Depending on the grain size of the tungsten powder and the pressing and sintering parameters, various ratios of tungsten and copper can be selected. Tungsten-Copper combines many typical properties of the individual elements, such as the hardness, wear resistance, and arc erosion resistance of tungsten, along with the excellent electrical and thermal conductivity of copper.
Tungsten-Copper is used in applications such as EDM electrodes, heat sinks, electrical contacts, medium- and high-voltage breakers, welding electrodes (resistance welding), balancing weights, and more.
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50/50 |
60/40 |
70/30 |
75/25 |
80/20 |
90/10 |
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Class A |
Class B | Class C | Class D | Class E |
– |
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Chemical Composition |
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Copper (Cu) |
50±2 |
40±2 |
30±2 |
25±2 |
20±2 |
10±2 |
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Tungsten (W) |
Rest |
Rest |
Rest |
Rest |
Rest |
Rest |
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Additives (max. %) |
1 |
1 |
1 |
1 |
1 |
1 |
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Physical Properties |
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Density (g/cm3) |
11,7 |
12,7 |
13,7 |
14,3 |
15,0 |
16,5 |
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Electrical Conductivity (% IACS)* |
56-64 |
49-57 |
44-52 |
41-48 |
38-45 |
<30 |
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Coefficient of Thermal Expansion [10−6 K-1] |
13,0 |
11,9 |
10,3 |
9,5 |
8,8 |
<7,5 |
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Thermal Conductivity (W/m * K-1] |
– |
– |
200 |
190 |
180 |
170 |
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Mechanical Properties |
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Hardness [HRB] |
69-83 |
77-90 |
85-98 |
89-102 |
94-106 |
– |
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E-modulus [GPa] |
– |
– |
220 |
260 |
280 |
290 |
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Tensile Strength |
344-413 |
379-448 |
516-585 |
585-654 |
620-689 |
700 |
Machining
CNC turning and milling operations are performed using tungsten carbide tools (hard metal). The machining properties are excellent. Compared to various copper alloys, there are no deformations due to the high hardness and high elastic modulus. A very high surface quality can be achieved with virtually burr- and notch-free edges.
ASTM Standard Specifications
- ASTM B702 (Copper-Tungsten Electrical Contact Material)
Typical Properties
- Good machinability
- High density
- Excellent dimensional stability
- Low coefficient of thermal expansion
- High surface quality
- High wear resistance
- High thermal conductivity
- High arc erosion resistance
Contact Us
You can reach us daily by email and phone between 8:30 AM and 5:00 PM. Of course, emailing is possible 24/7.
Address:
Christiaan Huygensweg 2B
5151 DN Drunen