AgW30 soft annealed (+A)

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Description

Contact material. Silver tungsten materials are relatively rare in Europe, more commonly used in the US. With 20 to 80% W, they have the highest erosion resistance at medium to high switching capacities. This is especially true for high-W materials made by the soaking process. Abrasion and erosion are extremely low compared to other contact materials due to the high hardness and good arc resistance of such materials. However, the tendency to weld at startup is similarly unfavorable as silver-nickel. This relatively strong tendency to sweat must be compensated with design measures on the switching device or by using a non-symmetrical material pairing (mating contact piece of silver-graphite). The burnup is the smallest at a tungsten content of about 80%. Silver tungsten composites are preferred in the United States in low-voltage circuit breakers with rated currents up to 1000 A and short circuit switching currents up to 50,000 A. In addition, they are used in circuit breakers.

Related Standards

This material data has been provided by WIAM.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

20.0 °C

11.9 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elastic modulus

23.0 °C

83 GPa

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Typical for Silver

Hardness, Vickers

20.0 °C

110 [-]

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Poisson's ratio

23.0 °C

0.37 [-]

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Typical for Silver

Shear modulus

23.0 °C

30 GPa

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Typical for Silver

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

1.9E-5 1/K

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Typical for Silver

Melting point

962 °C

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Typical for Silver

Specific heat capacity

23.0 °C

234 - 251 J/(kg·K)

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Typical for Silver

Thermal conductivity

20.0 °C

326 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

4.30E+7 S/m

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Electrical resistivity

20.0 °C

2.3E-8 Ω·m

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Chemical properties

PropertyValue

Silver

70 %

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Tungsten

30 %

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