Platinum/Iridium Alloy Spooled Wire (Pt90/Ir10)

Platinum/Iridium Alloy Spooled Wire (Pt90/Ir10) combines the high corrosion resistance and conductivity of platinum with the hardening and arc erosion resistance conferred by iridium. This formulation excels in applications requiring stable performance under prolonged thermal stress, exposure to reactive environments, or frequent electrical cycling. It is a preferred material for neural stimulation electrodes, aerospace electrical contacts, and high-reliability ignition systems. Recent work in nanostructured Pt90Ir10 coatings for neural electrodes has shown improved impedance control and biocompatibility, enhancing signal fidelity in implantable systems. The alloy’s resistance to contact welding, dimensional distortion, and oxidation is further enhanced through nanoparticle coating technologies and alloying with refractory metals like Nb and Mo. This balance of strength, stability, and conductivity ensures the alloy’s utility in ultra-reliable microelectronic assemblies, vacuum switches, and catalytic microsystems, sustaining its relevance across cutting-edge scientific and industrial domains.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Wire

Diameter		±10%
Length		+5% / -1%

Material Properties for Precious Metals

Mechanical Properties

Element	Value
Hardness - Brinell	130-190
Elongation at break( % )	<25
Tensile strength( MPa )	380-620

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	25
Temperature coefficient( K⁻¹ )	0.0013

Thermal Properties

Element	Value
Melting point( C )	1800
Thermal conductivity( W m⁻¹ K⁻¹ )	31@23
Thermal conductivity( W m⁻¹ K⁻¹ )	31@23C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	8.7@20-100°C