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Copper–tungsten

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-resistant, highly thermally and electrically conductive, and easy to machine.

Parts are made from the CuW composite by pressing the tungsten particles into the desired shape, sintering the compacted part, then infiltrating with molten copper. Sheets, rods, and bars of the composite mixture are available as well.

Commonly used copper tungsten mixtures contains 10–50 wt.% of copper, the remaining portion being mostly tungsten. The typical properties is dependent on its composition. The mixture with less wt.% of copper has higher density, higher hardness, and higher resistivity. The typical density of CuW90 , with 10% of copper, is 16.75 g/cm and 11.85 g/cm for CuW50 . CuW90 has higher hardness and resistivity of 260 HB kgf/mm and 6.5 µΩ.cm than CuW50.

Typical properties of commonly used copper tungsten composition

Composition

Density

Hardness

Resistivity

IACS

Bending strength

wt. %

g/cm≥

HB Kgf/mm≥

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