Platinum Dispersion Hardened (Pt DPH)

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Description

Pt DPH is an oxide dispersion hardened grade of pure platinum which is used in high temperature applications when the use of solid solution hardening by alloying elements such as rhodium, iridium or gold cannot be tolerated.

This material data has been provided by Heraeus.

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

23.0 °C

21.36 g/cm³

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Mechanical

PropertyTemperatureValueComment

Creep strength

1200.0 °C

3.3 MPa

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10,000 h (extrapolated data)

1400.0 °C

2.5 MPa

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10,000 h (extrapolated data)

1600.0 °C

1.3 MPa

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10,000 h (extrapolated data)

Elastic modulus

23.0 °C

37.6 GPa

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Elongation

20.0 °C

22 %

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1200.0 °C

68 %

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1400.0 °C

53 %

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1600.0 °C

45 %

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Hardness, Vickers

23.0 °C

60 [-]

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Norton Exponent

1200.0 °C

8.5 [-]

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1400.0 °C

8.3 [-]

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1600.0 °C

7 [-]

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Tensile strength

20.0 °C

178 MPa

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1200.0 °C

25 MPa

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1400.0 °C

15.6 MPa

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1600.0 °C

10.4 MPa

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Yield strength Rp0.2

20.0 °C

73 MPa

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1200.0 °C

18.5 MPa

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1400.0 °C

13.6 MPa

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1600.0 °C

9.8 MPa

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Thermal

PropertyTemperatureValue

Melting point

1769 °C

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Thermal conductivity

20.0 °C

71.5 W/(m·K)

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1200.0 °C

84.2 W/(m·K)

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1400.0 °C

85 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.2E-7 Ω·m

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1200.0 °C

5.9E-7 Ω·m

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1400.0 °C

5.9E-7 Ω·m

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Technological properties

Property
Application areas

Typical applications are crucibles and other equipment for processing special optical glasses, as the alloying elements can cause an unacceptable discoloration of the glass. For similar reasons, crucibles of Pt DPH are used in the manufacture of many single crystals by the Czochralski and Bridgman processes. Particularly in periods of high rhodium prices, Pt DPH is also used as a lining for refractory components. In this case, the refractory takes on the main load-bearing function. A further application is in thermocouple thimbles for use in glass melts containing sulphur. The sulphur in the glass can react with rhodium in Pt-Rh alloys leading to the formation of a eutectic that melts at 925°C, thus destroying the thimble. In contrast, thimbles of Pt DPH can be used in similar environments at temperatures exceeding 1200°C.