Kinetics of spreading in initial stages in metallic systems with differenttypes of interaction between components. IV. Effect of chemical reaction on the kinetics of spreading in tin-iron group metal systems

A droplet flowing over onto a plate introduced from above has been used to study the kinetics of spreading and to describe the observable characterist ics of spreading of tin on iron, cobalt, nickel, and the intermetallic comp ounds Ni3Sn, Ni3Sn2 under a vacuum of (2-4) . 10(-3) Pa at 400-1000 degrees C, droplet mass 0.01-0.06 g. We show by a formal kinetic analysis of exper imental data that in the low-temperature range (400-500 degrees C) the kine tic regime dominates and in the high-temperature range (600-1000 degrees C) the inertial-kinetic regime dominates. In spreading of tin on iron, cobalt nickel, and the intermetallic compounds Ni3Sn and Ni3Sn2 the nature of the interaction corresponds to the phase equilibrium in the studied systems. T he results for the kinetics of spreading of tin on nickel and the intermeta llic compound Ni3Sn showed that spreading of the main bulk is preceded by s preading of a precursor film.