Platinum Iridium Wire is a platinum-iridium alloy product. VTG Material is a global supplier and manufacturer of high-quality platinum-iridium alloy products such as
Platinum Iridium Wire is a platinum-iridium alloy product. The Platinum Iridium Wire is widely used in the fabrication of metal microelectrodes for electrical stimulation of nervous tissue and electrophysiological recordings.
Pt/Ir alloy has an optimal combination of mechanical and electrochemical properties for this application. Pure iridium is very difficult to pull into small diameter wires; at the same time, platinum has a low Young’s modulus which makes pure platinum wires bend too easily during insertion into nervous tissue.
Application
Owing to its high resistance to corrosion and good ductility, Platinum Iridium Wire has seen numerous applications in the field of electrical contact. The high hardness and low contact resistance of the 10 and 20 percent iridium alloys make them particularly suitable for low current, low-pressure applications where dust contamination prejudices the performance of softer materials.
In medium current applications when resistance to hammering becomes important alloys containing up to 20 percent of iridium are sometimes employed. A recent study showed that material transfer from the cathode was proportional to the number of coulombs passed through the arc and decreased steadily with iridium contents up to 35 percent (30). Pfann (31) has shown that interesting results can be achieved by pairing a negative 20 percent iridium-platinum contact with a positive contact of pure gold.
With medium currents the material transfer caused by an asymmetrical molten bridge was found to balance the other transfer processes, thus minimizing contact wear. Precision resistors and slide wire potentiometers utilize considerable quantities of 10 and 20 percent iridium-platinum wire. The combination of moderate resistivity, low-temperature coefficient, and high corrosion resistance exhibited by these alloys is of great value in the construction of high-quality transducers.
In the temperature measurement field, we find the 10 percent iridium platinum alloy used in combination with a 40 percent palladium-gold wire. This thermocouple, capable of generating 34 millivolts at 6oo, has wide applications at moderately high temperatures.
The bridge wires used in electric detonators fuses, and cartridge igniters must be very strong and resistant to corrosion, and iridium platinum alloys have long been preferred for such applications. Needles used for the initial perforation of diamond dies by electrosparking are sometimes made from the 20 percent iridium alloy
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