Development of novel 18-karat, premium-white gold bulk metallic glasses with improved tarnishing resistance
| Autor: | Ralf Busch, Lisa-Y. Schmitt, Ulrich E. Klotz, Miriam Eisenbart, Isabella Gallino, Nico Neuber, Oliver Gross, Lamia Ciftci |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Materials science
Alloy 02 engineering and technology Liquidus engineering.material 01 natural sciences law.invention Corrosion law Phase (matter) 0103 physical sciences lcsh:TA401-492 General Materials Science Crystallization Internal oxidation 010302 applied physics Amorphous metal Mechanical Engineering 021001 nanoscience & nanotechnology Chemical engineering Mechanics of Materials engineering lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Glass transition |
| Zdroj: | Materials & Design, Vol 140, Iss, Pp 495-504 (2018) |
| DOI: | 10.22028/d291-39662 |
| Popis: | The 18kt gold-based bulk glass-forming composition Au49Ag5.5Pd2.3Cu26.9Si16.3 is modified in order to reduce its fast surface tarnishing caused by internal oxidation of Si, partitioning and fast out-diffusion of Cu and Au. By partially substituting Cu by the species Ga or Sn, the formation of Si as primary crystalline phase is facilitated and a distinct increase of the liquidus temperature is observed. It is found that a reduction of the Si content recovers the glass-forming ability of the novel Ga/Sn-containing alloys, reflected by an increasing reduced glass transition temperature, Trg, and a decreasing driving force for crystallization. This strategy is used to reduce the amount of Cu and Si, which are responsible for the fast surface tarnishing. Corrosion studies of the novel alloys reveal that the Cu release into an artificial saliva test solution is up to eight times lower than that of the mother alloy and the corrosion depth in artificial saliva is drastically lowered by 50% for the Ga-bearing alloys and by 80% for the Sn-bearing alloys. Keywords: Bulk metallic glass, Gold, Corrosion, Alloy development, Jewelry application |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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