Abstract
In present work the coatings having lanthanum-titanium-aluminium oxide that is LaTi2Al9O19 (LTA) in combination with yttria stabilized zirconia (YSZ) and alumina (Al2O3), were developed using plasma spray method. Thus the top coat comprises of LTA/YSZ/Al2O3 ceramic top layer. The coatings were tested for type I hot corrosion in presence of Na2SO4 and NaCl salts in 3:1 mass proportion at 900 °C for 100 h. LTA 150 (having LTA top coat of thickness 150 μm) as-sprayed and annealed samples have shown excellent hot corrosion resistance upto 100 h. XRD patterns indicate that the LTA and Al2O3 phases were retained even after 100 h of isothermal hot corrosion with slight decrease in their peak intensity. Hot corrosion of alumina incorporated LTA coating resulted in the formation of LaAlO3, Na2Al2O4, NaAlO2.
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