O4) in this layer.
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