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1887
Volume 65, Issue 4
  • ISSN: 2056-5135

Abstract

It is known that platinum-rhodium thermocouples exhibit mass loss when in the presence of oxygen at high temperatures due to the formation of volatile oxides of platinum and rhodium. The mass losses of platinum, Pt-6%Rh and Pt-30%Rh wires, commonly used for thermocouples, were considered in this paper to characterise the mass loss of wires of the three compositions due to formation and evaporation of the oxides PtO and RhO under the conditions that would be seen by thermocouples used at high temperature. For the tests, the wires were placed in thin alumina tubes to emulate the thermocouple format, and the measurements were performed in air at a temperature of 1324°C, i.e. with oxygen partial pressure of 21.3 kPa. It was found that the mass loss of the three wires increases linearly with elapsed time, consistent with other investigations, up to an elapsed time of about 150 h, but after that, a marked acceleration of the mass loss is observed. Remarkably, previous high precision studies have shown that a crossover after about 150 h at 1324°C is also observed in the thermoelectric drift of a wide range of platinum-rhodium thermocouples, and the current results are compared with those studies. The mass loss was greatest for Pt-30%Rh, followed by Pt6%Rh, then platinum.

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2021-01-01
2024-02-24
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References

  1. Nicholas J. V., and White D. R. “Traceable Temperatures: An Introduction to Temperature Measurement and Calibration”, John Wiley & Sons Ltd, Chichester, UK, 1994 [Google Scholar]
  2. Wu B., and Liu G. Platinum Metals Rev., 1997, 41, (2), 81 LINK https://www.technology.matthey.com/article/41/2/81-85/ [Google Scholar]
  3. Chaston J. C. Platinum Metals Rev., 1975, 19, (4), 135 LINK https://www.technology.matthey.com/article/19/4/135-140/ [Google Scholar]
  4. Rubel M., Pszonicka M., and Palczewska W. J. Mater. Sci., 1985, 20, (10), 3639 LINK https://doi.org/10.1007/bf01113771 [Google Scholar]
  5. Jehn H. J. Less Common Met., 1984, 100, 321 LINK https://doi.org/10.1016/0022-5088(84)90072-9 [Google Scholar]
  6. Edler F., and Ederer P. AIP Conf. Proc., 2013, 1552, (1), 532 LINK https://doi.org/10.1063/1.4819597 [Google Scholar]
  7. Knapton A. G. Platinum Metals Rev., 1979, 23, (1), 2 LINK https://www.technology.matthey.com/article/23/1/2-13/ [Google Scholar]
  8. Kinzie P. A. “Thermocouple Temperature Measurement”, John Wiley & Sons Inc, New York, USA, 1973, 278 pp [Google Scholar]
  9. Pearce J. V. Metrologia, 2020, 57, (2), 025009 LINK https://doi.org/10.1088/1681-7575/ab71b3 [Google Scholar]
  10. Phillips W. L. Am. Soc. Met.Trans. Q., 1964, 57, (1), 33 [Google Scholar]
  11. Crookes W. Proc. R. Soc. A: Math. Phys. Eng. Sci., 1912, 86, (589), 461 LINK https://doi.org/10.1098/rspa.1912.0040 [Google Scholar]
  12. Vasil’eva E. V., Zakharova M. I., and Lazarev E. M. Russ. J. Appl. Chem., 1974, 47, 1973 [Google Scholar]
  13. Tsirlip M. S., Krasilov B. I., Vladimirov V. B., and Byalobzheskin A. V. Zashch. Met., 1973, 9, 478 [Google Scholar]
  14. Joint Committee for Guides in Metrology, ‘Evaluation of Measurement Data – Guide to the Expression of Uncertainty in Measurement’, JCGM 100:2008, International Organization for Standardization, Geneva, Switzerland, 2008 LINK https://www.iso.org/sites/JCGM/GUM/JCGM100/C045315e-html/C045315e.html?csnumber=50461 [Google Scholar]
  15. Pearce J. V., Greenen A. D., Smith A., and Elliott C. J. Int. J. Thermophys., 2016, 38, (2), 26 LINK https://doi.org/10.1007/s10765-016-2159-5 [Google Scholar]
  16. Alcock C. B., and Hooper G. W. Proc. R. Soc. A Math. Phys. Eng. Sci., 1960, 254, (1279), 551 LINK https://doi.org/10.1098/rspa.1960.0040 [Google Scholar]
  17. Pearce J. V., Tucker D., Rawal R., and Hutton L. Meas. Sci. Technol., 2020, 31, (4), 044005 LINK https://doi.org/10.1088/1361-6501/ab48bd [Google Scholar]
  18. Webster E. S. Int. J. Thermophys., 2015, 36, (8), 1909 LINK https://doi.org/10.1007/s10765-015-1910-7 [Google Scholar]
  19. Bentley R. E. Int. J. Thermophys., 1985, 6, (1), 83 LINK https://doi.org/10.1007/bf00505793 [Google Scholar]
  20. Bentley R. E. “Theory and Practice of Thermoelectric Thermometry: Handbook of Temperature Measurement”, Vol. 3, Springer-Verlag Singapore Pte Ltd, Singapore, 1998 [Google Scholar]
  21. Jahan F., and Ballico M. Int. J. Thermophys., 2007, 28, (6), 1832 LINK https://doi.org/10.1007/s10765-007-0304-x [Google Scholar]
  22. Jahan F., and Ballico M. J. Int. J. Thermophys., 2010, 31, (8–9), 1544 LINK https://doi.org/10.1007/s10765-010-0797-6 [Google Scholar]
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