PtW5 Cold-Formed Platinum‑Tungsten Alloys: High‑Performance Electrodes & Switch Contacts
The platinum-tungsten material PtW5, also Pt95W5 o Pt5W, for jewelery alloys Pt/W950 or Pt950/W50, is used as electrode material for spark plugs, as contact material for switch contacts (switches and relays for higher AC loads with long life like PtIr5, but for DC loads or AC loads with mains-synchronous switching instants). When switching DC circuits, PtW5 has the additional advantage of a small areal material migration from one to the other contact piece. They are particularly well-suited for switches and relays for DC loads or AC loads with line synchronous switching instants (currents in excess of 100mA at voltages greater than 12V) when long lifetimes are required. Another field of application for this material is the use as a potentiometer alloy. Furthermore, the material is used as platinum jewelry alloy for parts with high hardness, z. B. stamped rings, watch case use. The material is ductile, corrosion-resistant, oxidation-resistant up to 1100°C, 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 | 21.4 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 20.0 °C | 181 GPa | |
Hardness, Vickers | 20.0 °C | 300 [-] | |
Poisson's ratio | 23.0 °C | 0.39 [-] | Typical for Platinum |
Shear modulus | 23.0 °C | 62 GPa | Typical for Platinum |
Tensile strength | 20.0 °C | 950 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 300.0 °C | 8.9E-6 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 conductivity | 20.0 °C | 2.30E+6 S/m |
Electrical resistivity | 20.0 °C | 4.34E-7 Ω·m |
Chemical properties
| Property | Value |
|---|---|
Platinum | 95 % |
Tungsten | 5 % |
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