Tungsten Copper Composite Material as Electrical Contact

Tungsten copper composite material is widely used to produce electrical contact.

Tungsten copper is a pseudo alloy composed of two insoluble metals of tungsten and copper. It combines the high melting point, high hardness, low expansion coefficient of tungsten and the high electrical and thermal conductivity of copper. It is a kind of material with good performance and excellent composite material. Tungsten copper material not only has good thermal conductivity and low thermal expansion coefficient, but also can be designed by changing its tungsten copper content to design its thermal conductivity and thermal expansion coefficient. These properties make tungsten copper an excellent material for electrical contacts.

It is a very important application of tungsten copper materials is as electrical contacts for high-voltage electrical switches. Electrical contact materials, also called contacts or contacts, are key components of high and low voltage electrical appliances. They are responsible for making and breaking currents, which directly affect the reliability and service life of switches and electrical appliances.

During the arcing process of the tungsten-copper alloy contact, the low-melting-point copper on the surface melts first, and is adsorbed in the capillary holes of the tungsten skeleton due to capillary action. It evaporates under the action of the high temperature of the arc and takes away a large amount of heat, so that the tungsten skeleton is cooled. The contact has good breaking performance. Due to the high melting point of the tungsten skeleton, the ablation in the arc is very small, and even if the local temperature is too high, fusion welding will not occur, thereby ensuring the stability, reliability and long life of the switch performance. And the higher the tungsten content, the better the performance of anti-burning damage, but the conductivity is low, and the specific use needs to be selected.

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