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An international study of the long-term stability of metal-carbon eutectic cells.

Sadli, M*; Bloembergen, P*; Khlevnoy, B*; Wang, T*; Yamada, Y*; Machin, G (2011) An international study of the long-term stability of metal-carbon eutectic cells. Int. J. Thermophysics, 32 (7-8). pp. 1786-1799.

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For high temperature fixed points to be accepted as temperature references it is important that their long-term stability be objectively demonstrated. This evaluation is part of the CCT-WG5 high temperature research project [1] devoted to the comprehensive evaluation of three high-temperature fixed points Co-C (1324 °C), Pt-C (1738 °C) and Re-C (2474 °C). The assessment of the long-term stability as well as the robustness of the cells is examined in the first workpackage.

Four cells for each of the eutectic points have been constructed by NMIJ (4 Co-C, 2 Pt-C and 4 Re-C) and NPL (2 Pt-C) and the stability tests have been performed by NMIJ (Co-C), NIM (Pt-C) and VNIIOFI (Re-C). These tests consisted of the aging of one cell, among the set of four, for a period of 50 hours around the melting temperature. For each of the three eutectic points, before and after aging, the tested cell was compared to one of the three cells so that the drift, due to the aging if any, can be evaluated. All three cells which underwent the aging process showed no breakage and demonstrated extremely repeatable melting plateaus.

In this paper, after a short description of the protocol and the cells (described more completely elsewhere [2]), the results of the aging tests obtained for the three fixed points are presented and discussed.

[1] Machin, G., Bloembergen, P., Hartmann, J., Sadli, M., Yamada Y., ¿A concerted international project to establish high temperature fixed-points for primary thermometry¿, Int. J. Thermophys., 28, 1976-1982, 2007

[2] Sadli M. , Yamada Y. , Wang T. , Yoon H.W. , Bloembergen P., Machin G. 'Stability and robustness tests on Co-C, Pt-C and Re-C cells: the first results' Tempbeijing, 20th-23rd October 2008.

Item Type: Article
Keywords: High temperature fixed points, eutectic cells
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-011-1009-8
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5215

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