MODELING OF INTERPARTICLE INTERACTIONS IN FINELY DIVIDED POWDERED SOLDERS, WITH THE AIM OF REGULATING THE PROPERTIES OF SOLDERING PASTES

The state of the surface of finely divided lead-tin solders has been i nvestigated to determine its influence on the character of interpartic le interactions in nonaqueous media, the structure-forming capabilitie s of the powders, and the properties of soldering pastes based on thes e materials. It has been shown that an increase of the degree of oxida tion of the powdered solders affects the physicochemical properties of the dispersions to the same degree that it produces changes in the su rface parameters that govern the intensity of interparticle interactio ns in the system. Surface modification of the solder particles tends t o change their surface characteristics and the energy of collective in teractions, thus opening up possibilities for regulating the propertie s of soldering pastes.