| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Melt Processing, Casting and Recycling
|
| Presentation Title |
Oxidation of Aluminium Melts in Dry and Moist Atmospheres |
| Author(s) |
Halvor Dalaker, Martin Syvertsen |
| On-Site Speaker (Planned) |
Halvor Dalaker |
| Abstract Scope |
The aluminium casthouse is responsible for substantial amounts of CO2 emissions. Substituting low-emissions hydrogen for fossil fuels such as LNG and LPG would significantly reduce the climate im-pact of aluminium casting. Such a fuel-switch would also change the combustion products, eliminating CO2 and increasing the amount of H2O, potentially up to 100 % in the case of oxy-fuel combustion. As a critical factor in aluminium casting is the loss of metal due to oxidation and dross-formation, it will be necessary to have a good understanding of how the oxidation behaviour is influenced by the compo-sition of the atmosphere. In this paper, we study how oxidation and dross formation on an AlSi7MgSr alloy changes for different atmospheres containing 40 % H2O vs. 20 % O2. We find no temperature dependency of oxide and dross formation in the temperature range 670 °C to 750 °C. While inert pro-cess gas provides sufficient stirring for noticeable oxidation due to interactions with the laboratory air at the surface, the use of oxidising process gas significantly increases dross formation, by a factor 3-4. Comparing dross formation with 40 % H2O vs. 20 % O2, we find that 20 % O2 gives significantly more dross, despite the total molar amount of oxygen atoms being constant in these gas mixtures. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Sustainability, Other |