Abstract
La2Ce2O7 (LC) has been identified as a promising thermal barrier coating (TBC) for use up to 1250 °C. In this study, a TBC system was deposited on grit-blasted Inconel 738 using atmospheric plasma spraying (APS) with NiCrAlY as the bond coat, followed by YSZ, and then LC as the top layer. The coatings were exposed to a mixture of molten Na2SO4 (45 wt.%) and V2O5 (55 wt.%) at 950 °C for hot corrosion. On the top LC layer, LaVO4, CeVO4 and CeO(1.66–2.00) formed as hot corrosion products after 4 h exposure. A reaction between YSZ and the corrosion products could not be observed due to the absence of YVO4. The hot corrosion mechanism of the LC-based TBC is also discussed in this study.
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