Isothermal oxidation of physical vapor deposited partially stabilized zirconia thermal barrier coatings
- Worcester Polytechnic Inst., MA (United States). Materials Engineering Labs.
Thermal barrier coatings (TBCs), consisting of physical vapor deposited (PVD) partially stabilized zirconia (PSZ, 8 wt.% Y[sub 2]O[sub 3]) and a diffusion aluminide bond coat, were characterized as a function of time after oxidative isothermal heat treatment at 1,373 K in air. The experimental characterizations was conducted by X-ray diffraction analysis and scanning electron microscopy (SEM) with energy-dispersive spectroscopy. During cooling to room temperature, spallation of the PSZ ceramic coatings occurred after 200 and 350 h of isothermal heat treatment. This failure was always sudden and violent, with the TBC popping from the substrate. The monoclinic phase of zirconia was first observed on the bottom surface of the PVD PSZ after 200 h of isothermal heat treatment. The failure of TBCs occurred either in the bond coat oxidation products of [alpha]Al[sub 2]O[sub 3] and rutile TiO[sub 2] or at the interface between the oxidation products and the diffusion aluminide bond coat or the PSZ coating.
- OSTI ID:
- 7166429
- Journal Information:
- Journal of Materials Engineering and Performance; (United States), Journal Name: Journal of Materials Engineering and Performance; (United States) Vol. 3:1; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
Similar Records
Failure of PVD/plasma sprayed thermal barrier coatings during thermal cycling
Bond strength and stress measurements in thermal barrier coatings
Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
CORROSION PRODUCTS
CRYSTAL-PHASE TRANSFORMATIONS
DATA
EXPERIMENTAL DATA
FAILURES
HEAT TREATMENTS
INFORMATION
MICROSTRUCTURE
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VAPOR DEPOSITED COATINGS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES