Ablation behavior of monolayer and multilayer Ir coatings under carburizing and oxidizing oxyacetylene flames
| Autor: | Wangping Wu, Zhaofeng Chen, Jinjin Jiang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Aerospace Engineering 02 engineering and technology Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Carburizing chemistry.chemical_compound Coating chemistry Oxidizing and reducing flames Tungsten carbide 0103 physical sciences Oxidizing agent Monolayer engineering Crystallite Composite material 0210 nano-technology |
| Zdroj: | Acta Astronautica. 123:1-7 |
| ISSN: | 0094-5765 |
| DOI: | 10.1016/j.actaastro.2016.03.004 |
| Popis: | Iridium is one of the most promising candidates for protective barrier of refractory materials to endure high service temperature. The multilayer iridium coating was produced by a double glow plasma process on the polished tungsten carbide substrates, compared with monolayer. The ablation behaviors of the monolayer on the unpolished and polished substrates were investigated under carburizing and oxidizing oxyacetylene flames, respectively, at the same time the multilayer coating ablated under oxidizing flames. Multilayer coating was a polycrystalline phase with the preferential (220) orientation. Monolayer on the unpolished substrate had fine coarse grains and some small microcracks were present. Multilayer consisted of columnar grains with some voids between the grains boundaries. The formation of a WIr phase in the as-deposited multilayer was attributed to high deposition temperature. The monolayer could endure high temperature up to 1800 °C in carburizing flame. The substrates could be protected more effectively by multilayer than monolayer at 2000- 2200 °C in oxidizing flame. |
| Databáze: | OpenAIRE |
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