Platinum Alloy and Method of Production Thereof

Abstract

The disclosure relates to a platinum alloy comprising (a) 55 to 63 wt. % of platinum, (b) 2 to 10 wt. % of cobalt, and (c) 27 to 43 wt. % of copper. The disclosure further relates to a platinum alloy comprising (a) 70 to 79.5 wt. % of platinum, 2 to 10 wt. % of cobalt, and (c) 10.5 to 28 wt. % of copper. The platinum alloys have excellent mechanical and optical properties for use in the production of ornamental articles such as rings, necklaces, earrings, watch bands, watch bodies and other jewelry. The disclosure further relates to a method of preparing the platinum alloys and their use in the production of ornamental articles. Still further the disclosure relates to ornamental articles comprising the platinum alloy and a method of production thereof.

1 . A platinum alloy comprising:
 55 to 63 wt. % of platinum,   2 to 10 wt. % of cobalt, and   27 to 43 wt. % of copper.   
   
   
       2 . A platinum alloy comprising:
 70 to 79.5 wt. % of platinum,   2 to 10 wt. % of cobalt, and   10.5 to 28 wt. % of copper.   
   
   
       3 . The platinum alloy according to  claim 2 , wherein said alloy comprises 72 to 78 wt. % of platinum. 
   
   
       4 . The platinum alloy according to  claim 2 , wherein said alloy comprises 74 to 76 wt. % of platinum. 
   
   
       5 . The platinum alloy according to  claim 1 , wherein a Vickers hardness of said alloy, measured at soft sate, is between about 130 to 210 HV10. 
   
   
       6 . A method of preparing a platinum alloy, comprising the steps of:
 providing alloy components, said alloy components comprising: 55 to 63 wt. % of platinum, 2 to 10 wt. % of cobalt, and 27 to 43 wt. % of copper;   blending the components of the alloy; and,   melting the alloy.   
   
   
       7 . The method according to  claim 6 , comprising the further step of casting the melted alloy into a shape of the ornamental article. 
   
   
       8 . Use of the platinum alloy according to  claim 1  for manufacturing an ornamental article selected from the group consisting of a ring, a necklace, an earring, a watch band, and a watch body. 
   
   
       9 . The platinum alloy according to  claim 2 , wherein said alloy comprises 2.0 to 8.0 wt. % of cobalt. 
   
   
       10 . The platinum alloy according to  claim 2 , wherein said alloy comprises 3.5 to 5.5 wt. % of cobalt. 
   
   
       11 . The platinum alloy according to  claim 2 , wherein said alloy further comprises 0.001 to 2 wt. % of at least one first metal selected from the group consisting of palladium, iridium and ruthenium. 
   
   
       12 . The platinum alloy according to  claim 2 , wherein said alloy further comprises a 0.001 to 2 wt. % of at least one second metal selected from the group consisting of indium and gallium. 
   
   
       13 . The platinum alloy according to  claim 2 , wherein a Vickers hardness of said alloy, measured at soft state, is between about 130 to 210 HV10. 
   
   
       14 . The platinum alloy according to  claim 2 , wherein an elongation at break of said alloy is at least 20%. 
   
   
       15 . The platinum alloy according to  claim 2 , wherein a color tone of said alloy corresponds essentially to a platinum white color tone of a PtCu950 alloy. 
   
   
       16 . Use of the platinum alloy according to  claim 2  for manufacturing an ornamental article selected from the group consisting of a ring, a necklace, an earring, a watch band, and a watch body.