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Reproducibility of WC–C High-Temperature Fixed Point

  • I. A. Grigoryeva
  • B. B. KhlevnoyEmail author
  • M. V. Solodilov
TEMPMEKO 2016
  • 98 Downloads
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

Reproducibility of the tungsten carbide–carbon peritectic (WC–C) fixed point (3021 K) was investigated by comparing six WC–C blackbody-type cells with each other. All the cells were built at VNIIOFI and had the same design with a cell outer diameter of 24 mm and a cavity opening diameter of 3  mm. Four cells were built using tungsten powder supplied by Alfa Aesar, while the other two cells used powder from Zhuzhou KETE (China). The nominal purity of both suppliers was 99.999 %. All the cells were compared in the same furnace. A reference cell in the second furnace was used for monitoring the stability of a radiation thermometer. Melting temperatures (given by the point of inflection) of all six cells agreed within ±45 mK. The reproducibility, as a standard deviation of the measured temperatures, can be estimated as 35 mK. The Zhuzhou KETE cells showed a slightly lower temperature than the Alfa Aesar cells: by 32 mK on average, which is comparable with repeatability of the measurements.

Keywords

High-temperature fixed point Reproducibility Tungsten carbide–carbon peritectic 

Notes

Acknowledgements

Authors thank Emma Woolliams for fruitful discussion and help in preparing this article. Funding was provided by Rosstandard.

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.All Russian Research Institute for Optical and Physical Measurements (VNIIOFI)MoscowRussia

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