Abstract
Coating systems have been proposed for potential use on eutectic alloy components in high temperature gas turbine engines. In a study to prevent the deterioration of such systems by diffusion, a tungsten sheet 25 μm thick was placed between eutectic alloys and an Ni-Cr-Al layer. Layered test specimens were aged at 1100°C for as long as 500 h. Without the tungsten barrier the δ phase of the eutectic deteriorated by diffusion of niobium into the Ni-Cr-Al. Insertion of the tungsten barrier stopped the diffusion of niobium from the δ phase. Chromium diffusion from the Ni-Cr-Al into the γ/γ' phase of the eutectic was greatly reduced by the barrier. However, the barrier thickness decreased with time, and tungsten diffused into both the Ni-Cr-Al and the eutectic. When the δ platelets were aligned parallel rather than perpendicular to the Ni-Cr-Al layer, diffusion into the eutectic was reduced.
Published Version
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