Composite contacts refer to components used in electrical switches, relays, and other devices to conduct current. They are typically composed of multiple materials to ensure stable current conduction at high frequencies and currents, while also exhibiting good wear resistance and conductivity. There are various materials that can be chosen for fabricating composite contacts, and I will introduce several common options below.
Firstly, the base material for composite contacts can be selected from metallic materials with good conductivity, such as copper, aluminum, and silver. This ensures that current can flow stably through the contacts, and metallic materials have good thermal conductivity, which effectively dissipates heat and reduces thermal losses in the contacts.
Secondly, the surface of composite contacts can be processed with a layer of metal oxide or conductive coating to increase the hardness and wear resistance of the contact surface. Metal oxides, such as aluminum oxide and zinc oxide, can effectively prevent oxidation and corrosion of the contacts, thereby extending their service life. Conductive coatings, such as nickel and chromium, can enhance the conductivity of the contacts and reduce contact resistance.
Furthermore, composite contacts can also be coated with a layer of metal powder or carbon fiber on the base material to enhance their conductivity. Metal powders, such as copper powder and silver powder, can fill the micropores in the base material, increasing the conductive contact area of the contacts and reducing contact resistance. Carbon fiber, on the other hand, has good conductivity and wear resistance, which can effectively increase the lifespan of the contacts.
In summary, there are various materials that can be chosen for fabricating composite contacts. Selecting an appropriate combination of materials can effectively improve the conductivity, wear resistance, and stability of the contacts, ensuring the normal operation and safety of the equipment. I hope this introduction is helpful to you.
