Impermeable thin AI2O3 Overlay for TBC Protection from Sulfate and Vanadate Attack in Gas Turbines. (Quarterly Report, February 1, 2005-April 30, 2005).

Mao, S. X.

Technical Information Center Oak Ridge Tennessee

关键词: Gas turbines;    Barrier coatings;    Corrosion resistance;    Protective coatings;    Yttrium oxides;   

RP-ID  :  DE2005850476

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

a 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) + (sub 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.