A silver-copper-germanium-silicon-boron alloy for investment casting

摘要

A silver-copper-germanium-silicon-boron alloy suitable for investment casting comprises (by weight): at least 77 % silver and 0.2-3 % germanium. Silicon is present in an amount to give a clean silvery appearance to the casting, e.g. 10 ppm 0.2 % and boron is present in an amount to impart grain refinement, e.g. up to 40 ppm. The alloy can either be zinc free or comprise 0.2-1.0 % zinc.