Fig. (5) Wettability of the vertical quartz glass plate by Ni-40.5at.%Nb melt at 1250 °C: (A) τ=5min, 1- alumina crucible, 2-the melt, 3- the interaction products, 4- a view of the interaction products through the glass, 5- the plate without the melt; (B) τ=15min; (D) τ=30min; (D) a typical fragment of the reaction layer detached from the quartz after cooling, 1- the melt/interaction products boundary, 2- the quartz glass/interaction products boundary.