Abstract
Degradation due to molten salt attack is one of the failure mechanisms of thermal barrier coatings. Thermochemical attack of the salt mixture Na2SO4–30mol% NaVO3 on ZrO2–8mol% YO1.5 (8YSZ) at 1100°C for different times was investigated. In the present study, 8YSZ powder was synthesized using co-precipitation route. The graded morphologies and phase compositions were examined using SEM, XRD and Raman before and after hot corrosion test. The results obtained from XRD have shown that m-ZrO2 and YVO4 were the main corrosion products after hot corrosion test at 1100°C. The results obtained from SEM and EDS observations have shown that large polyhedron crystals of m-ZrO2 and rod-like crystals of YVO4 formed as hot corrosion products after hot corrosion test for 6h and 24h. The phase transformation and chemical interaction are the primary corrosion mechanisms for degradation of 8YSZ ceramic.
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