PtNi8.5 Alloy: Durable Contact Material for AC/DC Switching
The platinum-nickel material PtNi8.5, also Pt91.5Ni8.5 or 91.5Pt8.5Ni or Pt/Ni91.5/8.5, is used as contact material for switching contacts (switches and relays for higher alternating current loads with long service life as with PtIr5 , but for DC loads or AC loads with mains-synchronous switching instants) as well as for straps use. When switching DC circuits, PtNi8.5 has the additional advantage of a small areal material creeping from one contact to another. They are particularly well suited for currents above 100 mA at voltages greater than 12 V when long lifetimes are required. The material is ductile, corrosion-resistant, abrasion-resistant and erosion-resistant. It is machinable, roll-cladable and conditionally deductible from the gas phase.
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 20.0 °C | 19.2 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 20.0 °C | 184 GPa | |
Elongation | 20.0 °C | 2 % | |
Hardness, Vickers | 20.0 °C | 360 [-] | |
Poisson's ratio | 23.0 °C | 0.39 [-] | Typical for Platinum |
Shear modulus | 20.0 °C | 73 GPa | |
Tensile strength | 20.0 °C | 1270 MPa | |
Yield strength Rp0.2 | 20.0 °C | 920 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 300.0 °C | 1.04E-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 | 23.0 °C | 69 - 73 W/(m·K) | Typical for Platinum |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 20.0 °C | 2.79E-7 Ω·m |
Chemical properties
| Property | Value |
|---|---|
Nickel | 8.5 % |
Platinum | 91.5 % |
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