Interface reactions of differently coated carbon-bonded alumina filters with an AZ91 magnesium alloy melt
| Autor: | Anne Schmidt, Tilo Zienert, Benjamin Bock, Christos G. Aneziris, Alina Schramm, André Ditze, Christiane Scharf |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Magnesium Scanning electron microscope Process Chemistry and Technology Spinel chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Filter (aquarium) chemistry Chemical engineering 0103 physical sciences Nano Materials Chemistry Ceramics and Composites engineering Magnesium alloy 0210 nano-technology Layer (electronics) Carbon |
| Zdroj: | Ceramics International. 44:17415-17424 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2018.06.207 |
| Popis: | To investigate possible reactions between differently coated carbon-bonded alumina filters and an AZ91 magnesium alloy melt, immersion tests were carried out. Uncoated as well as MgAl 2 O 4 -, Al 2 O 3 -, nano- (carbon nano tubes/alumina nano sheets) and MgO-C-coated filters were tested. Thermodynamic calculations showed that only magnesia (MgO) and carbon are stable against molten magnesium; alumina (Al 2 O 3 ) and spinel (MgAl 2 O 4 ) will be reduced under the formation of magnesia. Optical and scanning electron microscopy as well as EDX analysis were performed near and at the filter-magnesium alloy-interface of the cooled and sectioned filter samples after their immersion into the AZ91 melt. The results of the thermodynamic calculations were confirmed by the experiments. The MgO-C-coated filter was the only one that did not show an in situ-formed layer on its surface after being in contact with the magnesium alloy melt. The alumina- or spinel-containing filter surfaces displayed platelet-like in situ layers after their contact with the molten AZ91. The results of the EDX analysis of these layers suggest their composition of MgO, since notable respective Mg and O contents were detected, as predicted by the calculations. |
| Databáze: | OpenAIRE |
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