Jan 7 2004
Background
Platinum / Iridium Pt 90 / Ir 10 alloy has been used in “non-standard” thermocouples, electrical contacts and for electrodes in medical research. The alloy is harder and mechanically stronger than Platinum.
Key Properties
The key properties of Platinum / Iridium Pt 90 / Ir 10 alloy are tabulated below.
Table 1. Key properties
| Electrical Properties |
| Temperature coefficient ( K-1 ) |
0.0013 |
| Electrical resistivity ( µOhm.cm ) |
25 |
| Mechanical Properties |
| Elongation at break ( % ) |
<25 |
| Hardness - Brinell |
130-190 |
| Tensile strength ( MPa ) |
380-620 |
| Physical Properties |
| Density ( g.cm-3 ) |
21.56 |
| Melting point (°C ) |
1800 |
| Thermal Properties |
| Coefficient of thermal expansion ( x10-6 K-1 ) |
8.7 @ 20-100 °C |
| Thermal conductivity ( W.m-1.K-1 ) |
31 @ 23 °C |
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