Patent ID: 6340500
Filing Date: 2002-01-22
Classification: C23C,Y10T

Abstract:
A method of improving the thermal fatigue life of a thermal barrier coating system that comprises a thermal barrier coating adhered to a diffusion aluminide bond coat on a surface of a component, the method comprising the steps of:depositing the bond coat on the component so as to be characterized by substantially columnar grains that extend substantially through that portion of the bond coat overlying the surface of the component, the grains having grain boundaries exposed at the surface of the bond coat, the grain boundaries defining grain boundary ridges at the surface of the bond coat; peening the surface of the bond coat at an intensity of at least 6A up to 12A and with a coverage of at least 100% to flatten at least some of the grain boundary ridges and thereby form flattened grain boundary surfaces; and then depositing the thermal barrier coating on the surface of the bond coat.