DISSOLUTION OF FERRONICKEL IN A THIN-LAYER OF PD-SI MELT

The dissolution of ferronickel (50 wt% Fe + 50 wt% Ni) in a thin (50-1 00 mu m) layer of Pd-Si melt at 1000 degrees C is studied, The concent ratio n of elements constituting the backing in the melt increases wit h the time of heat treatment (5 to 45 min) and with the increase of si licon content of the initial Pd-Si composition (1.5 to 4.8 wt% Si). Th is agnes with the data on the dissolution of pure nickel in a Pd-Si me lt [1]. Ferronickel dissolves mon actively than nickel owing to the pr esence of iron increasing the activity of silicon in the melt. During solidification on cooling nickel remains essentially in the melt, wher eas iron alloys the solid solution. It is concluded that the partition of backing components between the solid and liquid phases is strongly affected by the strength of bonds between the components of the melt.