PtAu5 soft annealed (+A)

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Description

The platinum-gold material PtAu5 (in the literature also Pt5Au, Pt95Au5, PtAu 95/5, etc.) is used for laboratory crucibles for melt digestion of minerals and ferroalloys, and for laboratory shells in X-ray fluorescence analysis also in fine grain stabilized state. Further use for crucibles, casings and stirrers in viscometry. The gold content reduces the wettability against glass melts, so that they can easily be dissolved out after solidification without residues. In addition, the mechanical strengthening is increased and the recrystallization tendency is reduced. Alloys up to 5% gold have been developed to enhance the mechanical resistance and dimensional stability of platinum laboratory equipment without compromising their chemical resistance. Even at 1000°C, such materials are twice as strong as unalloyed platinum. In addition, they have an extremely constant weight and they are only slightly wetted by silicate melts. Therefore, they are often used for crucibles and casings in preparation work in the X-ray fluorescence analytical laboratory.

Related Standards

This material data has been provided by WIAM.

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

21.32 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

180 - 183 GPa

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Elongation

20.0 °C

7 - 8 %

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Hardness, Vickers

20.0 °C

135 - 139 [-]

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Poisson's ratio

23.0 °C

0.39 [-]

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Typical for Platinum

Shear modulus

23.0 °C

62 GPa

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Typical for Platinum

Tensile strength

20.0 °C

460 MPa

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Yield strength

20.0 °C

370 MPa

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Yield strength Rp0.2

20.0 °C

370 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

23.0 °C

8.8E-6 - 9.1E-6 1/K

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Typical for Platinum

Melting point

1769 °C

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Typical for Platinum

Specific heat capacity

23.0 °C

136 J/(kg·K)

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Typical for Platinum

Thermal conductivity

20.0 °C

43 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.8E-7 Ω·m

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Chemical properties

PropertyValue

Gold

5 %

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Platinum

95 %

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