WETTABILITY OF ALUMINIUM WITH SIC AND GRAPHITE IN ALUMINIUM FILTRATION

摘要

The aim of aluminium filtration is to remove inclusions such asrnAl3C4. For inclusions to be removed they have to come in closerncontact with the filter walls composed of Al_2O_3 or SiC. It isrntherefore important that the molten aluminium has close contactrnwith the filter wall. In addition to wetting properties betweenrninclusions (Al_4C_3) and molten aluminium, the wettability of thernfilter (SiC) by aluminium is determined in sessile drop studies inrnthe temperature range 1000-1300℃. Wettability changes withrntime in three successive steps and improves with time. Torndescribe wettability at filtration temperatures employed in thernindustry of around 700℃, the results will be extrapolated to thisrntemperature in future work.