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Long-Term Stability Evaluation of a Sn-Doped Ni–C Eutectic Cell Suitable for Radiation Thermometry

  • R. N. TeixeiraEmail author
  • G. Machin
TEMPMEKO 2016
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

Metal carbon eutectic cells (high-temperature fixed points, HTFPs) (Machin in AIP Conf Proc 1552:305, 2013) are being considered for use as reliable high-temperature references for non-contact thermometry above the copper point (\(1084.62\,^{\circ }\hbox {C}\)). Recent studies have demonstrated the concept of using doped metal carbon eutectic cells as artefacts suitable for temperature scale comparisons (Teixeira et al. in AIP Conf Proc 1552:363, 2013; Teixeira et al. in Int J Thermophys 35:467–474, 2014; Machin et al. in Int J Thermophys 36:327–335, 2015). When using such artefacts, the participating institutes do not know the realization temperature of the doped HTFP cell, because it has been modified by the addition of a selected dopant at a definite concentration. The use of such fixed points can critically evaluate the real measurement capability of the institutes in any comparison. The pyrometry laboratory of Inmetro developed a set of doped Ni–C eutectic cells in 2012 and 2013. This paper describes the long-term stability of a Sn-doped Ni–C cell constructed in 2012, which accumulated more than 220 h above \(1300\,^{\circ }\hbox {C}\) amounting to more than 50 cycles of melts and freezes. The cell remained stable, well within the measurement uncertainty, throughout the evaluation period demonstrating the utility of such cells for scale comparison purposes.

Keywords

Eutectics Fixed points High temperatures Nickel Radiation thermometry 

Notes

Acknowledgements

R. T. would like to thank the technicians of the pyrometry laboratory of Inmetro for all the support during the measurements and also for the development of the dedicated software in charge of the determination of the point of inflection and calculation of melting temperature.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Instituto Nacional de MetrologiaQualidade e Tecnologia - InmetroRio de JaneiroBrazil
  2. 2.National Physical LaboratoryTeddingtonUK

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