X-Ray Diffraction and Electron Microscope Studies of Yttria Stabilized Zirconia (YSZ) Ceramic Coatings Exposed to Vanadia.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1992
- Accession Number
- ADA258055
Entities
People
- Kostandinos G. Kondos
Organizations
- Naval Postgraduate School