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Tungsten Copper Composite

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Tungsten based composites are strong refractory metal materials manufactured by a strictly controlled process involving pressing, sintering and infiltrating with copper or silver. They are highly resistant to heat, electric arc, wear and deformation at high temperature welding, flash butt and spot welding. They also have excellent electrical and thermal conductivity. The properties of Tungsten composites are related to the copper/silver-to-Tungsten ratio. If the Tungsten content improves, the electric arc and wear resistance will increase while the thermal and electrical conductivity, on the contrary, reduce.

Due to their unique properties, Tungsten based composites are widely used where the combination of good electrical and/or thermal conductivity and low thermal deformation is necessary, for example:

  • In electric resistance welding as electrical contacts or heat sinks.
  • In electrodes for electrical discharge machining (EDM) and electrochemical machining (ECM).

Physical and Mechanical Properties:

Composites

Nominal Composition
(% Weight)

Density
(g/cm3, ≥)

Electrical Resistivity
(20°C, µΩ·cm, ≤)

Electrical conductivity
(IACS%, ≥)

Hardness(≥)
Brinell Hardness

Bending Strength

MPa

Kgf/mm2

MPa

Kgf/mm2

CuW50

50% Copper
50% Tungsten

11.85

3.2

54

1128

115

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CuW55

45% Copper
55% Tungsten

12.3

3.5

49

1226

125

---

---

CuW60

40% Copper
60% Tungsten

12.75

3.7

47

1373

140

---

---

CuW65

35% Copper
65% Tungsten

13.3

3.9

44

1520

155

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---

CuW70

30% Copper
70% Tungsten

13.8

4.1

42

1716

175

667

68

CuW75

25% Copper
75% Tungsten

14.5

4.5

38

1912

195

706

72

CuW80

20% Copper
80% Tungsten

15.15

5.0

34

2158

220

736

75

CuW85

15% Copper
85% Tungsten

15.9

5.7

30

2354

240

765

78

CuW90

10% Copper
90% Tungsten

16.75

6.5

27

2550

260

804

82

CuW50 and CuW55 have the lowest Tungsten contents. They are both good switching and contact materials for oil filled devices. CuW55 is also used for arcing contacts in oil circuit breakers and arcing edges of selectors and switchblades in transformer tap changers.

CuW65 and CuW70 are used as contact materials in severe arcing applications including gas, oil and some air circuit breakers. They are also used for arcing edges on selectors and reversing switch blades.

CuW75 and CuW80 are used as contact materials under extreme arcing conditions. Applications include arcing contacts in gas and oil circuit breakers, contactors and transformer tap changers, arcing plates and arc runners in power switching equipment.

CuW85 and CuW90 have the highest Tungsten content. They are used as contact materials where resistance to contact welding, sticking and arc erosion are critical. They also provide satisfactory heat and current interruption capabilities. Typical applications are power vacuum switches and high power spark gap electrodes, etc..

Specifications:

Type

Length (mm)

Width (mm)

Thickness (mm)

Diameter (mm)

Tungsten-Copper rod

2 ~ 300

---

---

2 ~ 320

Tungsten-Copper plate

10 ~ 300

10 ~ 300

2 ~ 200

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other types

cube, ring, block, Tungsten-Copper electrode and other customized shaped products

Tungsten-Copper products: