Metallurgical studies carried out on samples of iridium versus iridium/40-percent rhodium thermocouples in condition received from manufacturer. Metallurgical studies included x-ray, macroscopic, resistance, and metallographic studies. Revealed large amount of internal stress caused by cold-working during manufacturing, and large number of segregations and inhomogeneities. Samples annealed in furnace at temperatures from 1,000 to 2,000 degree C for intervals up to 1 h to study effects of heat treatment. Wire annealed by this procedure found to be ductile.
Annealing Increases Stability Of Iridium Thermocouples
NASA Tech Briefs ; 13 , 4
1989-04-01
Miscellaneous
No indication
English
Engineering Index Backfile | 1941
|Long-term Stability Test of Type R Thermocouples
British Library Online Contents | 1995
|