Microstructure and Mechanical Properties of a Glass-ceramic Bond Coated TBC System

BaO–MgO–SiO2 based glass-ceramics was used as bond coat between 8 wt. % yttria stabilized zirconia (8YSZ) top coat and nickel based superalloy substrate of a thermal barrier coating (TBC) system. The glass-ceramic bonded TBC system was characterized in terms of microstructure and mechanical properties (e.g. nanohardness, Young's modulus). The nanohardness and Young's modulus values of 8YSZ top coat, glass-ceramic bond coat and substrate of the TBC system were lower on the cross- section than those obtained on its plan-section.