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Volume 62, Issue 4
  • ISSN: 2056-5135
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  • oa Optimisation of a Jewellery Platinum Alloy for Precision Casting: Evaluation of Mechanical, Microstructural and Optical Properties

    Two new platinum alloys proposed for jewellery use

  • Authors: Tanja Trosch1, Fanny Lalire2, Stéphane Pommier2, Rainer Völkl1 and Uwe Glatzel1
  • Affiliations: 1 University BayreuthMetals and Alloys, Ludwig-Thoma-Str. 36b, 95447 BayreuthGermany 2 VV, Branch of Richemont International SARue St-Georges 7, 2800 DelémontSwitzerland
  • Source: Johnson Matthey Technology Review, Volume 62, Issue 4, Oct 2018, p. 364 - 382
  • DOI: https://doi.org/10.1595/205651318X696837
    • Published online: 01 Jan 2018

Abstract

An optimal platinum alloy for precision casting was developed by taking 25 possible alloying elements into consideration. In order to rank these elements an equation was designed. The ranking allowed five promising alloy compositions to be identified. From these five alloys arc melted buttons were produced and tested for homogeneity and hardness to ensure their suitability as jewellery alloys. A pyrometer was used to measure solidus temperatures. In a second iteration, the five alloys were further improved and the most promising alloys were cast and compared to a commonly used jewellery alloy: platinum-copper-gallium (PtCuGa). The comparison was based on the melting interval and on microstructural investigations, carried out by scanning electron and optical microscopy, while mechanical properties were determined by tensile testing. Additionally, optical properties such as reflectivity and colour were investigated. After the second iteration two very promising compositions were identified: PtCuFeMnCr and PtCuFePdVY.

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2018-01-01
2024-12-26
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/content/journals/10.1595/205651318X696837
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Optimisation of a Jewellery Platinum Alloy for Precision Casting: Evaluation of Mechanical, Microstructural and Optical Properties
Johnson Matthey Technology Review 62, 364 (2018); https://doi.org/10.1595/205651318X696837
/content/journals/10.1595/205651318X696837
/content/journals/10.1595/205651318X696837
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  • Article Type: Research Article

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