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Scientists from Krasnoyarsk created hypoallergenic jewelry alloy based on palladium

April 05, 2016, 19:03 UTC+3
1 pages in this article

MOSCOW, April 5./TASS/. A group of the scientist-metallurgists of Siberian Federal University under the guidance of professor Nikolai Dovzhenko created a new jewelry alloy based on palladium 850th sample. The inventors obtained a patent from the Federal Service for Intellectual Property (Rospatent).

The new alloy has a lower melting temperature as compared to the other analogs allowing to employ the methods of processing, forming and casting of metals for the production of jewelry.

Scientists have carried this work on demand of the Gulidov Krasnoyarsk Non-Ferrous Metals Plant. This large Russian company produces precious metals on a commercial scale.

«Nowadays, the jewelry market is dominated by jewelry made of palladium alloys fabricated in China", said Dovzhenko. "To enter the European market, our industrial partners need to obtain not only light, plastic, and abrasion-resisting but also hypoallergeniс alloy. These tasks could be hardly accomplished in the same time because the strength of jewelry alloys depends on nickel, which is according to the world health organization might cause allergies."

The new alloy contains 85% palladium, 2% gold, 0.5% rhodium, and silver. The combination of silver and palladium ensures continuous mutual solubility of the components. Gold as a dopant increases the plasticity and corrosion resistance upon casting, reduces the gas absorption affinity. Rhodium acts a modifier contributing to the refinement of the structure. Furthermore, an additional hardening increases corrosion resistance when casting and brightening the color of the alloy.

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