Point-defect effects on hot corrosion of zirconia-based coatings. Annual report, Jan 91-Jan 92

Technical Report · Thu Jan 16 04:00:00 EST 1992

OSTI ID:5735102

Reidy, R; Simkovich, G

Thermal barrier coatings are vulnerable to certain types of hot corrosion: sulfidation and vanadic attack. Stabilized zirconia, an often used thermal barrier coating, is degraded by dissolution of the stabilizing component (e.g. yttrium oxides). To obtain the dissolution of the stabilizing components, mass transport in the coating must occur. The presence of point defects in a crystalline solid greatly affect the transport properties in that solid. The nature and concentration of these defects can be altered which, in turn, can impart large changes in the transport properties of a material (eg. ionic conductivity and diffusion). In this study, we are determining the defect structure of yttria and ceria-stabilized zirconium oxides. Using electrical conductivity measurements, the activation energies of yttria-stabilized zirconia have been examined as a function of grain size and composition.

• Research Organization: Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
• OSTI ID: 5735102
• Report Number(s): AD-A-245202/7/XAB; CNN: N00014-91-J-1528
• 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
ACTIVATION ENERGY
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
COATINGS
CORROSION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELEMENTS
ENERGY
GRAIN SIZE
IONS
MASS TRANSFER
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
RARE EARTH COMPOUNDS
SIZE
STABILIZATION
THERMAL INSULATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES