Effect of pre-oxidation on the isothermal and cyclic oxidation behaviour of cold-sprayed NiCoCrAlY coating
| Autor: | Deping Lu, Lixue Zhang, X. J. Ning, Lei Wang, Shao-qing Xie |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Oxide Gas dynamic cold spray engineering.material Condensed Matter Physics Isothermal process chemistry.chemical_compound chemistry Coating Mechanics of Materials Phase (matter) engineering General Materials Science Spallation Growth rate Composite material Layer (electronics) |
| Zdroj: | Materials Research Innovations. 19:S9-258 |
| ISSN: | 1433-075X 1432-8917 |
| Popis: | The effects of vacuum pre-oxidation treatment on the isothermal and cyclic oxidation behaviour of a cold-sprayed NiCoCrAlY coating are investigated. It is found that the cold-sprayed NiCoCrAlY coating has a dense structure with low oxygen content and consists of a single γ-matrix phase. A uniform and continuous α-Al2O3 layer with a thickness of 0.47 ± 0.02 μm can be obtained by pre-oxidation treatment in a vacuum environment. The pre-oxidation treatment decreases the growth rate of thermally grown oxide by the formation of Al2O3 with larger grain sizes and thus improves the thermal cyclic life of coating. Surface-geometry imperfections are the source of initial spallation of thermally grown oxide. |
| Databáze: | OpenAIRE |
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