Abstract
This study investigates the hot corrosion behaviours of La1-xGdxMgAl11O19 (x = 0, 0.2, 0.4, 0.6, 0.8) bulk ceramics and ceramic coatings. The hot corrosion resistance of the ceramic coating was inferior to that of the bulk ceramic, owing to the formation of an amorphous phase during the plasma spraying process. The smaller size of Gd3+ in comparison with La3+ facilitated the ready combination of Gd3+ with VO43−. LaVO4 was obtained as the corrosion product in the LaMgAl11O19 (LMA) sample. Upon doping the LMA with Gd2O3, the LaVO4 was almost entirely replaced by GdVO4. Therefore, the sacrificial action of GdMgAl11O19 protected the LMA from hot corrosion, while also providing a new method for modifying the corrosion resistance of molten slag.
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