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https://www.stuller.com/articles/view/why-use-platinum-cobalt-alloy/
Jul 28, 2021 · For example, this Pt-Co alloy was developed more than 20 years ago and has been used extensively in Europe and Japan for jewelry. It’s not new, and it was developed specifically to perform better in jewelry casting than either Platinum-Iridium (Pt-Ir) or Platinum-Ruthenium (Pt-Ru).
https://www.ganoksin.com/article/platinum-alloy-applications-for-jewelry/
Platinum Cobalt is being used in the U.S. Germany, Europe and Hong Kong. Ganoksin is sponsored by. Pt/Co 950 Pt/Co 955 in Europe. ... While there is palladium jewelry and findings being made, the main use for palladium in the jewelry industry is as an alloy with platinum. Adding palladium to platinum will add some hardness.
https://www.techformcasting.com/platinum-jewelry-casting-house/jewelry-alloys/
110. Platinum 95% Cobalt 5%. This is an excellent casting alloy that has higher as-cast density than other mainstream jewelry alloys. Unlike PtRu and PtIr, it will oxidize when exposed to high temperatures and it is slightly magnetic, therefore bench jeweler techniques must take …Estimated Reading Time: 4 mins
https://www.bluenile.com/education/metal/cobalt
Made from a highly durable alloy, cobalt is four times harder than platinum while at the same time, less dense. Because of its natural hardness, cobalt jewelry is extremely scratch, chip and corrosion-resistant. Its lower density and natural malleability allow for strong, dynamic designs with less weight.
http://www.capepreciousmetals.com/wp-content/uploads/2018/01/guide_to_Pt_alloys.pdf
Platinum/Cobalt Systems Cobalt is a white metal with reddish tints. Brittle and hard, it melts at 1,490°C and is generally used as an alloying metal for copper, iron, and platinum. Combined with platinum, cobalt acts as a grain refiner and is used solely for casting. Platinum 950/cobalt 50 is one of the most superior casting alloys on the
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