Thermal barrier coating system having no bond coat

摘要

A coated article is prepared by melting and casting an article substrate formed of a nickel-base superalloy. The article substrate is heated in a hydrogen-containing atmosphere at a temperature of at least 2000 DEG F. for a period sufficient to desulfurize the substrate to a sulfur content of less than about 1 part per million. Optionally, an aluminum-oxide environmental coating is provided overlying the substrate. A ceramic thermal barrier coating is applied overlying the substrate. Significantly, there being no bond coat applied to the substrate prior to the application of the thermal barrier coating.