Tungsten and Power Engineering
Electrical contacts are the key components in high- and medium-voltage devices. They are responsible for making and breaking currents. They directly affect the reliability and service life of switches and electrical appliances, so they are called the "heart" of circuits.
W-Cu series electric contact alloy
X-Cu arcing in the atmosphere will cause oxidation of tungsten. Therefore, in the switch working in the atmosphere, the main purpose of the W-Cu material is only the initial arc starting contact, and the continuous large current load is borne by the copper contact, and When W-Cu is used to transport the main current, oil or SF6 must be used as a protective medium to prevent oxidation.
W-Ag series contact alloy
X-Ag series contact alloys are another common type of contact materials commonly used in tungsten-based electrical contact materials. Compared with WCu, W-Ag materials have lower resistance and better resistance to oxidation and resistance. The ablation performance belongs to high and low electrical contact materials, and is used as contact materials in AC appliances, circuit breakers, relays, starters and switching devices.
WC-Ag series contact alloy
The hardness of WC-Ag series contact alloys is higher than W-Ag and W-Cu, so it is more wear-resistant and has a longer working life. It is often used in low-voltage switches and safety switches, but this type of contact material has fewer uses.
other
Because the thermal expansion coefficient of tungsten is similar to that of silicon, it is often used as a support substrate and contact for large-size single-crystal silicon wafers in large rectifiers.
