C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
C22F 1/14 (2006.01) B23K 35/30 (2006.01) C22C 5/08 (2006.01)
Patent
CA 2567033
A process for making a finished or semi-finished article of silver alloy, said process comprising the steps of providing a silver alloy containing silver in an amount of at least 77 wt%, copper and an amount of germanium that is preferably at least 0.5 wt% and is effective to reduce tarnishing and/or firestain, making or processing the finished or semi-finished article of the alloy by heating at least to an annealing temperature, gradually cooling the article; and reheating the article to effect precipitation hardening thereof. The avoidance of quenching reduces the risk of damage to the article.
La présente invention concerne un procédé pour produire un article fini ou semi-fini à partir d'un alliage d'argent. Ce procédé consiste à disposer d'un alliage d'argent contenant au moins 77 % en poids d'argent, du cuivre et de préférence au moins 0,5 % en poids de germanium, ce qui permet de réduire le ternissement et/ou l'oxydation, à fabriquer ou produire l'article fini ou semi-fini en alliage en chauffant au moins jusqu'à une température de recuit, puis à refroidir progressivement l'article et enfin à réchauffer l'article afin d'impliquer son durcissement par précipitation. L'absence de refroidissement rapide permet de réduire le risque d'endommagement de l'article.
Mcfadden Fincham
Middlesex Silver Co. Limited
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