Effects of Long Term Thermal Aging on Mechanical Properties of Top Coat in A TBC System

Abstract

Effects of process variables and the long term thermal exposure on adhesion strength of top coat in a APS-TBC were studied. The experiments indicated the adhesion strength was significantly changed, under the influences of many factors; e.g., pore ratio, elastic moduli, TGO formation, intersplats microcracks. Some discussions were made on the the physical meanings of the JIS test.