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PtRh20 Alloy: Deformed Condition – Superior Corrosion & Thermal Resistance for High‑Stress Applications

The material PtRh20 (in the literature also Pt20Rh, Pt80Rh20 or PtRh80/20) is used for highly stressed laboratory equipment, catalysts, electrodes, glass fiber nozzles and lining materials, for crucibles, casings and stirrers in viscometry as well as for glass melting tanks. The mechanical, thermal and corrosive resistance increases with increasing rhodium content. An advantage of the platinum-rhodium alloy is that even in an oxidizing atmosphere only a minimum of weight loss occurs. The material is ductile, corrosion-resistant, oxidation-resistant and high temperature resistant. It is machinable, roll-cladable and conditionally deductible from the gas phase.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

18.7 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

240 GPa

Elongation

20.0 °C

2 %

Hardness, Vickers

20.0 °C

273 [-]

Poisson's ratio

23.0 °C

0.39 [-]

Typical for Platinum

Shear modulus

20.0 °C

86 GPa

Tensile strength

20.0 °C

940 MPa

Yield strength Rp0.2

20.0 °C

920 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

300.0 °C

1.04E-5 1/K

700.0 °C

1.09E-5 1/K

1200.0 °C

1.15E-5 1/K

Melting point

1769 °C

Typical for Platinum

Specific heat capacity

23.0 °C

136 J/(kg·K)

Typical for Platinum

Thermal conductivity

20.0 °C

28 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2.14E-7 Ω·m

Chemical properties

PropertyValue

Platinum

80 %

Rhodium

20 %


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