01. Sterling silver contacts, contacts, rivets Ag
Pure silver and fine-grained silver have high electrical conductivity and thermal conductivity, low and stable contact resistance, good welding and processing performance, and crystalline silver greatly refines the grain structure of the material due to the addition of a small amount of nickel Under almost the same resistance conditions, its mechanical strength and temperature resistance are higher than silver. Has the highest electrical conductivity and thermal conductivity, and has very low contact resistance, easy to process and easy to weld. It is one of the most commonly used materials in low-capacity low-voltage electrical appliances. For example, automatic control switch, thermal relay timer, regulator, thermostat, baking machine, oven timer, computer, etc.
02. Silver nickel contacts, contacts, rivets AgNi (10-20)
Uses: Used in low-voltage switching devices such as thermostats, protection switches, small current contactors, automatic switches, precision instruments, relays, etc.
Features: good electrical and thermal conductivity, low and stable contact resistance, small and uniform electrical loss, and less planar material migration when applied under DC conditions. When the material is turned on and off, the contact resistance is increased due to the formation of oxides, it is sensitive to sulfur, and the anti-fusion resistance is poor under high current. Often used with graphite. By adopting powder sintering and extrusion technology, the performance of electrical contacts can be improved. Adding a small amount of graphite to nickel can get better performance composite materials.
03. Silver cadmium oxide contacts, contacts, rivets AgCdO (10-20)
Uses: used in various contactors, plastic case air switches, leakage switches, DC fast switches, cam switches, automotive contactors, automotive protection switches, indoor thermostats, micro switches and large-capacity relays, and various switches for the aviation industry .
Features: Good electrical wear resistance, welding resistance and thermal conductivity, small and stable contact resistance; since cadmium oxide is dispersed in the dispersed phase, it can increase the hardness of the material and improve the mechanical wear resistance; silver cadmium oxide electrical contacts Strong resistance to welding when passing short-circuit current. The electrical contact manufacturing process has a great influence on its performance. The electrical contacts manufactured by the powder metallurgy process have good resistance to fusion welding, but the corrosion resistance is poor, and the electrical contacts manufactured by the alloy internal oxidation method have good electrical resistance. However, the resistance to fusion welding is slightly lower. The powder sintering and extrusion process developed in recent years has improved the distribution of cadmium oxide in the silver matrix, which has improved the overall performance of the electrical contacts.
04. Silver tin oxide contacts, contacts, rivets AgZnO (8-10)
Uses: Used in relays, contactors, air switches, current limit switches, motor protectors, micro switches, instruments, household appliances, automotive appliances (light switches, load switches such as starter motors), leakage protection switches, etc.
Characteristics: Compared with silver cadmium oxide, silver tin oxide does not contain toxic metal cadmium. The metal oxides have high thermal stability, good electrical and thermal conductivity, high heat resistance, arc corrosion resistance and Anti-fusion welding, thus ensuring the reliability of electrical appliances and increasing the service life. Moreover, silver tin oxide has developed rapidly. Even in some electrical switches, silver tin oxide can be directly used to replace silver cadmium oxide without major changes. The use range is from 10A to 1000A, which is close to or even better than silver cadmium oxide in many performances.
05. Silver zinc oxide contacts, contacts, rivets AgSnO2
AgSnO2 contact materials are environmentally friendly and non-toxic, with excellent resistance to fusion welding and arc erosion resistance. Generally speaking, under the condition of large current, AgSnO2 has better resistance to arc erosion than AgCdO; under lamp or capacitive load, AgSnO2 shows stronger resistance to current impact than AgCdO and AgNi; Under sexual load, the contact resistance of AgSnO2 is slightly higher than that of AgCdO, but under DC lamp or motor load, it shows low and stable contact resistance; under DC conditions, AgSnO2 material transfer is less than that of AgCdO. AgSnO2 contact materials are widely used in medium and large capacity AC and DC contactors, AC and DC power relays, automotive appliances and small and medium capacity low voltage circuit breakers. The AgSnO2 contact material currently produced by Guilin Jinge Company has a SnO2 content of 8% to 15%. The main production processes include atomization sintering extrusion (ASE), mixed powder sintering extrusion (MSE) and internal oxidation extrusion (IOE) , The form of supply is mainly wire, sheet, rivets and welding components.
Uses: Used in relays, contactors, air switches, current limit switches, motor protectors, micro switches, instruments, household appliances, automotive appliances (light switches, load switches such as starter motors), leakage protection switches, etc.
Characteristics: Compared with silver cadmium oxide, silver zinc oxide does not contain toxic metal cadmium and will not pollute the environment. Among them, the metal oxide has high thermal stability, good electrical and thermal conductivity, high heat resistance, arc corrosion resistance and fusion welding resistance during the on-off process, thereby ensuring the reliability of the electrical appliance operation and improving the service life.
06. Silver copper contacts, contacts, rivets AgCu
Uses: used in AC contactors, relays, power tool switches, buttons, timers, wall switches, photoelectric switches, micro switches, etc.
Characteristics: The contact has good conductivity and the surface is not easy to be oxidized. When copper (3-30%) is added, it can significantly improve the burn resistance of silver. Therefore, copper-doped contact materials can be applied to current levels up to 16A. Because the addition of copper, especially when the copper content is high (such as 10%), the material transfer phenomenon under DC working conditions can be reduced. It is widely used in the beginning of the whole electrical field, and can also replace the silver integrated contacts.
07. Silver tin oxide indium oxide contacts, contacts, rivets AgSnO2In
Uses: Used in relays, contactors, air switches, motor protectors, micro switches, instruments, household appliances, automotive appliances (light switches, starter motors and other load switches), leakage protection switches, etc.
Characteristics: Silver tin oxide indium oxide (AgSnO2ln203) is currently the most commercially valuable alternative material for silver cadmium oxide (AgCdO). Because it has better stability and higher hardness than silver cadmium oxide, it has better resistance. Fusion welding and burn-out resistance, especially the orientation of the needle-shaped oxide precipitated during the internal oxidation is perpendicular to the surface of the contact, is very beneficial to the performance of the contact. This material replaces Agcdo materials in the field of low-voltage electrical appliances such as circuit breaker switches, relays, etc., especially for automotive DC appliances such as contactors, starters, light-controlled switches, and has better anti-DC metal process characteristics.
