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Infiltrated ASTM B631 Class C Silver-Tungsten Alloy

Infiltrated ASTM B631 class C is a type of ASTM B631 class C. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. The graph bars on the material properties cards below compare infiltrated ASTM B631 class C to: precious metal electrical contact alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

180 GPa 26 x 106 psi

Flexural Strength

560 MPa 81 x 103 psi

Poisson's Ratio

0.32

Rockwell B Hardness

55

Shear Modulus

66 GPa 9.6 x 106 psi

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Thermal Properties

Latent Heat of Fusion

140 J/g

Specific Heat Capacity

180 J/kg-K 0.044 BTU/lb-°F

Thermal Conductivity

450 W/m-K 260 BTU/h-ft-°F

Thermal Expansion

14 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

63 % IACS

Electrical Conductivity: Equal Weight (Specific)

43 % IACS

Otherwise Unclassified Properties

Density

13 g/cm3 830 lb/ft3

Embodied Carbon

59 kg CO2/kg material

Embodied Energy

920 MJ/kg 390 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

5.0 points

Strength to Weight: Bending

6.5 points

Thermal Diffusivity

180 mm2/s

Thermal Shock Resistance

6.8 points

Alloy Composition

Tungsten (W)W 46.6 to 53
Silver (Ag)Ag 47 to 51
Cobalt (Co)Co 0 to 1.0
Carbon (C)C 0 to 0.2
Copper (Cu)Cu 0 to 0.2
Residualsres. 0 to 1.0

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B631: Standard Specification for Silver-Tungsten Electrical Contact Materials

Tungsten: Properties, Chemistry, Technology of the Element, Alloys, and Chemical Compounds, Erik Lassner and Wolf-Dieter Schubert, 1999