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18 carat white gold jewellery alloys
Christian P. Susz,Michel H. Linker
Gold Bulletin , 1980, DOI: 10.1007/BF03215124
Abstract: It is usual to distinguish between two types of white gold jewellery alloys according to the metal (nickel or palladium) primarily responsible for the ‘bleaching’ of the colour of the gold. The authors of this article point out that such differentiation is artificial from a metallurgical point of view. They illustrate the practical advantages of considering both nickel and palladium white golds as based on the gold-silver-palladium system.
18 carat yellow gold alloys with increased hardness
Rainer Süss,Elma van der Lingen,Lizelle Glaner,Madeleine du Toit
Gold Bulletin , 2004, DOI: 10.1007/BF03215213
Abstract: An investigation was carried out by Mintek to examine the influence of a range of alloying additions (titanium, vanadium, chromium, molybdenum, cobalt, zirconium, boron, aluminium, silicon, zinc, platinum, palladium, rhodium, iridium and ruthenium) on the formability, hardenability and colour of 18 carat gold alloys. This paper provides chemical formulae for yellow 18 carat gold alloys that have hardnesses which are higher than the hardnesses of the corresponding conventional 18 carat alloys, in particular in excess of 300 HV, but with colours similar to conventional 18 carat gold. A preparation method for the alloys will also be described, which includes the steps of melting, annealing, quenching, cold working and age hardening.
New white gold alloys
I. Bruce MacCormack,John E. Bowers
Gold Bulletin , 1981, DOI: 10.1007/BF03216555
Abstract: Modification of the colour of gold by the addition to it of other metals is important for jewellery applications. The potential of modern equipment for measuring spectral reflectance for the identification of promising new white carat gold compositions is illustrated by this account of a study of the bleaching and other effects of various metals incorporated in 18 carat jewellery alloys containing 10 per cent palladium.
The metallurgy of some carat gold jewellery alloys
Allen S. McDonald,George H. Sistare
Gold Bulletin , 1978, DOI: 10.1007/BF03215089
Abstract: The classification of gold alloys in terms of caratage and colour provides no guidance as to the properties and working characteristics of the many carat gold alloys used in jewellery fabrication. Logical relationships do exist, however, between the composition, metallurgical structure and properties of such alloys, and these emerge from a study of the phase diagrams of the alloy systems involved. Part I of this review deals with coloured gold alloys. Part II will discuss their nickel containing counterparts and will appear in the next issue of Gold Bulletin.
The metallurgy of some carat gold jewellery alloys
Allen S. McDonald,George H. Sistare
Gold Bulletin , 1978, DOI: 10.1007/BF03216534
Abstract: The first part of this article detailed the relationships existing between the composition, metallurgical structure and properties of coloured jewellery gold alloys. In this second part, the same treatment is applied to nickel containing white gold alloys.
Do 18 carat gold solders exist?
G. Humpston,D. M. Jacobson
Gold Bulletin , 1994, DOI: 10.1007/BF03214731
Abstract: However, it may be possible to formulate low melting point 22 carat gold solders. An alternative joining technology, diffusion soldering, is capable of meeting the essential requirements for joining articles of 18 carat gold and its capabilities are described.
Low melting carat gold brazing alloys for jewellery manufacture
G. Zwingmann
Gold Bulletin , 1978, DOI: 10.1007/BF03216526
Abstract: The Au-Ag-Ge-Si system has been investigated as a source of cadmium-free low melting carat gold hard solders but alloys of this type have been found to have restricted applicability. In particular, when applied to copper-containing alloys, brittle copper germanides and silicides are formed.
Precipitation hardening and ordering of carat gold jewellery alloys
Gold Bulletin , 1978, DOI: 10.1007/BF03216531
Abstract: The mechanical properties of gold jewellery alloys are dependant upon their thermal as well as their mechanical histories. An understanding of the mechanisms by which they harden during thermal treatment is therefore important. Two contributions to knowledge in this area are discussed in this note.
A facile chemical screening method for the detection of stress corrosion cracking in 9 carat gold alloys
B. Neumeyer,John Hensler,Anthony P. O’Mullane,Suresh K. Bhargava
Gold Bulletin , 2009, DOI: 10.1007/BF03214936
Abstract: Stress corrosion cracking (SCC) is a well known form of environmental attack in low carat gold jewellery. It is desirable to have a quick, easy and cost effective way to detect SCC in alloys and prevent them from being used and later failing in their application. A facile chemical method to investigate SCC of 9 carat gold alloys is demonstrated. It involves a simple application of tensile stress to a wire sample in a corrosive environment such as 1–10 % FeCl3 which induces failure in less than 5 minutes. In this study three quaternary (Au, Ag, Cu and Zn) 9 carat gold alloy compositions were investigated for their resistance to SCC and the relationship between time to failure and processing conditions is studied. It is envisaged that the use of such a rapid and facile screening procedure at the production stage may readily identify alloy treatments that produce jewellery that will be susceptible to SCC in its lifetime.
White gold alloys:
Steven Henderson,Dippal Manchanda
Gold Bulletin , 2005, DOI: 10.1007/BF03215234
Abstract: This Index provides values that have good correlation with visual assessments and permits easy differentiation of colour without knowledge of an alloys composition. The use of a spectrophotometer instrument provided a quick means of sample colour measurement, with high precision and accuracy.
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