Leadzilver

Leadzilver is a binary alloy of lead and silver produced in laboratories and foundries. It is not a naturally occurring mineral; the term refers to a family of Pb–Ag alloys with varying silver content, resulting in a range of properties.

Composition and structure: The alloy composition is described by weight percent of silver (Ag). A common range studied is from roughly 5% to 40% Ag, with the balance lead (Pb). Within this range, the alloy can exhibit a solid-solution phase or heterogeneous microstructures with dispersed silver-rich domains in a lead-rich matrix. The precise phases depend on cooling rate and composition.

Properties: Leadzilver has a high density relative to many other alloys and a relatively low melting point compared with pure silver. Increasing silver content generally increases electrical conductivity and hardness while raising tensile strength modestly; the lead fraction maintains ductility. The thermal and corrosion behavior is influenced by the silver fraction and the formation of oxide films.

Processing and applications: Produced by melting and alloying Pb and Ag under inert or reducing conditions, followed by casting and controlled cooling. Potential applications discussed in literature include high-density shielding components, electrical contacts, and bearings, where a combination of density, corrosion resistance and conductivity is advantageous. However, cost and lead toxicity limit widespread use.

Safety and provenance: Leadzilver inherits lead’s toxicity; processing requires appropriate controls, ventilation, and waste handling.

Etymology: Named for its constituent elements lead and silver.