Abstract
Recently, the hybrid cooling system which combined thermal barrier coating (TBC) with the porous ceramic top-coat and transpiration cooling technology has been developed to increase thermal efficiency of land-based gas turbines. In this study, the tensile failure behavior was observed in-situ for the porous TBC and the conventional TBC at ambient and elevated temperatures in order to investigate the fundamental mechanical property. It was found that the porous TBC has a strain accommodation function, and tend to delay the crack propagation and the spallation of the top-coat in comparison with the conventional TBC.
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