Use of powdered gold alloys for the manufacture of jewelry items by selective laser fusion

摘要

Use of a yellow or red or white gold powder alloy of 18K, 14K, 10K or 9K for the manufacture of jewelry items layer by layer by laser selective fusion (SLM) that includes a melting stage of each alloy layer of gold by at least one laser beam, where the powder alloy consists of: (A) from 37.5% to 38.5% by weight or from 41.7% to 42.5% by weight or 58.5 % to 59.5% by weight or 75% to 76% by weight of gold (Au); (B) from X% to Y% by weight of a first element; (C) from X '% to Y'% by weight of a second element; (D) from 0.01% to 3% by weight of at least one metalloid; and the usual impurities; wherein the percentages by weight are percentages by weight with respect to the total weight of the alloy; wherein the at least one metalloid is selected from the group consisting of: germanium (Ge), silicon (Si), boron (B), tellurium (Te), phosphorus (P) or selenium (Se) or a mixture of two or more thereof; in which the alloy is free of gallium (Ga), platinum (Pt) and tin (Sn); and in which - if the alloy is a yellow or red gold alloy: (B) X is 10, Y is 55, the first element is copper (Cu); (C) X 'is 2, Y' is 15, the second element is silver (Ag); and the yellow or red gold alloy is free of palladium (Pd); - if the alloy is a white gold alloy: (B) X is 10, Y is 50, the first element is palladium (Pd); (C) X 'is 10, Y' is 50, the second element is silver (Ag); in which palladium (Pd) and silver (Ag) are in a weight ratio of 0.75: 1 to 1: 0.75; or (B) X is 5, Y is 35, the first element is nickel (Ni); (C) X 'is 15, Y' is 50, the second element is copper (Cu); in which nickel (Ni) and copper (Cu) are in a weight ratio of 1: 2 to 1: 3.