Thermal barrier coating method and article

摘要

A diffusion aluminide bondcoat is formed on a superalloy substrate and has higher concentrations of Al and Pt and lower concentrations of harmful impurities (e.g. Mo, W, Cr, Ta, S, etc.) at an outermost region of the bondcoat than at an innermost region thereof adjacent the substrate. The bondcoat is heat treated to thermally grow a stable alpha alumina layer on the bondcoat prior to deposition of a ceramic layer.