Iridium / Ir

  • General Designation: Iridium
  • Applications: crucibles, thermocouples, spark plug electrodes, probes
  • Product Forms: wire
  • Density (g/cm³): 22.56

Details

Material Behaviour
not ductile
Forming Process
hardly formable, limited machinability, hot formable

Observations¹
In contact with
Temperature (°C)
Medium
Condition
Corrosion
20 solid dry no measurable corrosion
20 solid moist no measurable corrosion
20 hydrogen sulphide H2S moist no measurable corrosion
20 hydrofluoric acid HF 40% no measurable corrosion
20 gaseous Cl2 moist no measurable corrosion
20 nitric acid HNO3 65% no measurable corrosion
20 sulphuric acid H2SO4 96% no measurable corrosion
20 aqua regia HNO3+HCl - no measurable corrosion
20 ethanol/iodine - no measurable corrosion
20 bromine water - no measurable corrosion
20 hydrochloric acid/chlorine 36% no measurable corrosion
20 dry Br2 moist no measurable corrosion
hydrobromic acid/bromine HBr/Br2 60% no measurable corrosion
20 hydrofluoric acid HF 40% no measurable corrosion
hydro-iodic acid HI 57% no measurable corrosion
20 dry Br2 dry no measurable corrosion
20 gaseous Cl2 dry no measurable corrosion
100 hydrochloric acid/chlorine 20%/ saturated light corrosive attack
100 sodium hypochlorite NaClO - light corrosive attack
100 mercury chloride HgCl2 - no measurable corrosion
100 aluminium sulphate Al2(SO4)3 - no measurable corrosion
100 orthophosphoric acid - no measurable corrosion
100 copper sulphate - no measurable corrosion
100 hydrobromic acid HBr 60% no measurable corrosion
98 nitric acid HNO3 65% no measurable corrosion
100 hydrochloric acid/chlorine 36% no measurable corrosion
100 sulphuric acid H2SO4 96% no measurable corrosion
100 aqua regia HNO3+HCl - no measurable corrosion
100 acetic acid 99%
100 phosphoric acid - no measurable corrosion
100 hydro-iodic acid HI 57% no measurable corrosion
150 aqua regia HNO3+HCl - relatively severe attack
440 potassium bisulphate KHSO4 air access no measurable corrosion
550 molten NaCN/KCN (2:1) air access relatively severe attack
700 not known air access relatively severe attack
700 molten NaCN air access relatively severe attack
Corrosion Resistant
see Table
Comment
oxidation resistant to 800°C
Sources Chemical
¹ Edelmetall-Taschenbuch, ISBN 3-7785-2448-8

IACS Min. (%) [100% IACS ≙ 58 S*m/mm²]
35.1
Thermo-emf. vs. copper Hard (mV)
-0.1
Temperature coefficient of electric resistivity
From Temperature (°C)
To Temperature (°C)
Hard (x10-4/K)
Annealed (x10-4/K)
0 100 43

Young's Modulus (GPa)
528
Young's Modulus - HT¹
Modulus of Rigidity (GPa)
210
Poission's ratio
0.39
Annealed
Hardness (HV)
Tensile strength (MPa)
Yield strength (MPa)
Elongation (%)
210 450 93 7
Work hardened
Hardness (HV)
Tensile Strength (MPa)
Yield Strength (MPa)
Elongation (%)
453 1632 1618 1
Property Range
Hardness (HV)
Tensile Strength (MPa)
Yield Strength (MPa)
Elongation (%)
210 - 453 450 - 1632 93 - 1618 1 - 7

Melting Range
From Temperature (°C)
To Temperature (°C)
2447
Thermal conductivity (W /(m*K)) [RT]
59
Linear Coefficient of Expansion³
From Temperature (°C)
To Temperature (°C)
Coefficient (x10-6/K)
20 100 6.7
20 300 7.1
20 900 7.8
20 1000 7.9
20 1100 8
20 1200 8.1
20 1300 8.2
20 1400 8.4
20 1500 8.5
20 1600 9.2

Disclaimer

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