Mfr. of sintered tungsten compact contg. silver and copper - by sintering the metal powders and impregnating with silver-copper alloy to form alloy used to mfr. electric contacts

摘要

An impregnated composite metal is made of W, Ag, and Cu esp. for use as contacts in energy technology, where a powder mixt. of W, Ag and Cu is sintered to form a skeleton. The skeleton is then impregnated with an Ag-Cu alloy contg. the same wt. ratio of Ag:Cu as the ratio of Ag-Cu in the skeleton. The powder mixt. pref. contains max. 50% of the Ag and Cu in the finished composite; and the skeleton and/or the impregnant may contain a component to assist wetting, e.g. Fe, Ni or Co. The impregnated composite has a uniform structure, leading to reduced burn-off of the electric contact surfaces as compared with conventional materials.