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Volume 67, Issue 3
  • ISSN: 2056-5135
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  • oa Study on Technical Parameters and Suitability of Platinum-Based Metallic Glasses for Jewellery Applications

    Testing a series of platinum-based alloys for novel designs

  • Authors: L.-Y. Schmitt1, N. Neuber2, M. Eisenbart1, L. Ciftci2, O. Gross3, U. E. Klotz1 and R. Busch2
  • Affiliations: 1 Research Institute for Precious Metals and Metal Chemistry (fem)Katharinenstrasse 17, 73525 Schwäbisch GmündGermany 2 Saarland UniversityCampus C6.3, 66123 SaarbrückenGermany 3 Amorphous Metal SolutionsMichelinstraße 9, 66424 HomburgGermany
  • Source: Johnson Matthey Technology Review, Volume 67, Issue 3, Jul 2023, p. 317 - 332
  • DOI: https://doi.org/10.1595/205651323X16577027080875
    • Received: 21 Mar 2022
    • Accepted: 05 Jul 2022
    • Published online: 13 Jul 2022

Abstract

Jewellery-specific standardised tests as well as bulk metallic glass (BMG)-specific testing methods were performed on a series of platinum-based BMGs with and without phosphorus, to evaluate their suitability as jewellery items. Their mechanical properties (elasticity, Young’s modulus and yield stress) were determined by three-point beam bending measurements. Hardness, wear and corrosion resistance were tested in comparison to state-of-the-art crystalline platinum-based jewellery alloys. The platinum-BMG alloys exhibit elastic elongation of about 2%. Compared to conventional crystalline platinum-alloys, their fracture strength of . 2 GPa and their hardness of . 450 HV1 is four and two times higher, respectively. However, the BMGs show less abrasion resistance in the pin-on-disc test than the conventional benchmark alloys due to adhesive wear and microcracking. Regarding the corrosion resistance in simulated body fluids, the BMG alloys reveal a slightly higher release of metals, while the tarnishing behaviour is comparable to the benchmark alloys. The phosphorus-free platinum-BMG alloy showed pronounced tarnishing during exposure to air at elevated temperature. The outstanding thermoplastic formability, a special feature of amorphous metals that can be crucial for enabling novel and filigree designs, was determined and quantified for all BMG alloys.

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2022-07-13
2024-12-26
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/content/journals/10.1595/205651323X16577027080875
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Study on Technical Parameters and Suitability of Platinum-Based Metallic Glasses for Jewellery Applications
Johnson Matthey Technology Review 67, 317 (2023); https://doi.org/10.1595/205651323X16577027080875
/content/journals/10.1595/205651323X16577027080875
/content/journals/10.1595/205651323X16577027080875
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  • Article Type: Research Article

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