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Electrical contacts are manufactured with conductive metals, like electrolytic copper and its alloys. These products are used in electric circuits to manage the electrical energy. Electrical contacts assemblies can be built up by brazing joining methods, which improves electrical and thermal conductivity in non-ferrous substrates. The cadmium oxide, present into electrical contact alloys, has been replaced by tin oxide due to environmental issues, to meet the actual internationals agreements. The objective of this work is to evaluate the brazeability of a filler metal 40%Ag-21%Zn-20%Cd-19%Cu, on non-ferrous substrates, like: electrolytic copper, brass (65%Cu-35%Zn), silver and silver tin-oxide (90%Ag10%SnO2) using sessile drop and edge tests. The results showed that the brazeability of all non-ferrous substrates depicted contact angles less than 10o, except for the silver-tin oxide substrate. For silver-tin oxide substrate dewetting took place and the measurement of contact angles was impossible.

Estudo da brasabilidade de contatos elétricos por metal de adição 40%Ag-21%Zn-20%Cd-19%Cu.