Interactions between Molten Aluminum and Various Refractory Materials

Markus Bay, Viktor Schönhof, Werner Schoenwelski, Jens Sperber

Steuler-KCH GmbH, 56203 Höhr-Grenzhausen/Germany

Revision

Volume 6, Issue 4, Pages 76 - 82

Abstract

Different interactions between molten aluminum (AlMg5-alloy) and various refractory materials are investigated by crucible tests. The test samples were analyzed by: • Macroscopic investigation • Microscopic investigation • scanning electron microscope (SEM) • X-ray diffraction (XRD). Corrosion mechanisms and reaction products were studied. Results show that the most important criterion for SiC-bricks is the binding system. Silicate-bonded products show intense infiltration. In contrast nitride-bonded SiC proved to be very resistant against molten aluminum. The investigation shows that the resistance of alumosilicate materials depends on the SiO2 content of the brick. Accordingly, the corrosion resistance of bauxite bricks is better compared to andalusite bricks. High-purity corundum are resistant to Al-melts, but because of the porosity mechanical infiltration takes place related to porosity. The formation of spinel could not be confirmed

Keywords

aluminium, refractories, nitride bond

References

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