publisherInvestigations of the wettrability have been carried out by measuring the equilibrium of spreading of liquid Pb-Sn alloy on solid copper under static and isothermal conditions. The results obtained from the experiments made at three different temperatures ranging from 250℃ to 400℃ are summarized as follows: (1) The wettability depends on the temperature and the composition: The maximum spreading of each isotherm is found at the composition of Pb-40% Sn at 250℃, and of Pb-62% Sn at 340℃ and 400℃. And besides, spreading areas show a tendency to decrease at gradually elevating temperatures. (2) From the microscopic observation, a formation of solid solutions is recognized. These are supposed to be ε (Cu3 Sn) and η (Cu6 Sn5) phases.departmental bulletin pape
