Abstract
Failure behavior of thermal barrier coatings (TBCs) was investigated by using of a new testing system. The system consists of a "can" type of combustion system and a servo-electro hydraulic material testing system, and it can apply thermo-mechanical loadings to a test sample in a simulated gas turbine combustion environment. By means of this apparatus, failure behavior of a thermal barrier coating (TBC) specimen was studied under a condition of cyclic burner heating on which a constant tensile load was superimposed. The experimental results demonstrated that the test samples indicate as the non-elastic elongation as topcoat clacking. The strain rate of sample deformation was remarkably higher than laboratory creep tests. Thermo-mechanical deformation model, took account the effect of temperature gradient in the substrate, can give one possible understanding on the higher strain rate.
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