Interactions between Molten Aluminum and Various Refractory Materials

Viktor Schönhof, Werner Schoenwelski, Jens Sperber, Markus Bay

Steuler-KCH GmbH, 56203 Höhr-Grenzhausen/Germany


Volume 6, Issue 4, Pages 76 - 82


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


aluminium, refractories, nitride bond


[1] Schoenwelski, W.; Sperber, J.; Bay, M.: Non-oxidic binding systems of refractory products for metal melts. refractories WORLDFORUM 3 (2013) 73–76 [2] Adabi Firoozjaei, E.; Koshy, P.; Sorrell, C.C.: Effects of AlPO4 addition on the corrosion resistance of andalusite-based low-cement castables with molten Al-alloy, J. Europ. Ceram. Soc. 33 (2013) 1067–1075 [3] Aguilar-Santillan, J.: Wetting of Al2O3 by molten aluminum: The influence of BaSO4 additions. J. of Nanomater. (2008), Article ID 629185, 12 pages [4] Allaire, C.; Guermatzi, M.: Effect of several parameters on corundum growth in aluminium treatment furnaces. J. Canadian Cer. Soc. 69 (2000) [2] 3135 [5] Kollenberg, W.: Technische Keramik. Essen 2004 [6] McLeod, A.D.; Gabryel, C.M.: Kinetics of the growth of spinel, MgAl2O4, on alumina particulate in aluminum alloys containing magnesium. Metallurgical Trans. 23 (1992) [4] 1279–1283 [7] Mouradoff, L.; et al.: Study of the interaction between liquid aluminum and silicon nitride. J. Europ. Ceram. Soc. 13 (1994) [4] 323–328 [8] Nandy, R.N.; Jogai, R.K.: Selection of proper refractory materials for energy saving in aluminium melting and holding furnaces, Int. J. of Metallurgical Engin. 1 (2012) [6] 117–121 [9] Winston Revie, R.: Uhlig’s corrosion handbook. 3rd Ed., Hoboken, NJ, 2011 [10] Routschka, G.; Wuthnow, H.: Praxishandbuch Feuerfeste Werkstoffe, 5th Ed., Essen 2011 [11] Rudolph, S.; Klein, F.: Einsatz von Bornitrid-Schlichten im praktischen Betrieb der Druck- und Kokillengießereien. Gießerei 80 (1993) [8] 256–259 [12] Sarina, B.; Kai, T.; Kvithyld, A.: Wetting of pure aluminium on graphite, SiC and Al2O3 in aluminium filtration. Trans. Nonferrous Met. Soc. China 22 (2012) 1930−1938 [13] Schwabe, U.; et al: Corrosion of technical ceramics by molten aluminium. J. Europ. Ceram. Soc. 9 (1992) 407–415 [14] Siljan, O.-J.; et al.: Refractories for molten aluminium contact, Part I: Thermodynamics and kinetics Refractories Applications and News 7 (2002) [6] 17–25 [15] Zhang, Q.; et al.: Adhesion and non-wetting/ wetting transition in the Al/Al2O3. Interface Phys. Rev. 69 (2004) 045423: 1-11


Göller Verlag GmbH