Abstract

This experimental study is devoted to a phenomenological and quantitative investigation of the physics of spreading kinetics of eutectic lead solder systems (Pb-63Sn) over Cu6Sn5/Cu3Sn/Cu (IMC) substrates. The spreading kinetics was studied experimentally by using real-time in situ monitoring of the triple-line movement. Data gathering was facilitated by a hot-stage microscopy system under a controlled atmosphere. Three intermetallic surfaces with different heat treatment conditions were used for this investigation. Dramatically more pronounced spreading of Pb-63Sn on all intermetallic Cu6Sn5/Cu3Sn/Cu substrates compared with Cu substrates was observed, along with a much larger spreading area. Hence the physics/chemistry of spreading over IMCs significantly differs from the spreading of the same system over a virgin Cu substrate. A power-law initial stage of spreading was confirmed, and the corresponding power-law exponents were determined as a function of substrate topography.

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