Tungsten
Tungsten is a refractory metal, a group that includes niobium, tantalum, molybdenum and rhenium, so-called because of their high melting temperatures and low vapor pressures. It is produced exclusively as a metal powder which is then solidified by sintering and/or melting. Tungsten is used, in wire form, extensively for lighting, electronic devices, and thermocouples. It’s high melting point makes it especially well-suited for structural applications exposed to very high temperatures.
TYPICAL PROPERTIES:
Physical Properties:
Crystal Structure: Body-centered cubic (α phase)
Atomic Weight: 183.85
Density: 19.254 g/cm3
Thermal Properties:
Boiling Point: 5900 oC (range of 5700 oC + 200 oC)
Melting Point: 3410 oC (+ 20 oC)
Thermal Conductivity (20 oC): 129 W/m ⋅K
Evaporation Heat: 444 J/g
Heat of Fusion: 209 J/g
Specific Heat: 0.14 J/g ⋅K
Electrical Properties:
Electrical Resistivity (20 oC): 5.5 µΩ/cm
Temperature Coefficient of the Electrical Resistivity: 482 ⋅10-5 Ω/ΩK
Temperature of Superconductivity: 0.016 K
Mechanical Properties:
Tensile Strength (20 oC): Sheet Thickness psi
0.5 - 1.0 mm >188,500
1.0 - 5.0 mm >116,000
Compressive Strength (20 oC): 166,753 psi
Modulus of Elasticity (20 oC): 59,450 ⋅103 psi
Transition Temperature (Brittle/Ductile): 100 oC - 400 oC