| Autor: |
Bacior, Magdalena, Sobczak, Natalia, Homa, Marta, Turalska, Patrycja, Kudyba, Artur, Bruzda, Grzegorz, Nowak, Rafał, Pytel, Andrzej |
| Předmět: |
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| Zdroj: |
Transactions of the Foundry Research Institute / Prace Instytutu Odlewnictwa; 2017, Vol. 57 Issue 4, p375-384, 10p |
| Abstrakt: |
The wetting behavior and reactivity between molten cast iron (originally vermicular graphite cast iron, containing in wt. %: 3.70 C, 2.30 Si, 0.44 Mn, 0.054 P, 0.017 Mg, 0.015 S) and commercial polycrystalline alumina (Al2O3 substrate of 99.70% purity and less than 3 vol. % porosity) were investigated. The wettability test was performed under an inert flowing gas atmosphere (Ar, 850-900 hPa) at a temperature of 1450°C for 15 min using a sessile drop method combined with classical contact heating procedure. The high temperature interaction between molten cast iron sample and Al2O3 substrate was continuously recorded with a high-speed high-resolution CCD camera. The results showed that the molten cast iron does not wet the Al2O3 substrate (θ = 131°). After wettability test, the cross-sectioned sessile drop couple was examined using scanning electron microscopy coupled with X-ray energy dispersive spectroscopy. It was found that in the solidified cast iron drop, the graphite phase took the shape of flakes having a different dispersion degree, i.e. vermicular precipitates of graphite did not re-grow during solidification of the drop. Moreover, structural characterization of the drop/substrate interface revealed the layer of about 26 μm thick composed mainly of carbon and located at the drop-side interface while at the substrate-side interface, the reaction zone (∼70 μm) formed due interaction between Al2O3 and molten cast iron was well distinguished. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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