Silver alloy is a high-tech material with excellent properties, widely used in electronics, electrical and high-end industrial fields. Its main characteristics include excellent electrical conductivity and thermal conductivity, which makes silver alloy excel in electrical contact and heat conduction. Silver alloy combines the excellent electrical conductivity of silver with the advantages of other metals, such as improved wear resistance and corrosion resistance, so that it can maintain stable performance in extreme environments.
1. Pure silver, fine-grained silver contacts, contacts, rivets, contacts
Pure silver contacts Pure silver has the highest electrical conductivity, thermal conductivity, plasticity and arc corrosion resistance, and has very low contact resistance. It is easy to process and weld, so it is an ideal contact material (electrical connection material) for making continuous closed electrical connectors. It is one of the most commonly used materials in small-capacity low-voltage electrical appliances. For example, automatic switches, thermostats, baking machines, ovens, timers, thermal relays, computers, etc. Fine-grained silver is made by adding trace elements to silver to refine the grains. Therefore, it has similar electrical conductivity and thermal conductivity as silver and stable contact resistance, and has better strength and hardness than silver, and its electrical life is higher than that of pure silver.
2. Silver/Copper Composite Contact Ag/Cu
Silver-copper has high hardness and good wear resistance, and is mainly used in electrical appliances with sliding friction when the contacts are opened and closed.
The contact has good conductivity and is not easy to oxidize on the surface. When copper (3-28%) is added, the silver's resistance to burning can be significantly improved. Therefore, the contact material doped with copper can be used for current intensity up to 16A. Because the addition of copper, especially when the copper content is high (such as 10%), can reduce the material transfer phenomenon under DC working conditions. It is widely used in the entire field of electrical switches, such as AC contactors, relays, power tool switches, buttons, timers, household appliances, etc.
3. Silver-nickel/copper composite contacts AgNi5/Cu, AgNi10/Cu, AgNi15/Cu, AgNi20/Cu
Silver-nickel electrical contacts have good electrical conductivity. They have small and stable contact resistance, small material transfer under DC current, good wear resistance, and are non-toxic. Silver-nickel 10 is manufactured by coprecipitation powder sintering and extrusion, and silver-nickel 20 and silver-nickel 30 are manufactured by powder sintering and extrusion. This contact is widely used in AC switches as electrical contacts in low-voltage technology. Its advantage is that it can be welded to the contact bridge without an additional solderable layer, so that the preparation process of the contact parts can be simple and economical. Such as relay command switches, cam switches, auxiliary contactors, instrument switches, thermostat washing machine timers, automatic switches, relays, automotive electrical switches, etc.
Silver alloy made by adding nickel to silver. Adding a small amount of nickel can refine the grains, improve the hardness, wear resistance and burning resistance of silver, and slightly increase the contact resistance. Since silver and nickel are not miscible, they are prepared by powder metallurgy, and the nickel content is generally 5% to 40%. Silver-nickel alloy electrical contact materials have good electrical and thermal conductivity, strong resistance to metal transfer, arc burnout, electrical erosion, good wear resistance, high strength, good ductility and cutting ability, and higher contact resistance than silver. The physical properties of silver-nickel alloy are shown in the table. In the past, the preparation of silver-nickel alloys mostly used chemical co-deposition to obtain silver and nickel mixed powders, and then used chemical methods to make silver and nickel coated powders. Chemical powder making generally has a more complicated process and high cost. With the development of powder making technology, in recent years, mechanical atomization has been used to make extremely fine powders, and then mixed, pressed, sintered, and extruded to make silver-nickel alloys with equally reliable performance. Recently, silver and nickel co-spraying powder making and mechanical alloying technology have been developed, and the material performance is better. A small amount of rare earth elements can be added to silver-nickel alloys to improve their performance. Silver-nickel alloys are mostly used in low-voltage electrical appliances. AgNi10 is mostly used in AC contactors below 20A; AgNi (15-40) can withstand greater loads. Silver-nickel alloy is widely used as a contact material in various switches, controllers, voltage regulators, circuit breakers, automotive electrical appliances, magnetic starters, etc.
