Gold Alloys
Description
The chemical properties of gold make it a unique element in the world. Gold is a precious metal that is opaque and has a very attractive metallic yellow color. It is extremely malleable and is usually found in a relatively pure form. Besides, it is chemically inert so that it will not rust.
Gold is often made into alloys to change its hardness, ductility, melting point, color, and other properties. Copper, zinc, iron, nickel, cadmium, aluminum, silver, platinum and palladium are all common metals alloyed with gold. Most alloys with greater than 50% gold are resistant to tarnish and corrosion. Gold alloys are used in a wide variety of applications. The primary use of gold alloys is in jewelry.
Chemical Compositions and Colors
The purity of gold in the jewelry is indicated by its karat number—24 karat (24K or 24 kt) gold is as pure as gold gets for jewelry. Chemical compositions of colored gold alloys are listed below.
| Color of Gold Alloy | Alloy Composition | Color of Gold Alloy | Alloy Composition |
|---|---|---|---|
| Yellow Gold (22K) | Gold 91.67% Silver 5% Copper 2% Zinc 1.33% | Red Gold (18K) | Gold 75% Copper 25% |
| Rose Gold (18K) | Gold 75% Copper 22.25% Silver 2.75% | Pink Gold (18K) | Gold 75% Copper 20% Silver 5% |
| White Gold (18K) | Gold 75% Platinum or Palladium 25% | White Gold (18K) | Gold 75% Palladium 10% Nickel 10% Zinc 5% |
| Gray-White Gold (18K) | Gold 75% Iron 17% Copper 8% | Soft Green Gold (18K) | Gold 75% Silver 25% |
| Light Green Gold (18K) | Gold 75% Copper 23% Cadmium 2% | Green Gold (18K) | Gold 75% Silver 20% Copper 5% |
| Deep Green Gold (18K) | Gold 75% Silver 15% Copper 6% Cadmium 4% | Blue-White or Blue Gold (18K) | Gold 75% Iron 25% |
| Purple Gold | Gold 80% Aluminum 20% |
Gold Alloy Products
- Gold-Palladium Alloys
- Gold-Nickel Alloys
- Gold-Iron Alloys
- Gold-Silver Alloys
- Gold-Germanium Alloys
- Gold-Tin Alloys
- Gold-Antimony Alloys
- Gold-Palladium Alloys
Gold (Au) and palladium (Pd) are totally soluble in one another. Gold-Palladium alloys were developed to address limitations associated with the silver-containing alloys. The composition of Gold-Palladium alloys ranges from 44% to 55% gold and from 35% to 45% palladium.
Alfa Chemistry provides high-quality Gold-Palladium alloys in the shapes of wire, foil, tube, etc. We can also customize various shapes of Gold-Palladium products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Wire | ACAM-PRE-A001 | Au93Pd7 | Diameter: 0.5mm Length: 0.025m - 10m |
| Foil | ACAM-PRE-A002 | Au75Pd25 | Thickness: 0.2mm Size Light Tight: 10mm x 10mm - 100mm x 100mm |
| Tube | ACAM-PRE-A003 | Au75Pd25 | Outside Diameter: 2mm, 3mm Inside Diameter: 1.7mm, 2.7mm Length: 25mm - 1000mm |
| Sputtering Target Disc | ACAM-PRE-A004 | Au80Pd20 | Thickness: 0.1mm, 0.2mm Diameter: 50mm - 57mm |
- Gold-Germanium Alloys
Gold-Germanium (Au-Ge) alloy is a binary low-temperature brazing alloy with germanium added to the gold base. Gold-Germanium alloy is brittle, it is difficult to process into material. After annealing at 200 ℃ for several minutes, its plasticity can be significantly improved.
