What is tungsten copper alloy?Tungsten copper alloy material uses unique infiltration technology to avoid injection molding. Due to the addition of a large amount of molding agents, problems such as difficulty in degumming, many impurities, and large porosity, and no impurities are introduced, and the structure is uniform. Electrical contact materials made by this process are widely used in high-voltage switches (40.5kV, 630A) . As an electrode material, because of the uniform structure, it is more resistant to ablation, and it is not easy to bend at high temperature. As a semiconductor packaging material, because of less impurities, it is easy to plate silver and ion-sputtered metal coating, and has excellent performance.
See the attached table for the parameters of tungsten copper material
The use of tungsten copper alloy
Tungsten copper alloy combines the advantages of metal tungsten and copper. Among them, tungsten has a high melting point (tungsten melting point is 3410 ℃, copper melting point is 1080 ℃) and high density (tungsten density is 19.34g / cm3, copper density is 8.89g / cm3). Copper has superior electrical conductivity and thermal conductivity. Tungsten copper alloy (composition generally ranges from WCu7 to WCu50) has a uniform microstructure, high temperature resistance, high strength, arc ablation resistance, and high density; moderate electrical and thermal conductivity properties, and is widely used in military high temperature resistant materials. , High-voltage switch electrical alloys, electro-machining electrodes, microelectronic materials, as parts and components are widely used in aerospace, aviation, electronics, power, metallurgy, machinery, sports equipment and other industries.
1. military high temperature resistant materialsTungsten copper alloys are used in aerospace and aviation as missiles, rocket engine nozzles, gas rudders, air rudders, and nose cones. The main requirements are high temperature resistance (3000K ~ 5000K) and high temperature airflow erosion resistance. Copper is mainly used at high temperatures. Vaporized cooling effect (copper melting point 1083 ° C) reduces the surface temperature of tungsten copper and ensures its use under extreme conditions of high temperature.
2.Electrical alloys for high voltage switchesTungsten copper alloy is widely used in high-voltage switch 128kV? SF6 circuit breaker WCu / CuCr, and high-voltage vacuum load switch (12kV40.5KV1000A), lightning arrester. The high-voltage vacuum switch is small in size, easy to maintain, and can be used in a wide range. Use in flammable, explosive and corrosive environments. The main performance requirements are resistance to arc ablation, fusion resistance, small cut-off current, low gas content, and low hot electron emission capability. In addition to the conventional macro performance requirements, porosity and microstructure properties are also required. Therefore, special cnc machining method are required, and complex processes such as vacuum degassing and vacuum infiltration are required.
3.Electro-processing electrodeIn the early days of EDM electrodes, copper or graphite electrodes were used, which were cheap but not resistant to ablation. They were basically replaced by tungsten copper electrodes. The advantages of tungsten copper electrodes are high temperature resistance, high temperature strength, arc ablation resistance, good electrical and thermal conductivity, and fast heat dissipation. Applications focus on electric spark electrodes, resistance welding electrodes, and high-voltage discharge tube electrodes.
Electro-machined electrodes are characterized by a wide variety of specifications, small batches and large totals. Tungsten-copper materials used as electro-machined electrodes should have the highest possible density and uniformity of the structure, especially slender rod-shaped, tubular and shaped electrodes.