What metal is the copper chrome contact material?

    High-quality silver-tungsten alloy contact material (contact material) is an electrical contact material used for power switches, solenoid valves, electrical connections and electrical equipment wiring components, also known as electrical contact materials, generally divided into weak current contact materials And two kinds of contact materials for weak current installation.

    Contact is the thinnest and most important part of electrical switches and a part that is very prone to problems: once the professional silver-tungsten alloy contact system software fails to work normally, such as a short circuit fault in the power supply system, the vacuum circuit breaker contacts are cut off. , will cause extremely obvious adverse effects.

    Expansion material:

    physical properties

    1. General physical properties: The precision copper-silver alloy contact material should have suitable strength, and the smaller hardness can expand the total contact area under a certain contact working pressure, reduce the contact resistance, and reduce the contact hot during static data contact. And electrostatic arc welding trend, and can reduce the moving contact jump in the whole process of closing. Higher strength can reduce the total arc welding area and improve the ability to resist mechanical equipment damage.

    The contact material should have a suitable ductility displacement coefficient. A higher ductility displacement coefficient is very easy to achieve the specified value of plastic deformation, so the protective film is very easy to be damaged, which is beneficial to reduce the protective film resistor, and a lower elastic deformation can expand the total contact area of elastic deformation.

    2. Electrical properties: The contact material should have high conductivity to reduce contact resistance, low secondary transmission and light emission to reduce the amount of electric current and arcing time.

    3. Thermophysical properties: high thermal conductivity, it is convenient for the heat formed by electric solitary or Joule pyrogen to be transmitted to the contact base as soon as possible. High specific heat, high heat of fusion, vaporization and solution vaporization. High ignition and melting point to reduce arcing tendency. Low vapor pressure to limit the relative density of alloy vapor in the cell.