Desulfurization of Ni-based super alloys by combined heating and glow discharge
| Autor: | W.P. Allen, S. Rezaie-Serej, R.M. Latanision, R.A. Outlaw |
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| Rok vydání: | 1996 |
| Předmět: |
Glow discharge
Materials science Mechanical Engineering Alloy Metallurgy Metals and Alloys Oxide Temperature cycling engineering.material Condensed Matter Physics Superalloy chemistry.chemical_compound chemistry Mechanics of Materials engineering General Materials Science Grain boundary Spallation Composite material Aluminide |
| Zdroj: | Scripta Materialia. 34:1315-1321 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/1359-6462(95)00666-4 |
| Popis: | The service lifetime of blades and vanes in aircraft gas turbines can be influenced by the degradation of the interface of the Ni-based superalloy and the overlying aluminide coating during cyclic oxidation. Advanced superalloys and coatings rely on formation of a thin and continuous Al{sub 2}O{sub 3} film to protect the base alloy from further oxidative attack at temperatures above 980 C. In order that the Al{sub 2}O{sub 3} scale be protective, it must remain adherent to the underlying alloy under thermal cycling conditions. Recent experimental work indicates that the interfacial binding between Ni and the overlying Al{sub 2}O{sub 3} scale is initially strong, but has also been shown that segregation of indigenous sulfur to the metal/oxide interface induces premature scale spallation, apparently through a reduction in the interfacial adhesive strength with a concomitant reduction in component lifetime. Removal of the sulfur is the best solution to this problem. |
| Databáze: | OpenAIRE |
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