1. Introduce
– It is a platinum group metal with a high melting point and very low corrosivity, so it is used as Ir metal itself or as an alloy with other platinum group metals
– It is the most non-corrosive of the metallic elements and has corrosion resistance to the extent that it does not dissolve in strong acids such as muriatic acid
– It reacts with sodium chloride, sodium cyanide (NaCN), etc. in the molten state, and also reacts with halogen elements (F₂, Cl₂) at high temperatures
– Effect of Ir alloying elements : corrosion resistance, high temperature wear resistance
2. Property
– Corrosion resistance, wear resistance, high temperature corrosion resistance, excellent heat resistance
[Ir Mechanical Properties]
| Tensile Strength (Mpa) | Elongation (%) |
|---|---|
| 550~1320 | 13~22 |
[Ir Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Electrical resistivity (µΩ∙㎝) | Specific Heat (J/kg∙℃) | Thermal Conductivity (W/mK) | Coefficient of Thermal Expansion (µm/m°C) |
|---|---|---|---|---|---|
| 22.65 | 2450 | 4.7 | 125~140 | 147 | 6.8 |
3. Application
– High temperature compound semiconductors, electrical contacts in spark plugs, chemical catalysts, phosphors in organic light emitting diodes, thermocouples, fountain pen nibs
(1) Electrical contacts in spark plugs / (2) Thermocouples / (3) Chemical catalysts / (4) Fountain pen nibs
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