Copper–tungsten (tungsten–copper, CuW, or WCu) is a mixture of copper and tungsten. As copper and tungsten are not mutually soluble, the material is composed of distinct particles of one metal dispersed in a matrix of the other one. The microstructure is therefore rather a metal matrix composite instead of a true alloy.
The material combines the properties of both metals, resulting in a material that is heat-resistant, ablation.
CuW composites 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 composite is resistant to erosion by electric arc. WCu alloys are also used in electrodes for electrical discharge machining and electrochemical machining.
The electrical and thermal properties of the composites vary with different proportions. An increase in copper increases the thermal conductivity, which plays a huge part when being used in circuit breakers. Electrical resistivity increases with an increase in the percentage of tungsten present in the composite, ranging from 3.16 at 55% tungsten to 6.1 when the composite contains 90% tungsten. An increase in tungsten leads to an increase in ultimate tensile strength up until the alloy reaches 80% tungsten and 20…
Tungsten has the highest melting point of the refractory metals, high density, and low coefficient of thermal expansion. It offers exceptionally high strength and good electrical resistivity at very high temperatures. Unalloyed Tungsten is very difficult to machine and fabricate. Eagle Alloys can furnish finished parts in this material in relatively quick turnaround times. We can also supply 1%, 1.5%, 2% Lanthanated, 1%, 2%, 3%, 4% Thoriated Tungsten, Tungsten Rhenium Alloys & Tungsten Carbide.
From Tungsten-Copper, we supply:
tungsten W90 Ni Fe
From these materials, we supply:
|sheets||4 mm||5 mm|
|round bars||3 mm||130 mm|
|flat bars||8 x 5 mm||100 x 30 mm|
|square bars||3 x 3 mm||60 x 60 mm|
|hexagonal bars||6 mm||32 mm|
Copper Tungsten and Tungsten Carbide Copper (CW55, CW60, CW65, CW70E, CW75, CW80)
DWD ’ copper tungsten alloys are commonly used in EDM electrodes and other electrical and electrical/thermal applications. They are also used for facing and inserts for flash and butt welding dies, projection welding electrodes, seam welding bearing inserts and facing for electro-forming and electro-forging dies.
Although they are somewhat more difficult to machine, tungsten carbide copper materials provide high mechanical properties and excellent resistance to erosion. They are commonly used in oil devices to protect the contact from oxidation.
To learn more about which copper tungsten alloy is best for your application, contact a DWD professional.
Note: Our CW70E,CW75 and CW80 materials are readily available in various stocked sizes of rods and flat bars. Please see our updated parts document for information.
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