Isothermal oxidation of physical vapor deposited partially stabilized zirconia thermal Barrier coatings

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 chara...

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Bibliographic Details
Published in:Journal of materials engineering and performance 1994-02, Vol.3 (1), p.55-60
Main Authors: SOHN, Y. H, BIEDERMAN, R. R, SISSON, R. D
Format: Article
Language:English
Subjects:
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360205 - Ceramics, Cermets, & Refractories- Corrosion & Erosion
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
CORROSION PRODUCTS
Cross-disciplinary physics: materials science
rheology
CRYSTAL-PHASE TRANSFORMATIONS
DATA
Exact sciences and technology
EXPERIMENTAL DATA
FAILURES
HEAT TREATMENTS
INFORMATION
MATERIALS SCIENCE
MICROSTRUCTURE
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
Physics
Surface treatments
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VAPOR DEPOSITED COATINGS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
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Description
Summary: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.
ISSN:1059-9495
1544-1024
DOI:10.1007/BF02654499