Copper Tungsten
This refractory metal composite materials are a combination of tungsten combined with copper or silver. The manufacturing process is to press the refractory, 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.
Advantages
- Higher thermal conductivity
- Low thermal expansion
- High arc resistance combined with good electrical conductivity
Applications Involving Copper Tungsten
- Heat sinks as passive cooling elements of electronic devices
- Electrodes for resistance welding
- Electrodes in electric spark erosion cutting machines
- Arcing contacts and vacuum contacts in high and medium voltage breakers or vacuum interruptions
Copper Tungsten Technical Data
| Composition | Density | Hardness | Resistivity | IACS | Bending Strength |
|---|---|---|---|---|---|
| g/cm3≥ | HB Kgf/mm2≥ | µΩ.cm≤ | %≥ | Mpa≥ | |
| W50/Cu50 | 11.85 | 115 | 3.2 | 54 | -- |
| W55/Cu45 | 12.30 | 125 | 3.5 | 49 | -- |
| W60/Cu40 | 12.75 | 140 | 3.7 | 47 | -- |
| W65/Cu35 | 13.30 | 155 | 3.9 | 44 | -- |
| W70/Cu30 | 13.80 | 175 | 4.1 | 42 | 790 |
| W75/Cu25 | 14.50 | 195 | 4.5 | 38 | 885 |
| W80/Cu20 | 15.15 | 220 | 5.0 | 34 | 980 |
| W85/Cu15 | 15.90 | 240 | 5.7 | 30 | 1080 |
| W90/Cu10 | 16.75 | 260 | 6.5 | 27 | 1160 |
Tungsten Plates and Bars
They are mainly used for making finished tungsten wire, rods and plates and additives to precision alloys.
Tungsten Rods and Wires
They are mainly for electrical light sources, electrical contacts for vacuum coated films and heating elements, etc.