WETTABILITY OF ALUMINIUM WITH SIC AND GRAPHITE IN ALUMINIUM FILTRATION

摘要

The aim of aluminium filtration is to remove inclusions such asAl3C4. For inclusions to be removed they have to come in closecontact with the filter walls composed of Al2O3 or SiC. It istherefore important that the molten aluminium has close contactwith the filter wall. In addition to wetting properties betweeninclusions (Al_4C_3) and molten aluminium, the wettability of thefilter (SiC) by aluminium is determined in sessile drop studies inthe temperature range 1000-1300°C. Wettability changes withtime in three successive steps and improves with time. Todescribe wettability at filtration temperatures employed in theindustry of around 700°C, the results will be extrapolated to thistemperature in future work.