Tin Oxide

Silver tin Oxide (AgSnO2) based contacts since their introduction are looked upon as potential replacement for AgCdO. The AgSnO2 contacts have seen continued improvisation, with respect to their applicability and performance, by enhancement in their fine microstructure.AgSnO2 based contacts are increasingly dominating the market for medium and high current contact relays because of their low arc erosion. Besides the base oxide SnO2 embedded in the Ag matrix, these materials may or may- not contain additives like Bi2O3, CuO, In2O3, WO3 and MoO3 in a combination of varying amounts not exceeding 2%. The AgSnO2 based contacts are manufactured by powder metallurgy (powder blending, compaction and sintering) followed by extrusion drawing rolling to the final dimensions.