Thermocouples of the Refractory Metals

Abstract
The thermoelectric power of several refractory thermocouples was investigated, W-Ta for temperature measurements up to 3000°C, W-Mo up to 2600°C, Ta-Mo up to 2600°C and W-W/Mo (alloy 50 percent Mo/50 percent W) up to 2900°C. Basic calibration was carried out using several melting points and the results were verified and interpolated by means of an optical pyrometer. The couples W-Ta and W-Mo have been applied in this laboratory to the temperature measurement requirements in high temperature vacuum furnaces and determinations of spectral emissivity.

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