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Rhenium: The Ultra‑High‑Density Metal for Filaments and Refractory Applications

Among the highest density element and melting point, rhenium does not have a ductile to brittle transition temperature and does not form carbides. With high resistivity, combined with low vapor pressure, it is an ideal material for filament applications. Excellent resistance to corrosion, resists acid attack and the mechanical effects of electrical erosion. Rhenium has a beneficial effect as an alloying addition with other refractory metals as it greatly enhances the ductility and tensile strength of these alloys.

Properties

General

PropertyTemperatureValue

Density

23.0 °C

21.2 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

23.0 °C

483 GPa

Elongation

23.0 °C

2 %

in 1 in.

Tensile strength

20.0 °C

1380 MPa

500.0 °C

930 MPa

1000.0 °C

480 MPa

Thermal

PropertyTemperatureValue

Coefficient of thermal expansion

23.0 °C

6.8E-6 1/K

Melting point

3180 °C

Specific heat capacity

23.0 °C

138 J/(kg·K)

Thermal conductivity

23.0 °C

48 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

1.35E-7 Ω·m

Chemical properties

PropertyValueComment

Rhenium

99.97 %

min

Technological properties

Property
Application areas

Common applications of Rhenium: Mass spectrometer filaments, grid heaters, cathode cups, nuclear reactors, thermocouples


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