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The influence of highly refractory oxides on the thermo-electromotive force of tungsten, molybdenum and tantalum in vacuum at 1500°C

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Conclusions

Oxides of beryllium, aluminum, and magnesium practically do not affect the change in thermo-emf of tungsten. Zirconia interacts with tungsten at 1500°C, which leads to a change in its original emf.

The thermo-emf of molybdenum does not alter during heating with magnesia, alumina, and zirconia. Beryllia slightly affects the change in thermo-emf of molybdenum.

The magnitude and nature of the change in thermo-emf of tungsten and molybdenum during heating in MgO are identical. The readings from tungsten-molybdenum thermocouples are constant.

The thermo-emf of tantalum is greatly changed compared with the original value during heating in powdered Al2O3, BeO, MgO, and ZrO2, which hinders its use for thermocouples.

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Authors
  1. V. I. Ivanov
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  2. G. E. Pletenetskii
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  3. E. P. Nechiporenko
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Ivanov, V.I., Pletenetskii, G.E. & Nechiporenko, E.P. The influence of highly refractory oxides on the thermo-electromotive force of tungsten, molybdenum and tantalum in vacuum at 1500°C. Refractories 4, 357–361 (1963). https://doi.org/10.1007/BF01285121

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  • DOI: https://doi.org/10.1007/BF01285121

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