KINETICS OF REACTIVE SPREADING IN METALLIC SYSTEMS WITH VARIOUS TYPESOF COMPONENT INTERACTION

The kinetics of the initial stages of the spreading process in binary metallic systems with different types of component interactions was de termined. The effects of temperature, drop weight, and mutual solubili ty of the contacting liquid and solid phases on rates of spreading in binary systems of tin and copper with metals of the iron family, and a lso of tin with the intermetallic compounds Ni3Sn and Ni3Sn2, were inv estigated, using a method in which drop was brought into contact with a plate descending from above. The rate of displacement of the three-p hase boundary in the spreading process was a power function of time, a nd the difference of cosines of the quasi-equilibrium and dynamic cont act angles varied exponentially with time. The method of analysis used was suitable for treatment of data obtained under non-stationary cond itions of the initial spreading process. The nature of contact interac tions was in accord with phase equilibria in the systems with tin that were investigated.