Tungsten Copper

Tungsten Copper alloy is the composite of Tungsten and Copper, which own the excellent performances of Tungsten and Copper, such as heat-resistant, ablate-resistant, high-intensity, excellent thermal and electrical conductivity. It is easy to be machined. It is used widely in such industries as engine, electrical power, electron, metallurgy, spaceflight and aviation. Using CIP formation, sintered tungsten skeleton and infiltrating copper (silver) technology, large size and special shape products of tungsten-copper (silver) composites with 6-90 percent of copper are produced, such as electric contacts, electrode, refractory parts, heat sinks and parts of rocket, We can also produce sheet material, tubing, plate and other small products by mould pressing, extrusion pressing and MIM.

Copper Tungsten Alloys--Refractory Metal Composites

Copper Tungsten Alloys--Refractory Metal Composites
Eagle refractory metal composite materials are a combination of tungsten or tungsten carbide combined with copper or silver. The manufacturing process is to press the refractory (tungsten or tungsten carbide), sinter the pressed compact at a high temperature, and infiltrate with copper or silver. All this is done under very closely controlled conditions. The result is a relatively hard materials with superior arc and wear resistance, high physical properties at elevated temperatures, and good electrical and thermal conductivity.

Tungsten Copper Alloy

Midwest Tungsten Service tungsten copper alloys are the perfect choice where high density, high thermal conductivity, or low thermal expansion are important. Electrical contacts, heat sinks, and resistance welding electrodes are all applications where MTS tungsten copper alloys can do the job. Check the options and properties below to determine which of our alloys is best suited to your needs. Most sizes and shapes can be supplied with short lead times. We can also manufacture parts from these materials to your speci

Advantages:
• High arc resistance combined with good electrical conductivity
• High thermal conductivity
• Low thermal expansion
Applications:
• Arc contacts and vacuum contacts in high/medium voltage breakers or vacuum interruptors
• Electrodes in electric spark erosion (EDM) cutting machines
• Heat sinks for passive cooling of electronic devices
• Electrodes for resistance welding

Thermal conductivity of tungsten copper composites

Thermal conductivity of tungsten copper composites
As the speed and degree of integration of semiconductor devices increases, more heat is generated, and the performance and lifetime of semiconductor devices depend on the dissipation of the generated heat. Tungsten–copper alloys have high electrical and thermal conductivities, low contact resistances, and low coefficients of thermal expansion, thus allowing them to be used as a shielding material for microwave packages, and heat sinks for high power integrated circuits (ICs). In this study, the thermal conductivity and thermal expansion of several types of tungsten–copper (W–Cu) composites are investigated, using compositions of 5–30 wt.% copper balanced with tungsten. The tungsten–copper powders were produced using the spray conversion method, and the W–Cu alloys were fabricated via the metal injection molding. The tungsten–copper composite particles were nanosized, and the thermal conductivity of the W–Cu alloys gradually decreases with temperature increases. The thermal conductivity of the W–30 wt.% Cu composite was 238 W/(m K) at room temperature.
We present the temperature dependence of the thermophysical properties for tungsten–copper composite from room temperature to 400 °C. The powders of tungsten–copper were produced by the spray conversion method and the W–Cu alloys were fabricated by the metal injection molding. Thermal conductivity and thermal expansion of tungsten–copper composite was controllable by volume fraction copper.

Tungsten Carbide Copper

Tungsten Carbide Copper

Back to Tungsten

Tungsten carbide composites can be used as dies and anvils in electrical upsetting.

Tungsten Copper Carbide is a refractory Tungsten-based composite obtained by the process of pressing, sintering and infiltrating. The Tungsten content ranges from 50% to 70% by weight. This strong material has good mechanical properties and is highly resistant to arc erosion in contact welding. It is mainly used in oil devices to protect the contact from oxidation.

CuWC50 and CuWC56 grades have excellent resistance to mechanical wear and are mainly used for electrical contacts. CuWC50, with higher copper content and electrical conductivity, is used in heavy duty contactors and transfer switches. CuWC56, higher in strength, is used where high impact forces may be encountered and greater wear resistance is desired, such as tap changers and arcing contacts in oil breakers.
Due to its high hardness and strength, CuWC70 is used in more severe electrical upsetting and electro forging applications.

Tungsten-Copper Composite

Tungsten-Copper Composite

Tungsten based composites are strong refractory metal materials manufactured by a strictly controlled process involving pressing, sintering and infiltrating with copper or silver. They are highly resistant to heat, electric arc, wear and deformation at high temperature welding, flash butt and spot welding. They also have excellent electrical and thermal conductivity. The properties of Tungsten composites are related to the copper/silver-to-Tungsten ratio. If the Tungsten content improves, the electric arc and wear resistance will increase while the thermal and electrical conductivity, on the contrary, reduce.

Due to their unique properties, Tungsten based composites are widely used where the combination of good electrical and/or thermal conductivity and low thermal deformation is necessary, for example:

In electric resistance welding as electrical contacts or heat sinks.
In electrodes for electrical discharge machining (EDM) and electrochemical machining (ECM).

Copper Tungsten Applications

CuW alloys are used where the combination of high heat resistance, high electrical and thermal conductivity, and low thermal expansion are needed. Some of the applications are in electric resistance welding, as electrical contacts, and as heat sinks. As contact material the alloy is resistant to erosion by electric arc. WCu alloys are also used in electrodes for electrical discharge machining and electrochemical machining.
The CuW75 alloy, with 75% of tungsten, is widely used in chip carriers, substrates, flanges and frames for power semiconductor devices. The high thermal conductivity of copper together with the low thermal expansion of tungsten allows thermal expansion matching to silicon, gallium arsenide, and some ceramics. Other materials for this applications are CuMo alloy, AlSiC, and Dymalloy.
Alloy with 70-90% of tungsten is used in liners of some specialty shaped charges. The penetration is enhanced by factor 1.3 against copper for homogeneous steel target, as both the density and the break-up time are increased. Tungsten powder based shaped charge liners are especially suitable for oil well completion. Other ductile metals can be used as binder in place of copper as well. Graphite can be added as lubricant to the powder.