Tungsten Copper Contacts: Advancing High-Voltage And Specialized Applications

With continuous technological advancements, the relevant standards and application areas of Tungsten Copper Contacts are also constantly evolving. The national standard GB/T 8320-2025, "Copper-Tungsten and Silver-Tungsten Electrical Contacts," released in 2025, will officially come into effect in 2026. The new standard expands the application scope of copper-tungsten contacts to include electronic packaging and shielding materials, while also imposing higher requirements on the processing precision of tungsten-copper alloys and strengthening environmental protection standards. This change means that copper-tungsten contacts will demonstrate their unique advantages in more fields, especially in terms of environmental protection and high precision requirements. For example, in the field of electronic packaging, copper-tungsten contacts can be used as part of chip heat dissipation modules. Their excellent thermal conductivity and mechanical strength can effectively protect chips from high-temperature damage, while complying with RoHS environmental standards and being free of harmful substances such as lead and mercury.

In terms of technological innovation, copper-tungsten contacts have achieved significant breakthroughs in the fields of nuclear fusion and high-voltage electrical appliances. Recent advancements in precision injection molding technology for tungsten-copper materials and the research and development of tungsten-molybdenum high-entropy alloy materials have further enhanced the performance of copper-tungsten contacts. The application of these technologies not only enhances the material's high-temperature resistance but also improves its stability in extreme environments, further expanding its application potential in cutting-edge fields such as new energy and nuclear fusion. Copper-tungsten contacts produced using precision injection molding technology achieve dimensional accuracy down to the micrometer level and surface roughness as low as Ra0.8μm, resulting in lower contact resistance and less heat generation. Tungsten-molybdenum high-entropy alloys exhibit stronger oxidation and creep resistance at high temperatures, maintaining structural stability even in environments exceeding 1000℃.

In material performance comparisons, copper-tungsten contacts demonstrate superior arc resistance and high-voltage adaptability compared to pure silver and copper-chromium contacts. Although its conductivity is slightly lower than that of pure silver contacts (pure silver conductivity is approximately 63% IACS, while copper-tungsten contacts are approximately 30-40% IACS), its high-temperature resistance and arc resistance make it superior in medium- and high-voltage applications. For example, in 10kV high-voltage circuits, the arc loss of copper-tungsten contacts is only 1/5 that of pure silver contacts, extending their service life by more than three times. At the same time, the cost of copper-tungsten contacts is lower than that of pure silver contacts (pure silver is about 3-5 times the price of copper-tungsten), making them a more cost-effective choice in the field of high-voltage electrical appliances.

In power systems, Tungsten Copper Contacts are widely used in core equipment such as high-voltage circuit breakers, disconnectors, and grounding switches. Their high melting point and arc resistance ensure that they effectively prevent contact burnout or melting during high-voltage current transmission, extending the service life of the equipment. For example, in circuit breakers with voltage levels of 110kV and above, copper-tungsten contacts, as a key component of the arc-extinguishing chamber, can quickly disconnect the circuit under short-circuit currents of tens of thousands of amperes. The arc generated between the contacts is rapidly cooled and extinguished at high temperatures, and the equipment operates with almost no noticeable arc sound, only a slight humming sound when current flows. In the industrial sector, copper-tungsten contacts are also used in critical equipment such as molded case circuit breakers and universal circuit breakers. Their anti-welding properties are particularly outstanding in industrial control circuits with frequent switching operations; even under high current surges, the contacts do not stick together, ensuring reliable circuit disconnection. Specialized applications, such as nuclear fusion devices and aerospace electrodes, place even higher demands on materials, and copper-tungsten contacts, with their extremely high temperature resistance and conductivity, meet these application requirements. In nuclear fusion experimental devices, contacts must withstand extreme temperature changes and strong radiation environments; the stable performance of copper-tungsten contacts ensures the continuous operation of the experimental equipment, and their surfaces remain smooth, without cracks or deformation even after long-term use.

Looking to the future, the development trend of Tungsten Copper Contacts mainly focuses on formula optimization and process innovation. By adjusting the tungsten-copper ratio (e.g., increasing the tungsten content from 70% to 90%), its overall performance can be further improved. Furthermore, by utilizing arc remelting technology to improve the material's microstructure, copper-tungsten contacts will gradually replace traditional silver contacts in future high-voltage electrical appliances, AI server power modules, and high-voltage relays for new energy vehicles. With the continuous growth in demand from emerging fields such as new energy and nuclear fusion, the market size of copper-tungsten contacts is expected to continue expanding, with an average annual growth rate potentially exceeding 12%. In the new energy vehicle sector, copper-tungsten contacts will be used in high-voltage DC relays. Their low contact resistance and high reliability effectively improve the energy conversion efficiency of battery systems, extending the driving range of electric vehicles.