The deformation behavior of thermally sprayed partially stabilized zirconia (PSZ) coatings are investigated using Hertzian indentation and four-point bend testing, with in situ acoustic emission monitoring. The experimental deformation curves, together with the corresponding acoustic emission responses and the fracture properties of the material are used in defining the deformation characteristics of the coating (ceramic overlay with metallic bond coat where applicable) and substrate composite system. Experiments are aimed in examining the influence of the bond coat and the coating properties on the form of deformation. Substrate temperature and pauses during spraying are demonstrated to strongly effect the coating properties and the resulting fracture/failure characteristics of the composite system. [S0742-4795(00)02503-5]
Issue Section:
Gas Turbines: Ceramics
Keywords:
plasma arc sprayed coatings,
deformation,
acoustic emission testing,
ceramics,
failure (mechanical),
fracture toughness testing,
gas turbines,
thermal barrier coatings,
Plasma Spray,
PSZ,
Coating,
Acoustic Emission,
Mechanical Property
Topics:
Acoustic emissions,
Ceramics,
Coatings,
Deformation,
Failure,
Plasma spraying,
Plasmas (Ionized gases),
Sprays,
Stress,
Thermal barrier coatings,
Testing,
Coating processes,
Spraying (Coating processes),
Temperature,
Composite materials,
Fracture (Process),
Fracture (Materials),
Mechanical properties,
Fracture toughness,
Cooling
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