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Silver Tungsten Alloy

Silver Tungsten Alloy

Description
Silver tungsten alloys, also known as silver tungsten carbides, are used in industrial and domestic circuit breaker applications where good weld and erosion resistance is important. 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, and mixed oxides of silver tungsten can be formed to give high contact resistance.
Silver tungsten alloy has proven to be an excellent material because of its ability to resist contact "sticking" or welding and also because of its resistance to oxidation. JBNR produces AgWC materials ranging from 35% silver and 65% tungsten carbide to 60% silver and 40% tungsten carbide. In some instances, it is advantageous to have a combination of tungsten and tungsten carbide mixed with silver.

Application
Silver tungsten alloys contain between 15-70% silver and are mainly used for electrical contacts—generally heavy-duty devices subject to high current, such as moving contact for circuit-breakers between 100 and 800 A, earth leakage breakers, moving contact for air circuit breaker between 1000 and 10000 A, thermostats, miniature circuit breakers, arcing contact for large size contactors, moulded-case circuit breakers and heavy-load AC/DC contactors, etc.

Performance of Silver Tungsten

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

Technical Parameters of Silver Tungsten Carbide

Material Nominal Composition Density g/cm³ Hardness HV10 Electrical Conductivity   %I.A.C.S m/ mm²
WCAg 35 13.0 170 35 20
WCAg 50 12.2 150 39 22
WCAg 60 11.7 140 42 24

Package and Transportation
We pack silver tungsten alloy in plywood case and send them by ocean or air.

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