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Time of issue:2020-03-17 00:00:00

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Silver tungsten

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Silver tungsten

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  Silver tungsten materials are used in industrial and domestic circuit breaker applications where good weld and erosion resistance is important. Various grades are available: - the higher silver grades have higher conductivity, and the higher tungsten grades have greater erosion and weld resistance.
  High contact pressures are required to ensure effective operation if used for frequent high current switching, where mixed oxides of silver tungsten can be formed, giving high contact resistance.
  Silver tungsten alloys contain between 25-50% silver and are mainly used for electrical contacts—generally heavy-duty devices subject to high current, such as circuit breakers, earth leakage breakers and miniature circuit breakers.

 

Name
Chemical symbol
Chemical composition(%)
Physical and mechanical properties
Ag
Impurity
W
Density/
(g/cm3)
Hardness
HB
Resistivity
(μΩ·cm)
silver-tungsten(30)
AgW(30)
70±1.5
≤0.5
allowance
11.75
75
2.3
silver-tungsten(40)
AgW(40)
60±1.5
≤0.5
allowance
12.4
85
2.6
silver-tungsten(50)
AgW(50)
50±2.0
≤0.5
allowance
13.15
105
3
silver-tungsten(55)
AgW(55)
45±2.0
≤0.5
allowance
13.55
115
3.2
silver-tungsten(60)
AgW(60)
40±2.0
≤0.5
allowance
14
125
3.4
silver-tungsten(65)
AgW(65)
35±2.0
≤0.5
allowance
14.5
135
3.6
silver-tungsten(70)
AgW(70)
30±2.0
≤0.5
allowance
14.9
150
3.8
silver-tungsten(75)
AgW(75)
25±2.0
≤0.5
allowance
15.4
165
4.2
silver-tungsten(80)
AgW(80)
20±2.0
≤0.5
allowance
16.1
180
4.6
silver-tungsten(85)
AgW(85)
15±2.0
≤0.5
allowance
16.7
195
5
Keyword:
Silver tungsten contacts
electrical contacts
Silver tungsten alloys
silver-tungsten
AgW
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