First, military high temperature resistant materials.
Tungsten-copper alloy is used as nozzle, gas rudder, air rudder and nose cone of missiles and rocket engines in aerospace. The main requirements are high temperature resistance (3000K ~ 5000K) and high temperature airflow erosion resistance. The transpiration refrigeration effect formed by copper volatilization at high temperature (copper melting point is 1.083℃) is mainly used to reduce the surface temperature of tungsten copper and ensure its use under extreme high temperature conditions.
Second, electrical alloy for high voltage switch
Tungsten-copper alloy 128kV in high voltage switch? SF6 circuit breaker WCu/CuCr and high voltage vacuum load switch (12kV? 40.5KV？ 1000A), widely used in lightning arresters. The high-voltage vacuum switch has the advantages of small volume, easy maintenance and wide application range, and can be used in humid, flammable, explosive and corrosive environments. The main performance requirements are arc ablation resistance, fusion welding resistance, low cut-off current, low gas content and low thermal ion emission ability. In addition to general macro performance requirements, porosity and microstructure performance are also required, so special processes are needed, such as vacuum degassing and vacuum infiltration.
Thirdly, electro-machining electrodes.
Copper or graphite electrode was used in the early EDM, which is cheap but not resistant to ablation. At present, it has been basically replaced by tungsten-copper electrode. The advantages of tungsten-copper electrode are high temperature resistance, high high temperature strength, arc ablation resistance, good electrical and thermal conductivity and fast heat dissipation. Applications focus on EDM electrodes, resistance welding electrodes and high voltage discharge tube electrodes.
Electromachined electrodes have the characteristics of many varieties, small batch and large total quantity. Tungsten-copper materials used as electrochemical machining electrodes should have as high density and uniformity as possible, especially slender rod-shaped, tubular and special-shaped electrodes.
Fourthly, microelectronic materials.
Tungsten-copper electronic packaging and heat sink materials have both low expansion characteristics of tungsten and high thermal conductivity of copper. The thermal expansion coefficient and thermal conductivity can be changed by adjusting the composition of tungsten and copper, thus providing a wider application range for tungsten and copper. Tungsten-copper materials are widely used in semiconductor materials because of their high heat resistance, good thermal conductivity and matching thermal expansion coefficient with silicon wafers, gallium arsenide and ceramic materials. Suitable for high-power device packaging materials, heat sink materials, heat dissipation elements, ceramics, gallium arsenide substrates? [ 1]。
Tungsten-copper composite is a two-phase pseudoalloy mainly composed of tungsten and copper, and it is a metal-based composite. Because the physical properties of copper and tungsten are very different, they can't be produced by melting and casting, and powder alloy technology is generally used.
Tungsten-copper alloys are widely used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries. Secondly, it will also be used to manufacture high-voltage electrical switch contacts with arc ablation resistance, high-temperature components such as rocket nozzle throat liner and tail rudder, as well as electric machining electrodes, high-temperature molds and other occasions that need electrical and thermal conduction and high-temperature use? [2]。 Tungsten-copper alloy combines the advantages of copper and tungsten, and has high strength, high specific gravity, high temperature resistance, arc ablation resistance, good electrical conductivity and good machinability. High-quality tungsten powder and oxygen-free copper powder are used, and isostatic pressing (high temperature sintering-copper infiltration) process is adopted to ensure the purity and proportion of products are accurate, the structure is fine and the performance is excellent. Good arc extinguishing performance, good electrical conductivity, good thermal conductivity and small thermal expansion? [2]。 Tungsten-copper alloy has low expansibility, wear resistance and corrosion resistance of tungsten and high conductivity and thermal conductivity of copper, and is suitable for various machining. W-Cu alloy can be produced and processed according to user's requirements. W-Cu alloy generally adopts powder metallurgy process: crushing-mixing-pressing-sintering and infiltration. [ 1]。
Tungsten copper electrode
welding electrode
Tungsten-copper alloy has high temperature resistance, arc ablation resistance, high specific gravity, good electrical and thermal conductivity, easy processing and is suitable for welding electrodes.
tungsten copper alloy rod
Tungsten-copper is a composite material refined by static pressure forming, high temperature sintering and copper infiltration, using the excellent metal characteristics of high-purity tungsten powder and the plasticity and high conductivity of high-purity copper powder. Good arc extinguishing performance, good electrical and thermal conductivity, small thermal expansion, no softening at high temperature, high strength, high density and high hardness.
W-Cu electronic package
Tungsten-copper electronic packaging material: it has both low expansion characteristics of tungsten and high thermal conductivity of copper, and its thermal expansion coefficient and conductivity can be changed by adjusting the composition of the material, which provides convenience for the use of the material.
Tungsten copper tube
Tungsten-copper alloy tubes are widely used in cemented carbide and insoluble metals. Because the tungsten-copper alloy is easy to process, the application of tungsten copper tube plays a great role in the case that the surface needs easy cutting and the inner diameter is small.
W-Cu alloy wire
Precautions for use:
Colloidal graphite should not be placed on the surface of 1. tungsten copper wire. When the temperature is above 1000℃, avoid putting tungsten copper wire with iron, nickel and carbon. Tungsten copper wire must be kept dry, and the relative humidity should not exceed 65% of room temperature, so as to avoid being put together with acidic or alkaline things.
2. After cleaning the tungsten copper wire, put it in a dry container to avoid direct contact with air and prevent oxidation? [ 1]。