4. Silver cadmium oxide/copper composite contact AgCdO10/Cu, AgCdO12/Cu, AgCdO15/Cu
Silver cadmium has good conductivity and certain arc extinguishing ability. Silver cadmium alloy contacts are often used in contact electrical appliances of automobile horns and some instruments and meters. Silver cadmium oxide is resistant to electrical wear and welding, and has low and stable contact resistance. In silver cadmium oxide, cadmium oxide is dispersed in the silver matrix, thereby increasing the hardness and wear resistance of the material. When the dispersed cadmium oxide particles decompose under the action of the arc, they absorb a lot of heat, which is conducive to cooling and extinguishing the arc. During decomposition, violent evaporation occurs to blow away the arc, purifying the contact surface, thereby reducing electrical wear, increasing electrical life and maintaining low contact resistance. Silver cadmium oxide wire is manufactured by pre-oxidation method; silver cadmium oxide contact pieces are added with trace elements (T) and manufactured by alloy internal oxidation method, and their brazing surface has a composite silver layer.
This contact is one of the most important materials in silver-metal oxide contact materials. The special properties of the contact are determined by the fine CdO in the silver lattice. When the temperature is higher than 900℃, CdO sublimates, cooling the contact surface, reducing arc energy and arc extinguishing, while the presence of cadmium oxide improves the contact's welding resistance. Typical application range: low-voltage contactors, relays, automatic switch flasher relays, auxiliary switch series, timers, starters, circuit breakers and leakage protection switches, such as CJ10, CJ20 series, S060 small switches and TH series circuit breakers.
5. Silver zinc oxide/silver tin oxide AgZnO/AgSnO
Silver tin oxide is made of powder by special process and has excellent arc erosion resistance, wear resistance and welding resistance. It is an ideal environmentally friendly electrical contact material to replace silver cadmium oxide and has been gradually applied in AC and DC contactors, relays and low-voltage circuit breakers. The oxide of this contact has higher thermal stability than CdO. For AgZnO contact material, because ZnO has higher stability, the contact resistance increases, but it can be compensated by structural means. For example, a higher contact force can be used.
In AgSnO material, due to the presence of a trace amount of special metal oxide additives, its contact resistance is guaranteed to be within the allowable range. When disconnected, the performance of the contact is determined by burning, arcing and arc extinction. In this regard, the characteristics of silver-metal oxide contact materials are mainly in the burning resistance. AgCdO contact materials produced by powder metallurgy are more resistant to burning and arcing than those prepared by internal oxidation. Under high load conditions, AgSnO material has lower material loss than AgCdO. AgCdO13 contact material also exhibits similar performance. AgZnO material is most suitable for contactors and air switches with large switching capacity. Such as DZ5, DZ12, DZ13 and DZ15 series circuit breakers, TCK7 DC contactors and leakage switches. AgSnO2 contact material is environmentally friendly and non-toxic, with excellent resistance to welding and arc erosion. Generally speaking, under conditions of large current, AgSnO2 has better arc erosion resistance than AgCdO; under lamps or capacitive loads, AgSnO2 exhibits stronger resistance to current shock than AgCdO and AgNi; under AC resistive loads, AgSnO2 has a slightly higher contact resistance than AgCdO, but under DC lamps or motor loads, it exhibits low and stable contact resistance; under DC conditions, AgSnO2 material transfers less than AgCdO. AgSnO2 contact materials are widely used in medium and large capacity AC and DC contactors, AC and DC power relays, automotive electrical appliances and small and medium capacity low voltage circuit breakers.
6. Silver tin oxide indium oxide contacts, contacts, rivets AgSnO2In2O3
Silver tin oxide indium oxide (AgSnO2ln203) is currently the most commercially valuable alternative to silver cadmium oxide (AgCdO). Because it has better stability and higher hardness than silver cadmium oxide, it has better resistance to welding and burning. In particular, the needle-shaped oxides precipitated during the internal oxidation process are oriented perpendicular to the contact surface, which is very beneficial to the performance of the contact. This material replaces AgCdO materials and is used in low-voltage electrical appliances such as circuit breakers, switches, relays, etc.
our Products
Our Solid Silver Contacts are made of high-purity silver material, combining excellent conductivity and wear resistance to ensure that every contact can transmit stable and efficient current, significantly reducing energy loss and contact resistance. Each silver contact is precisely processed and strictly quality controlled, with excellent corrosion resistance and long-term durability, and can maintain stable performance even under high loads and extreme environments. This not only improves the overall performance of the equipment, but also extends its service life and reduces maintenance and replacement costs. Whether used in industrial equipment or high-end electronic products, our silver contacts can provide unparalleled reliability and efficiency. Choosing our silver contacts, you will experience higher work efficiency and lasting product quality. Contact us now for more product details and let us help you improve the performance and reliability of your equipment!
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