SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS
A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 3 - February 10, 2006
07 AIRCRAFT PROPULSION AND POWER
Includes primary propulsion systems and related systems and components, e.g., gas turbine engines, compressors, and fuel systems; and onboard auxiliary power plants for aircraft.
For related information see also 20 Spacecraft Propulsion and Power; 28 Propellants and Fuels; and 44 Energy Production and Conversion.
20060005144 Pittsburgh Univ., PA, USA
Impermeable thin Al2O3 Overlay for TBC Protection from Sulfate and Vanadate Attack in Gas Turbines. Quarterly Progress Report, (October 1, 2004-January 31, 2005)
Mao, S. X.; Jan. 2005; 14 pp.; In English Report No.(s): DE2005-850475; No Copyright; Avail.: Department of Energy Information Bridge
25 (micro)m and a 2 (micro)m thick Al(sub 2)O(sub 3) overlay were deposited by HVOF thermal spray and by sol-gel coating method, respectively, onto to the surface of YSZ coating. Indenter test was employed to investigate the spalling of YSZ with and without Al(sub 2)O(sub 3) overlay after hot corrosion. The results showed that Al(sub 2)O(sub 3) overlay acted as a barrier against the infiltration of the molten salt into the YSZ coating during exposure, thus significantly reduced the amount of M-phase of ZrO(sub 2) in YSZ coating. Thick Al(sub 2)O(sub 3) overlay will increase compressive stress and failure in TBC. NTIS
Corrosion Resistance; Gas Turbines; Protection; Protective Coatings; Sulfates; Thermal Control Coatings; Vanadates
20060005157 Pittsburgh Univ., PA, USA
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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.; Apr. 2005; 14 pp.; In English Report No.(s): DE2005-850476; No Copyright; Avail.: Department of Energy Information Bridge
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. NTIS
Corrosion Resistance; Gas Turbines; Protection; Protective Coatings; Sulfates; Thermal Control Coatings; Vanadates
Source: NASA
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