STATUS REPORT OF THE INVESTIGATION OF THERMOCOUPLE MATERIALS FOR USE AT TEMPERATURES ABOVE 4500°F 630361
Thermoelectric outputs of Re - 6W, Re - 9W, Re - 12W, Re - 15W, Re - 5Ru, Re - 10Ru, Re - 15Ru, Re - 10Rh, Re - 20Rh, Re - 10Pt, Re - 30Ir, Re - 5Mo, Re - 10 Os, Re - 20 Os, Mo - 10W, Mo - 20W, Mo - 10Re and Ir - 20Re versus commercial W - 26Re wire are shown. Re - 12W and Re - 15Ru are believed to be potentially the best of these materials.
The performance of BeO, ThO2 and HfO2 as thermocouple insulators is shown. BeO performs well to 4400°F but ThO2 and HfO2 should be used with care above 4100°F and 3900°F, respectively.
Ir - 15 Os, Ir - 20 Os and Ir - 10Re are shown to have promise for use as thermocouple sheath materials for temperatures to 4500°F in low pressure air for a limited time.