Alfa Chemistry provides high-quality Gold-Germanium alloys in the shapes of wire, foil, pellet, etc. We can also customize various shapes of Gold-Germanium products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Wire | ACAM-PRE-A005 | Au99.5Ge0.5 | Diameter: 1mm Length: 0.025m - 4m |
| Eutectic Foil | ACAM-PRE-A006 | Au88Ge12 | Thickness: 0.025mm Size Light Tight: 25 mm x 25 mm - 50 mm x 100 mm |
| Eutectic Foil | ACAM-PRE-A007 | Au88Ge12 | Thickness: 0.025mm Coil Width: 1mm |
| Eutectic Pellet | ACAM-PRE-A008 | Au88Ge12 | Maximum Lump Size: 10mm |
- Gold-Nickel Alloys
Gold-Nickel (Au-Ni) alloy is a binary alloy with nickel added to the gold base. It is a continuous solid solution above 850℃, which is decomposed into two phase solid solutions rich in gold and nickel at low temperature.
Alfa Chemistry provides high-quality Gold-Nickel alloys in the shapes of wire and foil. We can also customize various shapes of Gold-Nickel products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Foil | ACAM-PRE-A009 | Au82Ni18 | Thickness: 0.05mm, 0.25mm Size Light Tight: 10mm x 10mm - 100mm x 100mm |
| Wire | ACAM-PRE-A010 | Au82Ni18 | Diameter: 0.025-1mm Length: 0.05-100m |
- Gold-Tin Alloys
The Gold-Tin (Au-Sn) alloy has a high melting point (280℃), which is greater than the typical lead-free solder, and is superior in terms of its high thermal conductivity and post-bonding reliability. It can be used for a variety of applications.
Alfa Chemistry provides high-quality Gold-Tin alloys in the shapes of foil, wire, rod, etc. We can also customize various shapes of Gold-Tin products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Foil | ACAM-PRE-A011 | Au80Sn20 | Thickness: 0.025mm, 0.05mm, 0.1mm Size Light Tight: 50mm x 50mm |
| Wire | ACAM-PRE-A012 | Au80Sn20 | Diameter: 0.125mm, 0.25mm, 0.5mm, 1mm Length: 0.05m - 25m |
| Rod | ACAM-PRE-A013 | Au80Sn20 | Diameter: 3mm Length: 25 mm - 50 mm |
- Gold-Iron Alloys
In addition to being alloyed with precious metals such as silver and palladium, gold can also be alloyed with iron (Fe) which shows power of magnetic attraction.
Alfa Chemistry provides high-quality Gold-Iron alloys in the shapes of wire. We can also customize various shapes of Gold-Iron products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Wire | ACAM-PRE-A014 | Au99.93Fe0.07 | Diameter: 0.025mm, 0.05mm Length: 0.05m - 50m |
| Insulated Wire | ACAM-PRE-A015 | Au99.93Fe0.07 | Conductor Diameter: 0.1mm Insulation: PTFE (Polytetrafluoroethylene) Insulation Thickness: 0.01mm Length: 0.1m - 2m |
- Gold-Antimony Alloys
In addition to being alloyed with precious metals such as silver and palladium, gold can also be alloyed with antimony (Sb).
Alfa Chemistry provides high-quality Gold-Antimony alloys in the shapes of wire. We can also customize various shapes of Gold-Antimony products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Wire | ACAM-PRE-A016 | Au99Sb1 | Diameter: 0.5mm, 1mm Length: 0.025m - 3m |
- Gold-Silver Alloys
Gold (Au) and silver (Ag) can be dissolved in any ratio, so it can form various components of the gold and silver alloy.
Alfa Chemistry provides high-quality Gold-Silver alloys in the shapes of rod. We can also customize various shapes of Gold-Silver products according to your requirements or drawings.
| Shape | Catalog | Composition | Size |
|---|---|---|---|
| Rod | ACAM-PRE-A017 | Au50Ag50 | Diameter: 3mm Length: 10mm - 210mm |
Applications
The demand for gold alloys is increasing year by year, and there is a very wide range of applications in industry and people's daily life, mainly including the following aspects:
- In addition to its own financial value, gold alloys also have a beautiful appearance, good resistance to corrosion and obscurity making them an extraordinary jewelry manufacturing material.
- Gold alloy brazing material has excellent brazing process performance and brazing joint properties. It is widely used in the brazing of some important components in the aerospace, aviation and electronics industries.
- Gold alloy can be used as electrical contact material applied in weak current, low power contact material.
- Gold alloy can be used in dentistry for crowns and bridges, and other medical domains.
- Other functional materials like shape memory alloy.