Development of EQ coating for new TBC system in Ni based superalloys

A concept for the EQ coating system for nickel-based superalloys

“…In previous research, [11][12][13][14][15][16][17] a new coating system called an EQ coating was developed in which stable phases that are thermodynamically in equilibrium with the substrate, such as γ ′ phase, have been used as coating materials. With this coating, SRZ formation between the coating and the substrate is suppressed and interdiffusion is minimized because chemical potentials of the alloying elements in the substrate and coating in equilibrium state are equal.…”