PtNi8.5 Soft-Annealed (+A): High-Performance Contact Material for Durable Switches and Relays

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	21 %
Hardness, Vickers	20.0 °C	210 [-]
Poisson's ratio	23.0 °C	0.39 [-]	Typical for Platinum
Shear modulus	20.0 °C	73 GPa
Tensile strength	20.0 °C	620 MPa
Yield strength Rp0.2	20.0 °C	460 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	2.7E-7 Ω·m

Chemical properties

Property	Value
Nickel	8.5 %
Platinum	91.5 %

PtNi8.5 Alloy: Durable Contact Material for AC/DC Switching PtRh10 Alloy: Superior Heat Resistance for Laboratory Equipment

Metal