wolframkopermetal

Tungsten copper alloy is an alloy composed of tungsten and copper. The copper content of commonly used alloys is 10% to 50%. The alloy is prepared by powder metallurgy and has good electrical and thermal conductivity, good high-temperature strength and certain plasticity. At very high temperatures, such as above 3000°C, the copper in the alloy is liquefied and evaporated, absorbing a large amount of heat and reducing the surface temperature of the material. Therefore, this type of material is also called metal sweating material.

Performance purposes

Tungsten copper composite material is a two-phase structure pseudo alloy mainly composed of tungsten and copper elements. It is a metal matrix composite material. Due to the large physical properties of copper metal and tungsten, they cannot be produced by smelting and casting. Powder alloy technology is generally used for production.

Tungsten copper alloy is widely used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries. Secondly, it is also used to manufacture contacts of high-voltage electrical switches that are resistant to arc ablation, as well as high-temperature components such as rocket nozzle throat linings and tail rudders. It is also used as an electrode for electrical machining, high-temperature molds, and other products that require electrical conductivity, thermal conductivity, and high-temperature use. occasion.

Main Application
Tungsten-copper alloy combines the advantages of metal tungsten and copper. Among them, tungsten has a high melting point (the melting point of tungsten is 3410°C and the melting point of copper is 1080°C) and high density (the density of tungsten is 19.34g/cm3 and the density of copper is 8.89 g/cm3) ; Copper has excellent electrical and thermal conductivity. Tungsten-copper alloy (generally composed in the range of WCu7~WCu50) has a uniform microstructure, high temperature resistance, high strength, arc ablation resistance, and high density; it has moderate electrical and thermal conductivity and is widely used in military high-temperature resistant materials. , electrical alloys for high-voltage switches, electrical machining electrodes, and microelectronic materials, as parts and components, are widely used in aerospace, aviation, electronics, electric power, metallurgy, machinery, sports equipment and other industries.

1. Military high temperature resistant materials

Tungsten-copper alloys are used in aerospace as nozzles, gas rudders, air rudders, and nose cones for missiles and rocket engines. The main requirements are high temperature resistance (3000K~5000K) and high-temperature airflow resistance. Copper is mainly used under high temperatures. The refrigeration effect of sweating caused by volatilization (the melting point of copper is 1083°C) reduces the surface temperature of tungsten copper, ensuring its use under extreme conditions of high temperature.

2. Electrical alloys for high-voltage switches

Tungsten-copper alloy is widely used in high-voltage switches, 128kV SF6 circuit breakers WCu/CuCr, and high-voltage vacuum load switches (12kV 40.5KV 1000A) and arresters. High-voltage vacuum switches are small in size, easy to maintain, have a wide range of use, and can be used in wet, Used in flammable, explosive and corrosive environments. The main performance requirements are resistance to arc ablation, resistance to fusion welding, small cut-off current, low gas content, and low thermal electron emission capability. In addition to conventional macroscopic performance requirements, porosity and microstructural properties are also required, so special processes must be adopted, including complex processes such as vacuum degassing and vacuum infiltration.

3. Electrical machining electrodes

In the early days of EDM electrodes, copper or graphite electrodes were used, which were cheap but not resistant to ablation. They have basically been 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 spark electrodes, resistance welding electrodes and high-voltage discharge tube electrodes.

The characteristics of electrical machining electrodes are a wide variety of specifications, small batches and large total quantities. Tungsten copper materials used as electrical machining electrodes should have the highest possible density and structural uniformity, especially slender rod-shaped, tubular and special-shaped electrodes.

4. Microelectronic materials

Tungsten copper electronic packaging and heat sink materials have both the low expansion characteristics of tungsten and the high thermal conductivity characteristics of copper. Its thermal expansion coefficient and thermal conductivity can be changed by adjusting the composition of tungsten copper, thus providing tungsten copper with more advantages. Wide range of applications. Because tungsten copper material has high heat resistance and good thermal and electrical conductivity, and has a thermal expansion coefficient that matches silicon wafers, gallium arsenide and ceramic materials, it is widely used in semiconductor materials. Suitable for high-power device packaging materials, heat sink materials, heat dissipation components, ceramics and gallium arsenide bases, etc.

Material properties
Tungsten-copper alloy combines the advantages of copper and tungsten, with high strength, high specific gravity, high temperature resistance, arc ablation resistance, good electrical conductivity, electrothermal performance, and good processing performance. It uses high-quality tungsten powder and oxygen-free copper powder, and applies isostatic pressing (high temperature sintering-copper infiltration) to ensure product purity and accurate proportions, fine structure, and excellent performance. It has good arc-breaking performance, good electrical conductivity, and good thermal conductivity. , small thermal expansion.

Classification
Since tungsten and copper are immiscible, tungsten-copper alloy has the low expansion, wear resistance, and corrosion resistance of tungsten and the high electrical and thermal conductivity of copper, and is suitable for various mechanical processing. Tungsten-copper alloy can be produced and processed in terms of tungsten-copper ratio and size according to user requirements. Tungsten copper alloy generally uses the powder metallurgy process to first make powder - mix ingredients - press molding - sintering and infiltration.

Tungsten copper electrode
Tungsten copper alloy rod
Tungsten copper is a composite material refined by utilizing the excellent metallic properties of high-purity tungsten powder and the plasticity and high conductivity of high-purity copper powder through static pressure molding, high-temperature sintering, and copper dissolution. It has good arc-breaking performance, good electrical and thermal conductivity, small thermal expansion, no softening at high temperatures, high strength, high density, and high hardness.

Tungsten copper electronic packaging sheet
Tungsten copper electronic packaging material: It has both the low expansion characteristics of tungsten and the high thermal conductivity characteristics of copper. Its thermal expansion coefficient and electrical conductivity can be changed by adjusting the composition of the material, thus providing convenience for the use of the material.

Tungsten copper tube
Tungsten copper alloy tubes are widely used in cemented carbide and refractory metals. Because tungsten copper alloy is easy to machine, the use of tungsten copper tube plays a great role when the surface needs to be easy to machine and the inner diameter needs to be small.

Tungsten copper alloy wire
Precautions for use:

1.1. Colloidal graphite cannot be placed on the surface of tungsten copper wire. When the temperature is above 1000 degrees, avoid placing tungsten copper wire together with iron, nickel and carbon. Tungsten copper wire must be placed in a dry place, the relative humidity should not exceed 65% of room temperature, and avoid being placed together with acidic or alkaline things.

2. 1. After cleaning the tungsten copper wire, place it in a dry container to avoid direct contact with air to prevent oxidation.