Some Properties of Ag-Sn-Hg Alloys

Abstract

A study has been conducted to characterize Ag-Sn-Hg alloys with respect to various physical and mechanical properties. Amalgams containing from 0 up to 26 wt% Sn were prepared by the normal trituration and condensation technique. Properties such as structure, strength, expansion, fracture, and corrosion were investigated and correlated. The study showed that maximum expansion in the alloys could be associated with internal voids and consequently minimum strength and vice versa. Fracture in the low tin content alloys was predominately intergranular whereas for the normal amalgam (26 wt% Sn) inter- and intragranular fracture were observed. The existence of a γ₂ network through the bulk of dental amalgam is shown, and it is verified that this is the primary corrodable constituent in the material.