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Thermal barrier coatings (TBCs) of plasma sprayed yttria stabilised zirconia (YSZ) are increasingly utilised for heat exposed components of advanced gas turbines1,2. An important reason for the application of zirconia coatings is the low thermal conductivity of this ceramic material which is further diminished in a TBC by the high concentration of spraying induced microstructural defects, e.g. crack-shaped...
This study concerns the method for examining the load conditions and evolving stress related to debonding at the coat-substrate interface to identify the responsible factors, by indenting a ceramic coated specimen with a spherical indenter either through impact or quasi-statically under static loading. The morphology of cracks induced by the impact of a foreign object on to specimens of inconel substrate...
The mixed-mode fracture behavior of plasma-sprayed ZrO2-8 wt% Y2O3 thermal barrier coatings was determined in air at 25 and 1316°C in asymmetric four-point flexure with single edge v-notched beam (SEVNB) test specimens. The mode I fracture toughness was found to be KIc=1.15±0.07 and 0.98±0.13 MPa $$ \sqrt m $$ , respectively, at 25 and 1316°C. The respective mode II fracture toughness...
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