X-ray diffraction and electron microscope studies of yttria stabilized zirconia (YSZ) ceramic coatings exposed to vanadia. Master's thesis

Technical Report · Tue Sep 01 04:00:00 EDT 1992

OSTI ID:6766585

Kondos, K G

The U.S. Navy sometimes has the requirement to use low cost fuels containing significant amounts of vanadium and sulfur in gas turbine engines. Unfortunately the yttria stabilized zirconia (YSZ) witch is used as a thermal barrier coating on gas turbine blades can be severely attacked by vanadia. Powders of YSZ containing 8-mol% Y203 and pure zirconia containing various and mounts Of V205 were annealed at 900 deg. C. These were then examined by X-ray diffraction and electron microscopy, as well as single crystals of pure Zro2 and YSZ ( 20% Wt Y203 ) exposed to V205 Melts, to study how the vanadia degrades the YSZ by reacting with the stabilizer to form YVO4 and how the vanadium transforms the cubic and tetragonal YSZ crystal structures to monoclinic which degrades rapidly as a gas turbine blade coating.

• Research Organization: Naval Postgraduate School, Monterey, CA (United States)
• OSTI ID: 6766585
• Report Number(s): AD-A-258055/3/XAB
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
CHALCOGENIDES
CORROSIVE EFFECTS
COST
ELEMENTS
ENGINES
EVALUATION
FUELS
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SULFUR
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TURBINE BLADES
VANADIUM
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES