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Feasibility study of tungsten as a diffusion barrier between nickel-chromium-aluminum and gamma/gamma prime - delta eutectic alloys
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Young, S. G. Zellars, G. R. |
| Copyright Year | 1978 |
| Description | Coating systems proposed for potential use on eutectic alloy components in high-temperature gas turbine engines were studied with emphasis on deterioration of such systems by diffusion. A 1-mil thick W sheet was placed between eutectic alloys and a NiCrAl layer. Layered test specimens were aged at 1100 C for as long as long as 500 hours. Without the W barrier, the delta phase of the eutectic deteriorated by diffusion of Nb into the NiCrAl. Insertion of the W barrier stopped the diffusion of Nb from delta. Chromium diffusion from the NiCrAl into the gamma/gamma prime phase of the eutectic was greatly reduced by the barrier. However, the barrier thickness decreased with time; and W diffused into both the NiCrAl and the eutectic. When the delta platelets were alined parallel to the NiCrAl layer, rather than perpendicular, diffusion into the eutectic was reduced. |
| File Size | 2005010 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19780007287 |
| Archival Resource Key | ark:/13960/t4wh7cf05 |
| Language | English |
| Publisher Date | 1978-01-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Nickel Alloys Barrier Layers Eutectics Heat Resistant Alloys Tungsten Gas Turbine Engines Diffusion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
