Interactions between Molten Aluminum and Various Refractory Materials
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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