Method of forming platinum-silicon-enriched diffused aluminide coating on a superalloy substrate.

摘要

A platinum-silicon powder is electrophoretically deposited on a nickel- or cobalt-base superalloy substrate (12). The deposited powder is heated to form a transient liquid phase on the substrate (12) and to initiate diffusion of Pt and Si into the substrate (12). An aluminium-chromium powder is then electrophoretically deposited on the Pt-Si enriched substrate and diffusion heat-treated to form a corrosion- and oxidation-resistant Pt-Si-enriched diffused aluminide coating (14) on the substrate (12). The presence of both Pt and Si in the aluminide coating (14) unexpectedly improves coating ductility as compared to a Pt-enriched diffused aluminide coating without Si on the same substrate material.