Developing Ag-9Pd (Silvadium) Casting Alloys with High-Luminosity Lifespan ‎for Traditional Jewelry‎

Document Type : Original Research Article

Author

B.Sc., CEO of Rahimi Art Gallery, Tehran, Iran. ‎

10.22034/frj.2020.237749.1121

Abstract

In this study, Ag-9Pd alloy is introduced as a suitable alloy with a high luminosity for the ring production process. Initially, due to the high price of it, the amount of palladium required to achieve 100 grams of Ag-9Pd (Silvadium) alloy was calculated by the HSC Chemistry 5 software. In order to verify the calculations results, the alloy developed by coagulation casting and rapid solidification was assessed by ICP. As a result, the evaluation indicated great calculations precision. Also, the microstructure, hardness, and luminosity of the produced alloy were compared with both pure silver and Ag-4Pd alloy. The results of microscopic images depicted that Ag-9Pd alloy had smaller dendritic spaces, more homogeneous structures, as well as no defects. Raising the volume fraction of zinc-enriched PdCu and nickel-based precipitates increased the hardness based on the Orvan mechanism. Therefore, as the amount of Pd rises, the luminosity and luminosity life span of the alloy increased due to the improvement in oxidation resistance.

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Main Subjects

References

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Founding Research Journal
Volume 4, Issue 2 - Serial Number 13
September 2020
Pages 111-118

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History

  • Receive Date: 02 July 2020
  • Revise Date: 12 August 2020
  • Accept Date: 16 August 2020

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