A Brief Analysis of the Characteristics, Processes, and Applications of Electric Horn Tungsten Contacts

In the field of electrical contact manufacturing, tungsten-based contacts have become core basic components due to their excellent high-temperature resistance and arc resistance. Among them, tungsten-copper contacts and tungsten-silver contacts are the two most widely used mainstream categories. Both use refractory metal tungsten as the base material and are highly similar in physicochemical properties, production processes, and application scenarios, making them suitable for most high-voltage and high-frequency electrical switching conditions. From a production cost perspective, copper raw materials are far more cost-effective than silver, making tungsten-copper button contacts a high-performance alternative to tungsten-silver contacts. AgW Electrical tungsten contacts are mostly used in high-end precision electrical equipment, while tungsten-copper contacts are more suitable for large-scale general electrical applications.

Tungsten Copper Solid Rivet Contacts are a typical metal-based pseudo-alloy contact material, primarily composed of tungsten and copper. Unlike single-metal alloys, the tungsten and copper do not form a solid solution, retaining their independent material properties and achieving complementary performance. Tungsten Contact Rivet for Automotive Horns, made using the composite properties of tungsten-copper pseudo-alloys, perfectly meets the frequent switching requirements of automotive horns, making it a common choice for small automotive electrical contacts, balancing performance and cost advantages.

Tungsten Copper Solid Rivet Contacts integrate the core advantages of tungsten and copper, possessing excellent comprehensive physical and chemical properties. Tungsten's high melting point, high hardness, and low coefficient of thermal expansion give the contacts excellent high-temperature resistance, corrosion resistance, arc burn resistance, and weld resistance; the addition of copper significantly improves the material's electrical and thermal conductivity and ductility, compensating for the insufficient toughness of pure tungsten. Tungsten Disc Points Contact is made of tungsten copper, which exhibits a unique sweating cooling effect in high-temperature operating environments. When the temperature rises above 3000℃, the copper components inside the contact liquefy and evaporate, carrying away a large amount of heat and effectively preventing the contact from burning and sticking at high temperatures. At the same time, the higher the copper content of the contact, the better the overall conductivity and plasticity.

Mature manufacturing processes are key to the stable mass production and performance assurance of Electric Horn Tungsten Contacts. The industry's mainstream manufacturing processes include three methods: melt infiltration, copper oxide powder method, and injection molding. Different processes are suitable for contact products of different specifications and application scenarios. Automotive Electrical Tungsten Contact Points for Horns are mostly produced using the mature melt infiltration method, which is simple to implement and produces highly dense finished products, meeting the mass production needs of automotive contacts. The melt infiltration method is the industry's mainstream process. First, high-purity tungsten powder is pressed into shape and sintered at high temperature to form a porous tungsten framework. Then, copper is filled into the pores of the framework using a liquid-phase melt infiltration process, resulting in a dense structure and stable mechanical properties.

The copper oxide powder method is a manufacturing process suitable for mid-to-high-end Electric Horn Tungsten Contacts, with a process logic different from the traditional melt infiltration method. This process first reduces copper oxide powder to obtain high-purity copper powder, then uniformly mixes the copper powder with tungsten powder and sinterstensibly. Copper tungsten plate contact points are mostly manufactured using this process. After sintering, copper forms a continuous conductive substrate, while tungsten constructs a high-strength supporting framework. This allows plate-type contacts to possess both excellent conductivity and structural strength, making them suitable for plate-type contact positions in high-voltage electrical equipment.

Injection molding is mainly used for the customized production of irregularly shaped electric horn tungsten contacts, suitable for complex non-standard contact products. During production, tungsten powder, nickel powder, and copper-tungsten powder of different particle sizes are thoroughly mixed, a special organic binder is added, and then the mixture is formed through injection molding. Finally, the binder is removed at high temperature, and the mixture is sintered to achieve density. Copper tungsten contacts for electric car horns can be processed into special irregular shapes using injection molding, matching the compact installation space of new energy vehicle horns and adapting to diverse automotive electrical assembly needs.

Electric horn tungsten contacts produced by different manufacturing processes have different performance focuses, allowing for precise adaptation to various automotive electrical scenarios. The electrical systems of horns in both new energy vehicles and traditional fuel vehicles have stringent requirements for the continuity and high-temperature resistance of the contacts. The anti-welding and arc-resistant properties of tungsten copper contacts can effectively reduce the probability of equipment failure. Electrical Tungsten Points for Car Horn, leveraging the superior properties of tungsten copper, effectively solves the problems of contact burning and adhesion caused by frequent start-stop cycles in car horns, significantly improving the service life and stability of automotive electrical components.