Hot corrosion behaviour of plasma sprayed YSZ/LaMgAl(11)O(19) composite coatings in molten sulfate-vanadate salt

Hot corrosion studies of thermal barrier coatings (TBCs) with different YSZ/LaMgAl(11)O(19) (LaMA) composite coating top coats were conducted in 50 wt.% Na(2)SO(4) + 50 wt.% V(2)O(5) molten salt at 950 degrees C for 60 h. Results indicate that TBCs with composite coating top coats exhibit superior oxidation and hot corrosion resistances to the TBC with the traditional YSZ top coat, especially for which has a LaMA overlay. The presence of LaMA can effectively restrain the destabilization of YSZ at the expense of its own partial degradation. The hot corrosion mechanism of LaMA coating and the composite coatings have been explored. (C) 2011 Elsevier Ltd. All rights reserved