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On the correction of the melting curve of the eutectic Co-C for the effect of the thermal inertia of the furnace.

Bloembergen, P*; Battuello, M*; Girard, F*; Machin, G; Wright, L (2016) On the correction of the melting curve of the eutectic Co-C for the effect of the thermal inertia of the furnace. Int. J. Thermophysics, 37 (4). p. 44.

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Abstract

This paper considers the influence of the thermal inertia of the furnace on the shape of the melting curve of the eutectic Co-C. To this end melting experiments have been performed in a uniform three-zone furnace, with an inherent substantial thermal inertia. The thermal inertia has been quantified by measuring the step-response of the furnace with the sample in its solid state, just below its melting temperature. It turns out that the shape of the curve, corrected for the effect of the thermal inertia of the furnace, differs considerably from that of the curve, as measured, in that the former shows a flatter melting plateau, and a larger curvature on the way down to the solidus point. As regards Tliq -of major interest in the characterization of the transition temperature of high-temperature fixed points-, it is demonstrated that the thermal inertia of the furnace shows a kind of self-compensating mechanism. Melting parameters, like the liquidus temperature Tliq, the effective distribution coefficient k , associated with the impurity content of the sample, and the eutectic temperature TE of the pure system, as derived, are compared for the corrected and the measured curve.

Item Type: Article
Keywords: Eutectics, Fixed points, Furnace, High temperatures, Melting, Thermal inertia
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-016-2048-y
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7046

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