Tungsten-copper

[WCu 50/50 - 90/10]

Tungsten-copper (WCu) is a composite material based on tungsten with approx. 50-90% W and the rest copper. It combines the high hardness, high modulus of elasticity and wear and erosion resistance of tungsten with the very good electrical and thermal conductivity of copper. This makes WCu grades suitable for industrial applications with high thermal and electrical loads, e.g. as contacts, electrodes and thermal management components. The material properties depend on the respective composition; a compact overview of grades can be found below and in the linked data sheets.

Grades & data sheets

Variety	Composition	Density	Electrical conductivity	Thermal conductivity	Available as	Data sheet
WCu 50/50	W 50% / Cu 50%	12.0 ± 0.3 g/cm³	≈ 60 % IACS	≈ 220 W/m-K	Discs, rods/bars, plates, tubes, finished parts	On request
WCu 60/40	W 60% / Cu 40%	13.0 ± 0.3 g/cm³	≈ 54 % IACS	≈ 210 W/m-K	Discs, rods/bars, plates, tubes, finished parts	On request
WCu 70/30	W 70% / Cu 30%	14.0 ± 0.3 g/cm³	≈ 48 % IACS	≈ 180 W/m-K	Discs, rods/bars, plates, tubes, finished parts	Material data sheet
WCu 75/25	W 75% / Cu 25%	14.7 ± 0.3 g/cm³	≈ 44 % IACS	≈ 170 W/m-K	Discs, rods/bars, plates, tubes, finished parts	Material data sheet
WCu 80/20	W 80% / Cu 20%	15.3 ± 0.3 g/cm³	≈ 41 % IACS	≈ 165 W/m-K	Discs, rods/bars, plates, tubes, finished parts	Material data sheet
WCu 90/10	W 90% / Cu 10%	17.2 ± 0.2 g/cm³	≈ 40 % IACS	≈ 160 W/m-K	Discs, rods/bars, plates, tubes, finished parts	On request

The key features are as follows: ASTM B702, ISO 5182; contacts & electrodes

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Density: 14.7 g/cm³

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Thermal conductivity: 170 W/m·K

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Electrical conductivity: ≈ 40-60 % IACS (depending on variety) S/m

Supply programme

Rods, bars, disks (in stock), plates, tubes and finished parts according to customer drawings.

Properties

– Combines high bending/wear and erosion resistance (W) with good electrical & thermal conductivity (Cu)
– Density approx. 12.0-17.2 g/cm³ depending on grade
– Electrical conductivity approx. 40-60 % IACS (depending on grade)
– Good heat dissipation, temperature stable
– Better machinability than pure tungsten

Applications

– Electrical contacts/switching contacts, spark/arc exposure
– Resistance/spot welding: electrodes & inserts (ISO 5182)
– EDM/erosion electrodes, burn-off resistant contacts
– Thermal management/heat sinks, precise inertia/damping components

Do you need further information?

Specifications / standards

– ASTM B702 (Copper-Tungsten Electrical Contact Material)
– DIN EN ISO 5182 (Resistance welding – Materials for electrodes and auxiliary equipment)

Questions? We’re happy to help.

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