Reaction of some Oxide Ceramics with Molten Aluminium
According to an Ellingham diagram, TiO2 should be reduced, and MgO and Y2O3 should not be reduced by molten aluminium. In an actual reaction of these ceramics with molten aluminium, a reaction at the interface between these ceramics and molten aluminium is very important. At the interface of TiO2 and Y2Ti2O7, a corundum layer was formed, and this layer prevents further reaction. Y2O3 and MgO ceramics reacted with Al to form oxide compounds, metallic Y, and Mg in molten aluminium.