Metallurgy and processing of coloured gold intermetallics — Part II: Investment casting and related alloy design

Fischer‐Bühner, Jörg; Basso, Andrea; Poliero, Massimo

doi:10.1007/bf03214962

Cited by 19 publications

(14 citation statements)

References 8 publications

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“…In contrast, microstructural evidence from other C1 systems suggests an equilibrium state of mutual immiscibility for compounds of this type. For example, the compounds AuIn 2 and PtIn 2 [5] and AuAl 2 , AuIn 2 and AuGa 2 [6] are reported to be mutually insoluble.…”

Section: Introductionmentioning

confidence: 99%

Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis

et al. 2015

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The intermetallic compounds AuAl 2 and PtAl 2 are colored purple and yellow respectively. In the past they have been prepared by bulk melting techniques or by co-deposition in a magnetron sputterer. Here, however, we investigate films of AuAl 2 , PtAl 2 and (Au,Pt)Al 2 prepared by sequential physical vapor deposition of the elements, followed by in situ solid-state reaction. The microstructure, dielectric functions, optical properties and thermal stability of the resulting films are characterized and compared to those prepared by bulk melting or co-deposition. The (Au,Pt)Al 2 films show a color gamut that stretches from purple to brassy yellow depending on composition and microstructure. High temperature synchrotron X-ray diffraction experiments show that the (Au,Pt)Al 2 phase is metastable, decomposing when heated above 420 °C. In contrast, the pure AuAl 2 or PtAl 2 phases are stable to about 580 °C before they oxidize or decompose. The alternative possibility of producing the purple-to-yellow color gamut by depositing optical stacks of very thin films of AuAl 2 and PtAl 2 is also assessed. Either scheme will provide a range of colors lying between those of the binary compound endpoints. Calculations predict that deposition of AuAl 2 onto PtAl 2 will produce more intense colors than vice versa, an unexpected finding that is worth further investigation.

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Section: Introductionmentioning

confidence: 99%

Thin films of PtAl2 and AuAl2 by solid-state reactive synthesis

et al. 2015

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“…They are characterized by thicknesses less than 0.2 µm and precious metal concentrations lower than one gram per liter. There are yellow [90], light and white [91], pink [92], and blue [93] golds. Moreover, the so-called black golds, containing Co and Ru in the alloy, are also on the market [94].…”

Section: Goldmentioning

confidence: 99%

Electroplating for Decorative Applications: Recent Trends in Research and Development

et al. 2018

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Electroplating processes are widely employed in industrial environments for a large variety of metallic coatings, ranging from technological to decorative applications. Even if the galvanic electrodeposition is certainly a mature technology, new concepts, novel applications, environmental legislation and the new material requirements for next-generation devices make the scientific research in this field still very active. This review focuses mostly at the decorative and wearable applications, and aims to create a bridge between the past knowledge and the future direction that this process, i.e., electrodeposition, is taking. Both the theoretical fundamentals as well as some of the most widespread practical applications-limited to metallic and alloy coatings-are explored. As an integral part of the industrial process, we take a look at the main techniques thought which the quality control of deposits and surfaces is carried out. Finally, global industrial performance and research directions towards sustainable solutions are highlighted.

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“…The present study has also the task to find out the possibility to obtain unstressed (without cracks) coatings with pinkish-purple color. The establishment of wellfunctioning non-toxic electrolytes for colored tarnish resistive alloys of non-noble metals is a challenge in the modern electroplating [11,12]. Aim of the present study was to establish the conditions of the electrolysis for the preparation of structured and unstressed purple-pink coatings on the alloy Cu-Sb, including their phase characterization.…”

Section: Introductionmentioning

confidence: 99%