Impermeable thin AI2O3 overlay for TBC protection from sulfate and vanadate attack in gas turbines
- University of Pittsburgh
{alpha} - Al{sub 2}O{sub 3} overlay has been deposited on the YSZ surface by the composite-sol-gel route (CSG). Hot corrosion tests were carried out on the TBCs with and without Al{sub 2}O{sub 3} coating in molten salt mixtures (Na{sub 2}SO{sub 4} + 5%V{sub 2}O{sub 5}). The results showed that besides a thin and dense alumina overlay with the thickness of about 100-500 nm formed on the YSZ surface, the microcracks and porous near the surface in YSZ was also occupied by alumina because of penetration of the low viscosity precursor.
- Research Organization:
- University of Pittsburgh
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FC26-01NT41189
- OSTI ID:
- 850476
- Country of Publication:
- United States
- Language:
- English
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