X-ray diffraction investigation of alpha-Al2O2 addition to yttria stabilized zirconia (YSZ) thermal barrier coatings subject to destabilizing vanadium pentoxide (V2O5) exposure. Master's thesis

Technical Report · Wed Sep 01 04:00:00 EDT 1993

OSTI ID:5383226

Krestos, D M

Since the mid 1970's the U.S. Navy has used Yttria-stabilized zirconia (YSZ) as thermal barrier coatings for hot stage gas turbine components. Use of low cost, high contaminant, fuels has led to shortened component life from failure of YSZ coatings due to corrosive attack by vanadium and other combustion oxides. The object of this investigation was to determine the reactivity of adding alpha-Al2O3 to Current YSZ ceramics for creation of a ceramic composite which could improve mechanical properties and show improved durability to corrosive chemical attack. Ten powder samples of Zro2(8)Mol%YzO3, alpha-Al2O3, and V2Os5 of varying compositions were annealed at 900 deg C for 100 hours. X-Ray Diffraction analysis utilizing a standard 'search and match' method was used to determine the phases present in the reacted powder samples. Peak intensity comparisons between reacted and un-reacted samples allowed for a quantitative determination for the reactivity of a-A12O3 with the YSZ system exposed to V2O3. This investigation indicated that alpha-Al2O3 is non-reactive in all YSZ samples exposed to V2O5 at 900 deg C. Ceramic, Alpha alumina, YSZ, Vanadia, Surface-induced coating (SIC), PSZ, XRD, SEM.

• Research Organization: Naval Postgraduate School, Monterey, CA (United States)
• OSTI ID: 5383226
• Report Number(s): AD-A-273403/6/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES