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Tungsten – Copper Alloy
(W-80 wt% / Cu 20 wt%)
Applications:
High temperature furnace components, heat sinks, EDM electrodes, high-voltage discharge tubes, high voltage arc contacts, electrical contacts, vacuum contacts, electrodes for resistance welding and spark erosion, leaders, balance weights, dies for castings, spreaders, microwave carriers, hermetic package bases and housings, ceramic substrate carriers, medical components, heating elements, high speed tools.
Properties:
The electrical and thermal properties of the alloy vary with different proportions. Copper increases the thermal conductivity, which is a main consideration when being used in circuit breakers. Electrical resistivity, with an increase in the percentage of tungsten present in the alloy, ranges from 3.16 at 55% tungsten to 6.1 when the alloy contains 90% tungsten. An increase in tungsten leads to an increase in ultimate tensile strength up until the alloy reaches 80% tungsten and 20% copper with an ultimate tensile strength of 663 MPa. After this mixture of copper and tungsten, the ultimate tensile strength then begins to decrease rapidly.
Cu 20 wt% (+/- 2 wt%)
Density 15.5 gm/cm3
Conductivity (IACS) 34%
Resistance 5.0 μ ohm.cm maximum
Hardness (HB) 220 Kgf/mm2
Bend Strength 736 MPa
Coefficient of thermal Expansion 8.8 x 106 k1
Thermal Conductivity 180 W/m-k-1
