Interaction of Fecralloy with sodium disilicate glass

Interactions of sodium disilicate glass with Fecralloy, Fe-6Cr-4Al-0.25Y, have been analysed in terms of the Pask chemical equilibrium theory. Sessile drops assumed contact angles of 38 to 47‡ at 900 to 1100‡C on polished substrates following interactions that led to significant weight losses. Up to 7% of aluminium and much smaller amounts of iron, chromium manganese and yttrium were taken into the glass. On pre-oxidized substrates, coated with alumina, near-perfect wetting was achieved but once more aluminium was taken into the glass and weight losses suffered. These data can be interpreted as resulting from redox reactions between the aluminium in the alloy and the sodium monoxide in the glass.