The development of 990 gold — titanium: Its production, use and properties

Gafner, G.

doi:10.1007/bf03214709

Cited by 36 publications

(19 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Trials have been undertaken in order to precipitation-harden gold by only one weight percent of titanium. By an appropriate heat treatment, precipitation hardening of this a1 loy occurs; hence its mechanical properties match those of a 9 carat a1 loy while still retaining the hue and bri 1 liance of 999 fine gold [5]. On the other hand, the 990 gold-titanium alloy finds supplementary application in the field of semiconductor interconnections.…”

Section: Au-timentioning

confidence: 97%

Precious-metal-base advanced materials

Nowicki¹,

Carbonnaux²

1993

J. Phys. IV France

View full text Add to dashboard Cite

The precious metals are basically known for their applications in jewelry, coins, bullions and catalysis. The reality is thas precious metals constitute also the base of several advanced materials used in the industry in hundreds of metric tons. Since forties, platinum alloys have been used as structural materials for equipments in the glass industry. The essential reason for this is the excellent resistance of platinum alloys to oxidation and eletrolytical corrosion in molten glasses at temperatures as high as 1200-1500°C. The major drawback is a weak creep resistance. In the case of all conventional platinum alloys, the 100 h creep resistance at 1100°C is smaller than 10 MPa while the stress to cause rupture in 1000 h at 1100°C for superalloys is about 100 MPa. The unique way for significant improvement of platinum base materials acep resistance is a strengthening by an oxide dispersion (ODs). In the cas of CLAL's patented "Plativer" materials, 0.05 wt% of Y2O3 is incorporated within the alloy matrix by the name spraying process. The creep behaviour of such ODs materials shows a 100 times creep rate reduction comparing to conventional platinum alloys. Thanks to the fact that the mean size of oxide particles is included between 2000 and 4000 A, the obtained materials don't exihibit any loss of plasticity in comparison of conventional Pt alloys. Further improvement of platinum base materials is related, in the authors opinion, to the development of precious metals base intermetallics. Anothe interesting applications of precious metals are silver base electrical contacts. They are in fad silver matrix composites containing varying amounts of well-dispersed particles of constituents such as CdO, SnO2, Ni, WC or C. In the case of such materials, particular properties are required and tested : resistance to arc erosion, resistance to welding and contact resistance. Choice of the second phase depends on the specfic service conditions. During last 10 years, an interesting and successful battlle took place in order to replace, without alteration of the properties of conventional materials, toxic CdO by inert SnO2. Electrical contacts are manufactured by various powder metallurgy techniques, including coprecipitation from solution, internal oxidation, internal oxidation of atomized powders, unitary pressing and hot extrusion. A supplementary difficulty comes from the fact that in order to enable brazing or welding of contacts to supports, the parts had to be manufactured as sandwiches : silver composite/pure silver. Many other technically fascinating precious metals base materials exist : brazing alloys for assembling metals, superconductors and ceramics ; dental materials including magnetic biocompatible alloys ; silver composites for superconductor wire jackets. One can ask the fundamental question if the development of materials science will induce the replacement of precious metals by cheaper materials. The observation of current evolution indicate very clearly the opposed tendency : precious metals cannot be replace...

show abstract

Section: Au-timentioning

confidence: 97%

Precious-metal-base advanced materials

Nowicki¹,

Carbonnaux²

1993

J. Phys. IV France

View full text Add to dashboard Cite

show abstract

“…This alloywith a 990 millesimal fineness (i.e. 99.0 % gold) can be endowed with the mechanical properties of a 9 carat alloy while retaining the hue and surface brilliance of 24 carat gold [ 13] . These improved Heat-treatment time, s…”

Section: Fine Wire Of the Au-iwt%ti Alloy Precipitation Strengthenedmentioning

confidence: 99%

A new high strength gold bond wire

Humpston

Jacobson

1992

Gold Bull

View full text Add to dashboard Cite

As semiconductor technology develops, conventional bond wires are reaching the limits of their capability. Industry is demanding finer diameter wire coupled with higher strength, and the retention of this strength at elevated temperatures would be a decided advantage.It has been demonstrated that a fine wire of the composition Au-lwt.%Ti, which was originally formulated for high carat jewellery, can be endowed with these beneficial properties by appropriate thermomechanical treatments. A three-fold increase in the strength of 25 µm diameter wire over that of conventional gold wire has been achieved. The mechanical properties are stable even when the wire is subjected to heating at 400 °C for over a year.Wire based on the Au-1 wt. %Ti alloy can be made comparable to that of the standard gold products in terms of its electrical properties and bonding characteristics. Moreover, it is more resilient to the demands of the fabrication process.

show abstract

“…Estas aleaciones han tenido aplicaciones limitadas por las bajas propiedades mecánicas. No obstante, se han realizado algunas investigaciones para mantener la alta ley de oro, usando como aleante el titanio, el cual permite mejorar las propiedades mecánicas y a su vez conservar el color amarillo característico del oro puro [2][3][4]. En este tipo de aleaciones, una de las alternativas para la fabricación de joyas mas económicas es por medio de láminas delgadas conformadas y unidas por procesos de soldadura blanda, lo cual exige el uso de material de aporte que conserve las características de alta ley del sustrato.…”

Section: Introductionunclassified

Fabricación de la aleación Au-Si para utilización como soldadura blanda de aleaciones de oro

2013

View full text Add to dashboard Cite

ResumenLa Aleación Au-Si en su composición eutéctica presenta un punto de fusión cercano a los 369ºC y color similar al oro de alta ley. En este estudio se presentan resultados de fabricación de las aleaciones de oro con 2,5; 2,8 y 3,0 % de silicio, por Diferencial Scanning Calorimetry ( DSC), the color measure was made by CIELab. The microstructure alloys showed dendritics Au phase and the eutectic constituent were silicon acicular precipitates in the gold matrix. The hardness and microhardness values were near 110 HV, and so, the properties were better than high purity gold alloys. The melting temperature were near the 374°C, also showed a color very similar to the high purity gold alloys.

show abstract

The development of 990 gold — titanium: Its production, use and properties

Cited by 36 publications

References 13 publications

Precious-metal-base advanced materials

Precious-metal-base advanced materials

A new high strength gold bond wire

Fabricación de la aleación Au-Si para utilización como soldadura blanda de aleaciones de oro

Contact Info

Product

Resources

About