Alloys and semi-finished products and products containing same

Abstract

Described includes an alloy consisting of at least 33 wt. % to at most 75.5 wt. % gold, at least 1.5 wt. % to at most 45 wt. % silver, at least 8 wt. % to at most 45 wt. % copper, the remainder being zinc. The invention also relates to a semi-finished product made from such an alloy, a piece of jewelry having at least one such semi-finished product, and a method for producing such a semi-finished product.

1 . A semi-finished product ( 1 ) in the form of a slotted tube, comprising an alloy consisting of:
 33 wt. % to 75.5 wt. % gold,   1.5 wt. % to 45 wt. % silver,   8 wt. % to 45 wt. % copper, and   the remainder being zinc;   wherein the semi-finished product ( 1 ) is formed from a sheet metal ( 3 ) elongated in a first direction, which is shaped in a circular shape; and   wherein the semi-finished product ( 1 ) has a spring constant from 1500 N/m to 2200 N/m.   
     
     
         2 . The semi-finished product ( 1 ) of  claim 1 , wherein the alloy has a copper content from 20.6 wt. % to 42 wt. %. 
     
     
         3 . The semi-finished product ( 1 ) of  claim 1 , wherein the alloy has a silver content from 2.5 wt. % to 10 wt. %. 
     
     
         4 . The semi-finished product ( 1 ) of  claim 1 , wherein the alloy has a copper content from 20.6 wt. % to 27 wt. %. 
     
     
         5 . The semi-finished product ( 1 ) of  claim 1 , wherein the alloy has a silver content from 3.5 wt. % to 10 wt. %. 
     
     
         6 . A piece of jewelry ( 5 ), comprising at least one semi-finished product ( 1 ) of  claim 1 , which is wound at least partially along a longitudinal direction. 
     
     
         7 . The piece of jewelry ( 5 ) of  claim 6 , wherein the piece of jewelry ( 5 ) has at least two semi-finished products ( 1 ) wound parallel to one another along the respective longitudinal direction. 
     
     
         8 . The piece of jewelry ( 5 ) of  claim 6 , wherein the at least one semi-finished product ( 1 ) of the piece of jewelry ( 5 ) is wrapped around its periphery with a noble metal wire ( 7 ). 
     
     
         9 . The piece of jewelry ( 5 ) of  claim 6 , wherein the piece of jewelry ( 5 ) is designed as a bracelet ( 11 ). 
     
     
         10 . A method for producing the semi-finished product ( 1 ) of  claim 1 , comprising:
 providing a sheet metal ( 3 ) elongated in a first direction;   forming the sheet metal ( 3 ) into a slotted tube ( 2 );   curing the slotted tube ( 2 ) at a specific curing temperature of at least 100° C. to at most 400° C. for a specific curing time from at least 2 hours to at most 8 hours, and   receiving the semi-finished product ( 1 ).   
     
     
         11 . The method of  claim 10 , wherein the semi-finished product ( 1 ) is wound up helically along the first direction. 
     
     
         12 . The method of  claim 10 , wherein the semi-finished product ( 1 ) is wrapped around its circumference with a noble metal wire ( 7 ).